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General DataComm SpectraComm 553 Installation & Operation Manua

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6SHFWUD&RPP#886
Fractional T1 DSU
Installation & Operation Manual
076R155-000
Issue 7
April 2002

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Summary of Contents for General DataComm SpectraComm 553

  • Page 1 6SHFWUD&RPP#886 Fractional T1 DSU Installation & Operation Manual 076R155-000 Issue 7 April 2002...
  • Page 2 General DataComm, Inc. The information in this document is subject to change without notice. General DataComm assumes no responsibility for any damages arising from the use of this document, including but not limited to, lost revenue, lost data, claims by third parties, or other damages.
  • Page 3 Preface Scope This manual describes how to install and operate the SpectraComm 553 Fractional T1 Data Service Unit. The information contained in this manual has been carefully checked and is believed to be entirely reliable. However, as General DataