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Comtech EF Data Vipersat CDD-562L User Manual

Satellite network demodulator router, vipersat cdd-56x series
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Comtech EF Data is an
AS9100 Rev B / ISO9001:2000 Registered Company
Vipersat
CDD-56X Series
Satellite Network Demodulator Router
User Guide
CDD-562L
CDD-564/564L
MN/22137 Revision 1

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  • Page 1 Comtech EF Data is an AS9100 Rev B / ISO9001:2000 Registered Company Vipersat CDD-56X Series Satellite Network Demodulator Router User Guide CDD-562L CDD-564/564L MN/22137 Revision 1...

  • Page 3: User Guide

    Vipersat CDD-56X Series CDD-562L, CDD-564/564L Satellite Network Demodulator Router User Guide Part number MN/22137 Document Revision 1 Firmware Version 1.6.11/2.6.11 April 21, 2013...
  • Page 4 Revision: 1 Firmware Version: 1.6.11/2.6.11 ©2013 by Comtech EF Data, Inc. All rights reserved. No part of this manual may be copied or reproduced without prior written permission of Comtech EF Data, Inc. IMPORTANT NOTE: The information contained in this document supersedes all previously published information regarding this product.

  • Page 5: Document Revision History

    Document Revision History Revision Date Description 3/10/08 Initial Release Note: This new document part number, MN/22137, supersedes the previous CDD-56X User Guide part number, 22137. New functionality in v1.5.4: New DPC enhancements; STDMA Power Hunt; Hitless Switching; New VMS registration and Managing Address method;...
  • Page 6 { This Page is Intentionally Blank }...

  • Page 7: Table Of Contents

    Table of Contents Chapter 1 Set the IP Address ... 2-6 Configure the Route Table ..2-7 General Routing in a Vipersat Network..2-7 How to Use This Manual .

  • Page 8: General

    MN/22137, rev 1 Slot Guardband ... . 3-17 Dynamic Power Control Configuration . . 3-44 Slot Preamble Length ..3-18 DPC Enabled ... . . 3-46 Slot Data Length .
  • Page 9 MN/22137, rev 1 Bandwidth Allocation and Load Switching by Calibrated Data Rate ..C-13 the Hub STDMA Burst Controller . . .B-5 DPC Margin ... . . C-13 Load Switching—STDMA Hub .
  • Page 10 MN/22137, rev 1 { This Page is Intentionally Blank } Vipersat CDD-56X Series User Guide...

  • Page 11: List Of Figures

    List of Figures Chapter 2 Figures Hub) ......3-24 Figure 3-27 GIR Remote Policies prompt ..3-25 Figure 3-28 Entry Channel Switch Rates screen .
  • Page 12 MN/22137, rev 1 Figure 3-62 Home State Configuration screen3-48 Figure B-11 Per Type ToS Switching Example . . Figure 3-63 Force Modem to Home State warning B-22 3-49 Figure B-12 ToS Remarking Application . . . B-23 Figure 3-64 Receive Frequency prompt ..3-49 Figure B-13 ToS and DSCP Conversion Chart .

  • Page 13: List Of Tables

    List of Tables Chapter 2 Tables Table 2-1 CDD-56X Network Roles and Functions Table 2-2 Vipersat Feature Configuration ..2-6 Appendix B Tables Table B-1 STDMA ACK Message ..B-6 Table B-2 ToS Switching Settings .
  • Page 14 MN/22137, rev 1 { This Page is Intentionally Blank } Vipersat CDD-56X Series User Guide viii...

  • Page 15: How To Use This Manual

    How to Use This Manual This manual documents the enhanced Vipersat features and functions of the CDD-56X Series (CDD-562L, CDD-564, and CDD-564L) of Satellite Network Demodulator Routers, and guides the user in how to configure these products for use in a Vipersat network. The material covered addresses only those areas...

  • Page 16: Chapter 3 - Using The Command Line

    H o w t o U s e T h i s Ma n u a l MN/22137, rev 1 Chapter 3 — Using the Command Line Interface (CLI) Describes the use of the CLI for configuring and monitoring the CDD-56X in a Vipersat network.
  • Page 17 MN/22137, rev 1 H o w t o U s e T h i s M a n u al Caution: Explanatory text that notifies the reader of possible consequences of an action. Warning: Explanatory text that notifies the reader of potential harm as the result of an action.

  • Page 18: Product Description

    The CDD-564 and CDD-564L provide four separate demodulators (the CDD-562L provides two) and an integrated router in a compact, cost-effective 1RU package. The CDD-56X simplifies Hub site installations by reducing rack space and cost with 2/4 independent demodulators in a single chassis.

  • Page 19: Network And Bandwidth Management

    MN/22137, rev 1 P r o d u c t D e s c r i p t io n • Single Hop On Demand (SHOD) functions • 10/100BaseT Ethernet LAN/WAN Interface • Static IP Routing for Unicast or Multicast •...

  • Page 20: Stdma

    P r o d u c t D e s c r i p t i o n MN/22137, rev 1 STDMA The addition of STDMA capability to a Vipersat network allows multiple termi- nals to share the same satellite resources that would be dedicated to a single terminal in an SCPC configuration.

  • Page 21: Payload Decompression

    MN/22137, rev 1 P r o d u c t D e s c r i p t io n Payload Decompression Payload compression condenses the size of data frames and reduces the satellite bandwidth required to transmit across the link. Configurable on a per route basis, Payload Compression provides traffic optimization and reduces band- width up to 40%.

  • Page 22: Customer Support

    C u s t o m e r S up p o r t MN/22137, rev 1 Customer Support Contact Information Contact Comtech Vipersat Networks Customer Support for information or assistance with product support, service, or training on any Vipersat product. Mail: 3215 Skyway Court Fremont, CA 94539...

  • Page 23: Quick Start Configuration

    H A P T E R UICK TART ONFIGURATION Introduction This chapter describes the minimum configuration of a Vipersat CDD-56X Series Demodulator Router that is necessary in order for the equipment to func- tion in a Vipersat network. The Vipersat CDD-56X Demodulator Router stores its configuration in an ASCII file named the PARAM file.

  • Page 24: Initial Configuration

    I n i t i a l C o n f i gu r a t i o n MN/22137, rev 1 Initial Configuration Note: Many of the settings required for equipment configuration are based on NOTE the LAN/WAN and Satellite network design, and should be obtained from the network administrator.

  • Page 25: Setting Vipersat Cdd-56X Operating Parameters

    MN/22137, rev 1 I n i t i a l C o n f i g u r a t io n Table 2-1 CDD-56X Network Roles and Functions Demod Role / Location Expansion STDMA SCPC SCPC SCPC SCPC SCPC SCPC SCPC Remote...

  • Page 26: Figure 2-1 Main Menu Screen

    I n i t i a l C o n f i gu r a t i o n MN/22137, rev 1 Figure 2-1 Main Menu screen From the Administration screen shown in figure 2-2, select the Features Configuration command by entering F at the command prompt. Figure 2-2 Administration screen From the Feature Configuration menu shown in figure 2-3, verify...
  • Page 27 MN/22137, rev 1 I n i t i a l C o n f i g u r a t io n Figure 2-3 Feature Configuration screen To enter the feature code, enter Y at the command prompt, then enter the 20 digit FAST Feature Code, as shown in figure 2-4.

  • Page 28: Set The Ip Address

    I n i t i a l C o n f i gu r a t i o n MN/22137, rev 1 Figure 2-5 Working Mode dialog When the reboot is completed, return to the Feature Configuration menu and configure the settings for Vipersat STDMA and Auto Switching according to the table below.

  • Page 29: Configure The Route Table

    MN/22137, rev 1 I n i t i a l C o n f i g u r a t io n Figure 2-6 Ethernet Interface screen Save the settings to flash by entering S at the command prompt. Configure the Route Table Routing in a Vipersat Network CDD-56X Demodulator Routers operating in Vipersat mode do not use the small or large network described in the CDD-564L Installation and Operation...

  • Page 30: Creating The Routes

    I n i t i a l C o n f i gu r a t i o n MN/22137, rev 1 By putting the one route statement “Remotes 172.16.128.0/17 Wan to Sat” in the TDM Hub modem, and by using the route statement “GW 0.0.0.0/0 Wan to Sat”...

  • Page 31: Set The Satellite Demod Configuration

    MN/22137, rev 1 I n i t i a l C o n f i g u r a t io n Figure 2-7 Configuring the Route Table screen Enter S at the command prompt in figure 2-7 to save the settings to flash. Set the Satellite Demod Configuration Enter M from the Main Menu, then enter C from the Satellite Demodulator menu to access the Configuration screen.

  • Page 32: Set The Vipersat Configuration

    I n i t i a l C o n f i gu r a t i o n MN/22137, rev 1 Figure 2-8 Rx Configuration screen Save the settings to flash by entering S at the command prompt. Set the Vipersat Configuration Enter V at the Main Menu command prompt (figure 2-1) to select the Vipersat Configuration menu shown in figure 2-9.
  • Page 33 MN/22137, rev 1 I n i t i a l C o n f i g u r a t io n Enter R at the command prompt to toggle the Unit Role to either Hub or Remote. This parameter will determine the role the target CDD-56X will perform in the network and what type of commands and functions it will receive from the VMS.
  • Page 34 I n i t i a l C o n f i gu r a t i o n MN/22137, rev 1 Refer to Chapter 3, “Using the Command Line Interface (CLI)”, for additional details on configuring the target Vipersat CDD-56X. V i p e r s a t C D D - 5 6 X S e r i e s U s e r G u i d e 2-12...

  • Page 35: Using The Command Line Interface

    H A P T E R SING THE OMMAND NTERFACE (CLI) General This chapter describes the use of the CLI for configuring and monitoring the CDD-56X Demodulator/Router in a Vipersat network. Each CLI screen related to a CDD-56X operating in Vipersat mode is presented, along with a detailed description of the available commands.

  • Page 36: Common Screen Commands

    Some feature configurations apply to the CDD-56X as a unit, others are set on a per Demod basis. This command (enter Z) allows the selection of one of the two (CDD-562L) or four (CDD-564/564L) Demodulators. Save Parameters to Permanent Storage To Save the current parameter settings to permanent storage, enter S at the command prompt.

  • Page 37: Menu Descriptions

    MN/22137, rev 1 M e n u D e sc r i p t i o n s Menu Descriptions This section details the CLI menus and associated screens, and briefly discusses the function of each of the commands available on each menu. Main Menu The Main Menu, shown in figure 3-1, allows configuring both the Demodula- tor and Router functions of the target CDD-56X.

  • Page 38: Figure 3-2 Administration Screen

    M en u D e sc r i p t i o n s MN/22137, rev 1 Figure 3-2 Administration screen Ensure that the Working Mode is set to Router-Vipersat. If it is not, enter C at the command prompt and change the setting by selecting 4, as shown in figure 3-3.

  • Page 39: Feature Configuration

    MN/22137, rev 1 M e n u D e sc r i p t i o n s Feature Configuration Figure 3-4 Feature Configuration screen The Feature Configuration screen shown in figure 3-4 allows the Enabling and Disabling of the major Vipersat CDD-56X features. Use this screen to enable and disable Vipersat features such as: •...

  • Page 40: Vipersat Management

    M en u D e sc r i p t i o n s MN/22137, rev 1 Figure 3-5 FAST Feature Code dialog Tip: Contact either the network administrator or Comtech Vipersat Networks Customer Support to obtain the Feature codes. A convenient option is to use the Vipersat Vload utility to manage Feature codes.

  • Page 41: Vipersat File Streamer

    MN/22137, rev 1 M e n u D e sc r i p t i o n s To activate the Vipersat Auto Switching capabilities of the target CDD-56X, toggle the Auto Switching command to Enabled by entering W at the command prompt.

  • Page 42: Vipersat Configuration

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Vipersat Configuration Entering V at the prompt from the CDD-56X Main Menu shown in figure 3-1 displays the Vipersat Configuration menu shown in figure 3-6. Figure 3-6 Vipersat Configuration screen (Hub) This menu lists the available commands for configuring a Vipersat CDD-56X.

  • Page 43: Stdma

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Figure 3-7 STDMA screen (Hub, STDMA, Fixed type) Figure 3-8 STDMA screen (Hub/Remote, SCPC) STDMA This menu item is read-only and shows the current state of STDMA in the CDD-56X.

  • Page 44: Stdma Tx Rate

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 STDMA Tx Rate This menu item shows the STDMA Transmit Rate (in bps) of data that the CDD-56X receives. This item is read-only and cannot be modified in this menu. Hub Type This menu item is only displayed if the CDD-56X is being used as a Hub in the network, and provides the functionality for the STDMA Burst Controller.

  • Page 45: Fixed

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Refer to Appendix B, “Automatic Switching”, for additional information on how each of the bandwidth allocation modes functions and the parameters used to calculate the commands for each mode.

  • Page 46: Entry Channel

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Note: GIR allocations are restricted so that assigned GIR totals cannot exceed the available bandwidth. This ensures proper bandwidth allocation when NOTE the network is overloaded.

  • Page 47: Ecmv2 Mode

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n mitting back to the Hub. The Remotes transmit on a contention basis and should a collision occur, the Remote will back off for a specified period and try again. Once it obtains one of the available slots, the Remote will hold onto the slot until it registers with the VMS and receives assignment into dSCPC, or until all necessary transactions are completed.

  • Page 48: Group Id

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Group ID The STDMA Group ID number defines a group of equipment (including CDD-56X Hub and Remote units) that will respond to the output of a single STDMA burst controller.

  • Page 49: Low Data Rate Fast Acquisition

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n This feature option is Enabled/Disabled by entering H at the command prompt. Figure 3-12 STDMA Max Power Hunt prompt Low Data Rate Fast Acquisition Configurable on a Hub Burst Controller only.

  • Page 50: Outbound Ip

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Figure 3-13 Burstmap Multicast IP prompt Outbound IP This menu item, which appears for all Hub configurations, displays the current Outbound IP address.

  • Page 51: Slot Guardband

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n For Dynamic Cycle and GIR configurations, the number of cycles is automati- cally set to one in order to ensure optimum performance for these Hub types. This parameter can be modified by entering a C at the command prompt to display the dialog shown in figure 3-15.

  • Page 52: Slot Preamble Length

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 CDD-56X based on the STDMA transmit bit rate as shown in the menu in figure 3-7. Slot Preamble Length This menu item, which appears in all Hub and Remote configurations, displays the current Slot Preamble size in milliseconds and bytes for the remotes in the group.

  • Page 53: Nominal Data Length

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Figure 3-18 Slot Data Length prompt Nominal Data Length This menu item, which appears for Dynamic Slot Hub type, displays the Nomi- nal slot Data Length in milliseconds and bytes for the remotes in the group, and represents the approximate amount of data that can be transmitted or received in one spin of the STDMA cycle by each of the remotes belonging to...

  • Page 54: Minimum Data Length

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 To change this setting, enter B at the command prompt to display the dialog shown in figure 3-20. Figure 3-20 Maximum Data Length prompt Minimum Data Length This menu item, which appears for Dynamic Slot, Dynamic Cycle, GIR, and...

  • Page 55: Slot Cycle Length

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n This parameter defines the number of time slots per cycle available for assign- ment to the Remotes in queue that are to be switched from ECM into dSCPC. These are the Remotes that are tagged for Online mode.

  • Page 56: Adding A Remote To The Stdma Group

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Figure 3-23 STDMA Remotes Menu screen Adding a Remote to the STDMA Group Entering the item number for the Remote demodulator/router brings up the dialog shown in figure 3-24.

  • Page 57: Base

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n • R = Removed – This Remote is currently removed from the burstmap. When displayed, this status indicates that the Hub has removed this remote from the burstmap due to a communications fault.

  • Page 58: Set Remote Policies

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Set Remote Policies This menu item, which appears for GIR and Entry Channel Hub types, allows each Remote to be configured for specific data switching conditions. For Hub STDMA Controllers operating in either GIR or Entry Channel mode, typical load switching is not the mechanism that performs the transition from STDMA to SCPC mode due to traffic load.

  • Page 59: Figure 3-27 Gir Remote Policies Prompt

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Set the Automatic Load Switch Rate to a value greater than the GIR to allow the Remote to be automatically switched out of STDMA and into SCPC mode when traffic exceeds the GIR.

  • Page 60: Delete Remote

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Switching feature Enabled (see the section “STDMA/SCPC Automatic Switch- ing” on page 3-32). Figure 3-29 Remote SCPC Data Rate prompt The Global SCPC Rate command can be used to set the data rate for all or a majority of the Remotes.

  • Page 61: Enable/Disable Remote

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Figure 3-32 Delete Remote prompt Enter the number of the Remote CDD-56X at the command prompt to delete it from the STDMA group for this Hub burst controller.

  • Page 62: Remove Timeout

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 The display is for information only and pressing any key will return the screen to the menu shown in figure 3-23. Remove Timeout Entering R at the command prompt shown in figure 3-23 will display the Remove Timeout dialog shown in figure 3-35.

  • Page 63: Lnb Lo Frequency

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n When a Remote is removed from the group Burst Map, as described in the section “Remove Timeout” above, entering a value in the Remove Retry Time- out dialog defines the amount of time (in seconds) that is allowed to pass before a retry attempt is made to return the removed Remote to the group.

  • Page 64: Stdma Statistics

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 STDMA Statistics Entering V at the command prompt in the STDMA screen displays the STDMA Statistics screen as shown in either figure 3-39 (Hub) or figure 3-40 (Remote). Note that statistics will only be accumulated for a CDD-56X that is configured as a Hub with No Expansion, since that is the only configuration that provides STDMA functionality (on Demod 1).

  • Page 65: Clear

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Figure 3-41 Stats Accumulation Window prompt Clear The STDMA statistics can be Cleared (reset) by entering a C at the command prompt in figure 3-39.

  • Page 66: Stdma/Scpc Automatic Switching

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 parameters are operator selectable. The speed with which STDMA reacts to changes in dynamic load is a function of the Statistics Accumulation Window parameter and the Cycles per New Burst Map parameter, both of which are also operator selectable.

  • Page 67: Auto Switching

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n switching control is performed by the VMS. As is shown in table 2-2, Auto Switching should be Disabled for these two modes. The Auto Switching feature must be Enabled (as described in the section “Feature Configuration”...

  • Page 68: Current Wan Transmit Mode

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Current WAN Transmit Mode The Current WAN Transmit Mode item on the menu in figure 3-43 is infor- mation only and reflects the current transmit status of a unit. In the case of the CDD-56X, there is no transmit function (no modulator) and this parameter is not applicable.

  • Page 69: Stdma Switch Delay

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n A default setting (95%) is provided, but there may be unique network configura- tions which require modifying the STDMA Slot Capacity value. STDMA Switch Delay In order to minimize unnecessary switching from STDMA to SCPC due to tran- sient conditions, such as a temporary spike in network traffic for example, a...

  • Page 70: Keep Alive Timer For Carrier Inhibit

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Typically the default value will be optimum, but if there may be a larger band- width requirement after the switch, the percent allocation value can be increased.

  • Page 71: Delay For Mod

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n a means to coordinate timing and utilize buffering to eliminate these data outages. To access the Hitless Switching screen, enter H from the STDMA/SCPC Auto Switching screen (see figure 3-43).

  • Page 72: Apply Delay Values

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Figure 3-49 Set LockTime prompt To disable Hitless Switching, enter -1 for all lock times. Apply Delay Values To implement any modifications to the Hitless Switching parameters, enter A at the command prompt to apply these values to the modem.

  • Page 73: Expansion Unit

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Expansion Unit The Expansion Unit menu item in the Vipersat Configuration screen (figure 3-6) defines whether the target CDD-56X is to function as an Expansion unit (all demods configured to operate in SCPC mode) or not.

  • Page 74: Unit Name

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Figure 3-52 Network ID prompt The Network ID is used by the VMS to identify units that are common to a network and allows the VMS to manage multiple networks, each with its own unique Network ID number.

  • Page 75: Managing Ip Address

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n CDD-56X responds to the VMS server with a unicast containing its current configuration data, including the CDD-56X’s IP address. When the VMS receives the unicast response, it registers the CDD-56X on the network.

  • Page 76: Management Security

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Once the unit is registered, the I command is removed from the Vipersat Configuration menu. This managing address is automatically updated on a periodic basis for units that are newly enabled, incorrectly set, or following VMS changeovers (redun- dancy switching).
  • Page 77 MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Enter K at the command prompt to configure this feature, as shown in figure 3-56, below. Figure 3-56 Vipersat Management Security screen Enter M at the command prompt to toggle between Enabled/Disabled.

  • Page 78: Primary Heart Beat

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Primary Heart Beat This menu item appears for the Hub terminal only. The Primary Heart Beat feature is a redundancy heart beat message for primary Hub units that provides the option for a periodic communications check message to be sent from the Hub modem to the VMS for backup recovery in N:M redundancy (protected) configurations.

  • Page 79: Figure 3-58 Dpc Configuration Screen

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n levels. The information and commands in the menu will vary depending on the function the target CDD-56X performs in the network. The screen shown in figure 3-58 is from a unit serving as a Hub with STDMA (burst controller).

  • Page 80: Dpc Enabled

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 DPC Enabled The DPC Enabled command (enter E) is a toggle that allows the Dynamic Power Control feature to be either Enabled or Disabled. The CDD-56X is shipped with the DPC Enabled menu item turned off (Disabled) to allow entrance link levels calibration during terminal setup.

  • Page 81: Set Home State Parameters

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Figure 3-61 Target DPC Address prompt The STDMA Burst Controller (Demod 1 on a CDD-56X configured as Hub with No Expansion) is not permitted to specify a DPC Target because the demodulator is receiving multiple bursts very rapidly from all Remotes in the group and is unable to utilize DPC to control the transmit power of the Remote modems.

  • Page 82: Set Current Configuration As Home State

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Figure 3-62 Home State Configuration screen Set Current Configuration as Home State This command sets the selected Demod’s current configuration as its Home State settings.

  • Page 83: Stdma State

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Figure 3-63 Force Modem to Home State warning This command will force the selected Demod to its Home State configuration, replacing its current configuration.

  • Page 84: Receive Fec Type

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 Figure 3-65 Receive Data Rate prompt Note that the valid range for this parameter will vary depending on the Demod- ulation Type, Coding Rate, and FAST feature Data Rate.

  • Page 85: Receive Modulation Type

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Note that Coding Rate 6 (1/1) is not a valid selection when operating in Vipersat mode with Turbo Product Coding. Receive Modulation Type Enter Q to use the dialog shown in figure 3-68 to set the Receive Modulation Type for the selected Demod’s Home State.

  • Page 86: Vipersat Migration

    V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 The Node ID number that appears in this screen verifies that the unit is regis- tered with the VMS and is active in the network. This number is automatically assigned by the VMS.

  • Page 87: Udp Port Base Address

    MN/22137, rev 1 V i p er s at C o n f i g u r a t io n Figure 3-70 Vipersat Migration prompt UDP Port Base Address Should a particular network application require a specific UDP port base address be used, the default address can be changed by entering U at the command prompt in the Vipersat Configuration screen (figure 3-6).
  • Page 88 V i p er s a t C o nf i g u r at i o n MN/22137, rev 1 • Example: “ ” Critical error: should not be in map This alert typically occurs when there are multiple STDMA burst controllers at the Hub incorrectly configured with the same Group ID, thus causing Remotes to appear in more than one bursmap.

  • Page 89: Appendix A Network Addressing

    P P E N D I X ETWORK DDRESSING Introduction This Appendix is an overview of network addressing and how it applies to configuring the CDD-562L/564/564L for use in Vipersat Networks. The subjects covered are: • OSI Model • Binary Math • IP Addressing •...

  • Page 90: The Osi Reference Model

    T h e O S I R ef e r e n ce M o d e l MN/22137, rev 1 The OSI Reference Model OSI is an acronym for Open Systems Interconnection. This is a network model created by ISO (the International Standardization Organization.) The OSI model is the basic standard which forms the basis for all networking protocols.
  • Page 91 MN/22137, rev 1 T h e O S I R e f er en c e M o d el Together, these two sub-layer protocols are responsible for moving packets on and off the network. Layer 3 / Network Layer – Layer 3 is responsible for routing packets through multiple networks.

  • Page 92: Binary Math

    B i na r y Ma t h MN/22137, rev 1 Binary Math Network devices communicate using BITS, where a bit is a single digit repre- sented by a 1 or a 0, or by using BYTEs, where a byte is made up of eight bits in any combination of 1’s or 0’s.
  • Page 93 MN/22137, rev 1 B i n ar y M at h changed the numbering base (radix.) All digital processes are done in binary. The conversion to decimal is done whenever binary values need to be read or entered by humans as their decimal equivalents. A p p e n d i x N e t w o r k A d d r e s s i n g...

  • Page 94: Ip Addressing

    I P Ad d r es si n g MN/22137, rev 1 IP Addressing An IP (Internet Protocol) address is a unique set of numbers assigned to a device on a network to uniquely identify that device (by its IP address). An IP address is a unique number composed of four octets, with each octet separated by a dot.

  • Page 95: Class C

    MN/22137, rev 1 I P A d d r e ss in g • 16-bit network number • 16-bit node number CLASS A CLASS B CLASS C Address Address High- High- Octet Octet Networks Networks Hosts Hosts Class Class Order-Bits Order-Bits Decimal Range Decimal Range...

  • Page 96: Class E

    I P Ad d r es si n g MN/22137, rev 1 Class E • 240.0.0.0 to 255.255.255.255 • Reserved for experimental use and limited broadcast Private Network IP Addresses RFC 1918 defines blocks of addresses for use on private networks: •...

  • Page 97: Subnet Mask

    MN/22137, rev 1 I P A d d r e ss in g In the process of subnetting, bits are borrowed from the host ID portion of an IP address and are then given to the network ID. Then a “Subnet Mask” gets assigned to the host along with the IP address.

  • Page 98: Network Segments

    I P Ad d r es si n g MN/22137, rev 1 Dotted Decimal Dotted Decimal Address Address Binary Values Binary Values IP Address IP Address 192.168.2.66 192.168.2.66 11000000.10101000.00000010.01000010 11000000.10101000.00000010.01000010 Subnet Mask Subnet Mask 255.255.255.0 255.255.255.0 11111111.11111111.11111111.00000000 11111111.11111111.11111111.00000000 ANDing Result ANDing Result 192.168.2.0 192.168.2.0...

  • Page 99: Default Gateways

    MN/22137, rev 1 I P A d d r e ss in g Each of the four subnets can, in turn, support 64 members. The example subnet used above yielded 4 subnets, but you can use a different mask to meet the specific requirements of your network. Default Gateways A default gateway is a network device, usually a router, that is responsible for routing data packets out of the local network segment.

  • Page 100: Figure A-10 Network Node Mac Addresses

    I P Ad d r es si n g MN/22137, rev 1 • The first six characters are issued to the organization. • The second six characters are assigned to the hardware interface by manufacturing. Figure A-10 Network Node MAC Addresses V i p e r s a t C D D - 5 6 X S e r i e s U s e r G u i d e A-12...

  • Page 101: Appendix B Automatic Switching

    P P E N D I X UTOMATIC WITCHING General Automatic switching is a feature of the VMS that allows dynamically changing the network configuration in response to changes in either network traffic loads (Load switching), traffic type (Application switching), or Type of Service (ToS switching) detecting stamped packets with Diffserv values.

  • Page 102: Hitless Switching

    G en e r a l MN/22137, rev 1 back to these intelligent modem/routers, effectively managing the Vipersat network operation in real time, and optimizing each site’s bandwidth usage to meet their QoS and cost requirements within their bandwidth allocation. The result is a stable satellite network connection that automatically responds to the customer’s requirements while continuously monitoring and reacting to chang- ing load, data type, and QoS requirements.
  • Page 103 MN/22137, rev 1 General • LockTimes – LockTime settings for the four data rates displayed can be adjusted either up or down, but default settings based on satellite testing should be used as a starting point. These defaults are stored in each modulator/demodulator unit and are restored by entering R at the command prompt.

  • Page 104: Load Switching

    L o a d S w i t c h i n g MN/22137, rev 1 Load Switching Overview There are three primary functional components involved in the load switching process. • Hub Controller(s)—These are the Hub units that provide the load switching detection mechanism for Remotes that are operating within the shared channel(s).

  • Page 105: Bandwidth Allocation And Load Switching By The Hub Stdma Burst Controller

    MN/22137, rev 1 L o a d S w i t c h in g The basic concept for all load switching is that a running average of current utilization is maintained, and when that utilization exceeds a preset threshold, a switch is initiated.
  • Page 106 L o a d S w i t c h i n g MN/22137, rev 1 Table B-1 STDMA ACK Message Data Size in Unit of Type Bytes Description Measure Notes IP Address of Remote Used by Remote to identify itself Unsigned Queued Bytes...
  • Page 107 MN/22137, rev 1 L o a d S w i t c h in g • Dynamic Slot Mode – The slot size for each Remote is computed based on the time (at the current data rate) needed to transmit all the “Bytes in Queue”.

  • Page 108: Load Switching-Stdma Hub

    L o a d S w i t c h i n g MN/22137, rev 1 Load Switching—STDMA Hub Before discussing how load switching is determined, it is necessary to explain the modem/router parameters that control the switch. Hub Switching Parameters The screens shown in figure B-2 (CDM-570/570L modem/router) and figure B-3 (SLM-5650A modem/router) are examples that show the entries in the Automatic Switching page at the Hub that are used to control load switch-...

  • Page 109: Hub Switching Process

    MN/22137, rev 1 L o a d S w i t c h in g • Load Switching – This is a type of Automatic Switching that is based on the amount of traffic at a Remote. If this feature is not enabled, then no Remote in this STDMA group will be switched based on load.

  • Page 110: Load Switching-Remote

    L o a d S w i t c h i n g MN/22137, rev 1 If the average bandwidth used exceeds the threshold percentage of available bandwidth, then a flag is set indicating a switch is pending. At this point, the statistics are reset and the traffic load is then computed for the time period spec- ified by the switch delay.

  • Page 111: Figure B-4 Auto Switching Menu, Cdm-570/570L

    MN/22137, rev 1 L o a d S w i t c h in g Figure B-4 Auto Switching Menu, CDM-570/570L Remote Figure B-5 Remote Load Switching Page, SLM-5650A • Auto Switching – This is a Vipersat feature that is enabled in the CDM- 570/570L Features menu.

  • Page 112: Determination For Switching

    L o a d S w i t c h i n g MN/22137, rev 1 • SCPC Step Down Threshold – Similar to the Step Up Threshold, except Step Down is used to trigger a switch to a lower data rate when the average traffic load falls below the set value.

  • Page 113: Load Switch Example

    MN/22137, rev 1 L o a d S w i t c h in g Load Switch Example An automatic load switching example, illustrated in the schematic diagram in figure B-6, illustrates how a network can respond to changes in traffic volume or load conditions.

  • Page 114: Reduced Data Flow In Switched Mode (Scpc

    L o a d S w i t c h i n g MN/22137, rev 1 3. The STDMA Controller compares the Remote’s pre-selected buffer limits with its buffer status and, if the buffer status exceeds the preselected limits, the STDMA Controller increases the time-slot allocated to that channel. If this brings the buffer status within established limits, no further changes are made.
  • Page 115 MN/22137, rev 1 L o a d S w i t c h in g This entire process is automatic, following the policies established for the network. The network is dynamically modified, changing configuration to auto- matically respond to changes to the network’s load. The Home Threshold is the bit rate set to trigger a return to the home condition.

  • Page 116: Application Switching

    A p p l i c a t i o n S w i t c h i n g MN/22137, rev 1 Application Switching Note: This Application Switching section refers to functionality of the CDM-570/ NOTE 570L modem/router. Application Switching is not available for SLM- 5650A modem/routers.
  • Page 117 MN/22137, rev 1 A p p l i c a t i o n S w i t c h in g Each application type will have been assigned a bandwidth allocation when the policy for the Remote is established. The voice application, for example, might have had the bandwidth set in the policy to handle three simultaneous voice connections.

  • Page 118: Tos Switching

    T o S S w i t c h i ng MN/22137, rev 1 ToS Switching ToS Background The Type of Service (ToS) byte is an 8-bit field contained within the IP header portion of an IPv4 packet. This field provides a means of marking packets for traffic identification and classification purposes.

  • Page 119: Detection Of Tos Stamped Packets

    MN/22137, rev 1 T o S S w i t c h in g the clear and often provides the only mechanism for identifying and prioritize traffic within the network. The ToS switching feature in the SLM-5650A provides a reliable method for performing automatic dSCPC switching and is the preferred method for most encrypted environments that leave the IP header intact.

  • Page 120: Configuration

    T o S S w i t c h i ng MN/22137, rev 1 Configuration The ToS switching feature can be configured within the SLM-5650A modem using either the CLI or the Web user interface. For simplicity, the Web interface (figure B-9) will be presented in this example.

  • Page 121: Example Implementations

    MN/22137, rev 1 T o S S w i t c h in g Example Implementations ToS Switching Per Device For applications that require an increase in SCPC bit rate for each application device, a separate ToS value must be assigned to each device individually. This provides granular switching for each device and also allows a mesh connection to be established for each device independently.

  • Page 122: Tos Remarking

    T o S S w i t c h i ng MN/22137, rev 1 Figure B-11 Per Type ToS Switching Example ToS Remarking For situations where the application device is not capable of stamping a packet with a ToS value, or where the application traffic is generated by a variety of different hosts and protocols, ToS remarking should be considered.

  • Page 123: Tos To Dscp Value Conversions

    MN/22137, rev 1 T o S S w i t c h in g Figure B-12 ToS Remarking Application ToS to DSCP Value Conversions Application devices or remarking devices often have different ways of display- ing or configuring the ToS or DSCP values used to mark packets. Some devices require the user to input the ToS value while others require input of the DSCP value.

  • Page 124: Mesh Setup Based On Tos Detection

    T o S S w i t c h i ng MN/22137, rev 1 Mesh Setup Based on ToS Detection The detection of a ToS stamped packet by a remote modem can provide the means for setting up a Single Hop On Demand (SHOD) mesh connection from that remote to another remote within the network.

  • Page 125: Entry Channel Mode Switching

    MN/22137, rev 1 E n t r y C h a n n e l M o d e S w i t c h in g Entry Channel Mode Switching Entry Channel Mode (ECM) provides a method for Remotes requiring SCPC access channels to enter/re-enter the network, initially or after a power or other site outage.

  • Page 126: Fail-Safe Operation

    E n t r y C h a n n e l M od e S w i t c h i n g MN/22137, rev 1 their SCPC carrier inhibit flag set. The keep alive message is sent once every two seconds until re-entry is invoked.

  • Page 127: Figure B-14 Ecm Switch Recovery: < 3 Minutes

    MN/22137, rev 1 E n t r y C h a n n e l M o d e S w i t c h in g ECM Switch Recovery < 3min. Burst Switched Remote Demod Demod State Unit Reboot Connected Satellite Delay 250 ms + 30ms E-E...

  • Page 128: Using Stdma Ecm

    E n t r y C h a n n e l M od e S w i t c h i n g MN/22137, rev 1 ECM Switch Recovery > 3min. Burst Switched Remote Demod Demod State Unit Reboot Connected Satellite Delay 250 ms + 30ms E-E...

  • Page 129: Switching An Ecm Remote From Scpc To Stdma

    MN/22137, rev 1 E n t r y C h a n n e l M o d e S w i t c h in g Note: Refer to the Vipersat SLM-5650A modem manual for Entry Channel configuration setup. The text referenced within is similar between the NOTE CDM-570/L and the SLM-5650A;...

  • Page 130: Figure B-17 Ecm Remote List Page, Cdm-570

    E n t r y C h a n n e l M od e S w i t c h i n g MN/22137, rev 1 Figure B-17 ECM Remote List Page, CDM-570/570L 2. From the STDMA Remote List, select the Remote modem unit to be switched from running in SCPC to STDMA mode.

  • Page 131: Dynamic Entry Channel Mode

    MN/22137, rev 1 E n t r y C h a n n e l M o d e S w i t c h in g and not switch out to SCPC unless either an application switch occurs or a manual switch is invoked.

  • Page 132: Hub Configuration

    E n t r y C h a n n e l M od e S w i t c h i n g MN/22137, rev 1 required acquisition time of the receiver and the amount of time allowed for M&C packet transactions.

  • Page 133: Remote Configuration

    MN/22137, rev 1 E n t r y C h a n n e l M o d e S w i t c h in g Figure B-20 Entry Channel Mode v2 Configuration, Hub (CDD-564L) Remote Configuration The demodulator (receive) configuration of each Remote in the group must be set appropriately in order to receive the TAP from the Hub.

  • Page 134: Ecm Processing

    E n t r y C h a n n e l M od e S w i t c h i n g MN/22137, rev 1 Figure B-21 Entry Channel Mode v2 Configuration, Remote (CDM-570L) ECM Processing A detailed representation of the sequence of steps that occur between the Hub units (the channel controller and a switched demodulator), the Remote unit, and the VMS during the ECM process is shown in figure B-22.

  • Page 135: Figure B-22 Ecmv2 Processing Diagram

    MN/22137, rev 1 E n t r y C h a n n e l M o d e S w i t c h in g Switched Remote Demod Sta te B oot D is con nec ted Satellite Delay Announcement RCV VMS Announcement &...
  • Page 136 E n t r y C h a n n e l M od e S w i t c h i n g MN/22137, rev 1 { This Page is Intentionally Blank } B-36 V i p e r s a t C D D - 5 6 X S e r i e s U s e r G u i d e...

  • Page 137: Appendix C Dynamic Power Control

    P P E N D I X YNAMIC OWER ONTROL Introduction Dynamic Power Control (DPC) provides a mechanism whereby Vipersat satel- lite links have their transmit power levels adjusted in order to optimize the receive signal quality, as measured by the corresponding demodulator E This optimization process acts to either increase or decrease transmitted signal levels in order to: •...
  • Page 138 I n t r o d u c t i o n MN/22137, rev 1 caused, for example, by the use of different antenna sizes in a mesh network, or by rain fade conditions. Receive signal quality and use of system resources is optimized, resulting in a reduction in power amplifier intermodulation as well as conservation of satellite transmit power.

  • Page 139: Description

    MN/22137, rev 1 Description Description The behavior of the Dynamic Power Control feature is designed to regulate power by utilizing the uplink margin to limit the maximum effective transmitted power (EIRP ) of the terminal. The DPC function in the IP-enabled Vipersat- optioned modems provides controls allowing an operator to input site budget numbers that compensate and limit modulator output power.

  • Page 140: Theory Of Operation

    D es cr i p ti o n MN/22137, rev 1 Offset adjustments to the modulator transmit power during rain fade conditions are applied to incoming switch commands from the VMS. This prevents possi- ble link failures due to power value changes associated with changes in band- width, modulation, etc.
  • Page 141 MN/22137, rev 1 Description Mbps. With a set margin of 5 dB, the additive power is never greater than the set level at any rate, but still provides a full range of power, up to the site maxi- mum. Figure C-1 Data Rate to Power Relationship, DPC Note that only base rates are used in this example, with no alternative modula- tion or code rates.

  • Page 142: Figure C-2 Excessive Max Power Example

    D es cr i p ti o n MN/22137, rev 1 The Max Power calculator takes into consideration all the above variables and compares them to the modem BER waterfall curves to determine if the modula- tor range is sufficient to achieve the budgetary information. If the calculator returns an error [INVALID], the base level is either too high or the set parame- ters have exceeded the capacity of the equipment.

  • Page 143: Configuration

    MN/22137, rev 1 Configuration point of the HPA. See “Signal Power Level Considerations” on page C-15 for more information. Configuration The DPC menus (CLI, Parameter Editor, WSI) provide configuration and cali- bration control to set up the site maximum power level. Note, however, that the Parameter Editor and the WSI only support a subset of what is available in the Command Line Interface (CLI).
  • Page 144 C o nf i g ur at i o n MN/22137, rev 1 Table C-1 DPC Parameters, Main Menu Parameter Menu Default Description SOTM Offset Main; Display Satcom-On-The-Move hunt power adjustment Modulator Only when operating in STDMA mode. When enabled, this offset value is applied to the BaseLine Power when switching into SCPC mode.

  • Page 145: Main Dpc Menu

    MN/22137, rev 1 Configuration Table C-2 DPC Parameters, Calculate Max Power Menu Parameter Menu Default Description Calculate Max Calculate Calculate After entering all maximum budgetary settings, Power Max Power; Command this menu command will generate the Max Modulator Power value for the modulator. Max Power Calculate Display...

  • Page 146: Enable Dpc

    C o nf i g ur at i o n MN/22137, rev 1 changed from the CLI Calculate Max Power menu (figure C-5). The calculator function is not available from the Parameter Editor because it does not contain the information for the modem BER waterfall curves, which is vital to calculate maximum power.

  • Page 147: Speed Up Eb/No Range

    MN/22137, rev 1 Configuration carrier value. When this value is received by the transmitting modulator, it is compared to the set value; if they are different, the modulator servos its output power level to achieve the targeted E level. The modulator DPC function can support multiple demodulators as assigned by the system.

  • Page 148: Figure C-5 Dpc Calculate Max Power Screen, Cli

    C o nf i g ur at i o n MN/22137, rev 1 This calculator uses the site budgetary numbers to determine the maximum power value when operating at peak transmission settings. After the operator enters all parameters and selects the Calculate Max Power command, the calcu- lator compares the values to base numbers and selected BER tables to determine the power budget based on the total margin.

  • Page 149: Calibrated Data Rate

    MN/22137, rev 1 Configuration Calibrated Data Rate This is the Baseline Home State Data Rate and is used as the base reference value to calculate the maximum DPC Margin. DPC Margin The Margin setting governs the upper power limit for all combinations of wave- forms given.

  • Page 150: Max Power

    C o nf i g ur at i o n MN/22137, rev 1 Max Power After entering all site budgetary numbers and selecting the Calculate Max Power command, the system processes the max settings against the BER tables to determine and display the site maximum power limit. This maximum power value is achieved only when all parameters are dynamically set to maximum and the environmental conditions are at diminished capacities.

  • Page 151: Signal Power Level Considerations

    MN/22137, rev 1 S i g n a l P o w e r L e v e l C o n s i d e r a t i o n s Signal Power Level Considerations There are many parameters to consider when planning and commissioning a site for satellite transmission.

  • Page 152: Power Considerations

    S i g n a l P o w e r L e v e l C o n s i d e r a t i on s MN/22137, rev 1 level is then calculated based on the BUC’s P max minus the transmit cable loss.
  • Page 153 MN/22137, rev 1 S i g n a l P o w e r L e v e l C o n s i d e r a t i o n s A good note here is that, with the typical LO frequencies as shown in the exam- ple above, transmit and receive L-band frequencies are widely separated.
  • Page 154 S i g n a l P o w e r L e v e l C o n s i d e r a t i on s MN/22137, rev 1 Table C-3 Typical Coaxial Cable Characteristics Cable Type Max.

  • Page 155: Ecm Migration

    P P E N D I X ECM M IGRATION Migrating from STDMA/ECMv1 to Aloha/ECMv2 in a CDM-570/L Network General The material in this appendix is offered to provide a step-by-step procedure for network operators to migrate an STDMA/ECMv1 control channel to the latest version of Aloha/ECMv2.
  • Page 156 G en e r a l MN/22137, rev 1 All other standard controls for access into dSCPC are maintained, but because of a new fixed entry switch type, VMS version 3.9.2 or greater is required. Because most networks are likely to have Remote sites off-the-air for various reasons, the task of upgrading all locations during a planned maintenance period introduces complexity, particularly where the upgrade breaks current protocol.

  • Page 157: Migration Procedure

    MN/22137, rev 1 M i g r a t i on P r oc e d u r e Migration Procedure This procedure is intended for Remote sites that are online or offline with Hub communications. The following steps are accomplished remotely through communication links from Hub to Remote site.

  • Page 158: Figure D-1 Stdma Configuration Page, Remote

    M i gr at i o n P r o ce d u r e MN/22137, rev 1 Figure D-1 STDMA Configuration Page, Remote CDM-570/L 3. Click on the OK button to implement the change, and Save to Flash when prompted to ensure that this new configuration is preserved during Hub con- figuration.

  • Page 159: Configure Hub Unit

    MN/22137, rev 1 M i g r a t i on P r oc e d u r e Configure Hub Unit Once all active Remotes have been configured to ECMv2/Online state, the next step is to configure the ECM Hub Channel Controller, which can be the demod- ulator on either a CDM-570 or a CDD-56X.

  • Page 160: Figure D-3 Stdma Menu, Ecmv2 Hub Type

    M i gr at i o n P r o ce d u r e MN/22137, rev 1 After the Hub Type is changed to ECMv2, the controller will start sending TAP multicast messages using the burst map multicast address 239.1.2.3, and broad- casting to the group the frequency, data rate, and timing as well as where and when the Remotes can transmit.

  • Page 161: Figure D-4 Switch Rate Limits, Inband Return Path

    MN/22137, rev 1 M i g r a t i on P r oc e d u r e Example: The recommended settings for 64 kbps, QPSK, 3/4 • Guardband—60 msec • Preamble Length—300 msec • Total Slot Count—10 Tip: A Vipersat calculator is available to optimize these settings. Contact a Comtech Vipersat Networks representative for a copy of the latest Vipersat ECM Calculator.
  • Page 162 M i gr at i o n P r o ce d u r e MN/22137, rev 1 5. Save the configuration to Flash on the ECM Hub Controller. This concludes the ECM migration procedure. V i p e r s a t C D D - 5 6 X S e r i e s U s e r G u i d e...

  • Page 163: A P P E N D I X

    P P E N D I X LOSSARY A signal used in computing and other fields to indicate acknowledgement, such as a packet message used in TCP to acknowledge the receipt of a packet. Adaptive Coding and Modulation – A technique that optimizes throughput in a wireless data link by adapting the forward error correction code rate and the modulation order according to the noise conditions (or other impairments) on the link.
  • Page 164 Comtech Data Demodulator (CEFD model designator; e.g., CDD-564) Comtech Data Modem (CEFD model designator; e.g., CDM-570) CEFD Comtech EF Data – Global leader in satellite bandwidth efficiency and link optimization, and supplier of advanced communication solutions. A subsidiary of Comtech Telecommunications Corporation.
  • Page 165 MN/22137, rev 1 Cyclic Redundancy Check – A method of applying a checksum to a block of data to determine if any errors occurred during transmission over communica- tions links. Carrier – A radio frequency transmission linking points and over which infor- mation may be carried.
  • Page 166 FAST Code Fully Accessible System Topology Code – Designation for feature code used by Comtech EF Data for their satellite modems. The FAST method makes it easy to quickly upgrade the feature options of a modem while it is running live in the network, either on site or remotely.
  • Page 167 MN/22137, rev 1 Guaranteed Information Rate Group ID A number assigned to equipment which defines it as a member of a group when addressed by the VMS Hub Controller. Graphical User Interface – A form of graphical shell or user interface to a computer operating system or software application.
  • Page 168 MN/22137, rev 1 IGMP Internet Group Management Protocol – An IP communications protocol used by network hosts and adjacent routers to establish multicast group member- ships. Image A binary firmware file that provides the operational code for the processor(s) in a network unit.
  • Page 169 MN/22137, rev 1 Local Oscillator – A component used in upconverters, downconverters, and transponders for frequency translation (heterodyne) of the carrier signal. M&C Monitor & Control Media Access Control – A protocol controlling access to the physical layer of an Ethernet network. Mbps Mega bits per second –...
  • Page 170 Remote node. Network Processor – Also referred to as the IP Module. An optional assembly for Comtech EF Data modems that provides the 10/100 BaseT Ethernet inter- face that is required when used in Vipersat networks.
  • Page 171 MN/22137, rev 1 PSTN Public Switched Telephone Network – The world’s public circuit-switched telephone network, digital and analog, and includes mobile as well as land-line voice and data communications. Periodic Update Message – A packet message that is sent by newer Vipersat modems (e.g., CDM-840) to the VMS every sixty seconds, providing either registration request or status update and operating parameter information (SUM).
  • Page 172 MN/22137, rev 1 RS-232 A common electrical/physical standard issued by the IEEE used for point to point serial communications up to approximately 115 kb/s. Real-time Transport Protocol – A standardized packet format for delivering real-time applications such as audio and video over the Internet. Frequently used in streaming media systems, videoconferencing, and VoIP.
  • Page 173 MN/22137, rev 1 Transmission Announcement Protocol – A proprietary multicast message sent out by the HCC to all associated Remotes in the group, specifying the relative start time and duration for each terminal to transmit while in Entry Channel mode (ECMv2). TCP/IP Transmission Control Protocol / Internet Protocol –...
  • Page 174 MN/22137, rev 1 Vipersat Circuit Scheduler – The ArrangeLink VCS is a proprietary satellite communication scheduling system used to schedule Vipersat network resources in support of a variety of high-priority applications such as video conferencing and scheduled broadcasting. VersaFEC Advanced forward error correction technology from CEFD that provides maxi- mum coding gain with lowest possible latency to support latency-sensitive data applications, such as voice, video, and cellular backhaul.
  • Page 175 MN/22137, rev 1 WRED Weighted Random Early Detection – A queue management algorithm with congestion avoidance capabilities and packet classification (QoS) providing prioritization. A p p e n d i x E - G l o s s a r y E-13...
  • Page 176 MN/22137, rev 1 { This Page is Intentionally Blank } E-14 V i p e r s a t C DD - 56 X S e r i e s U s e r G u id e...

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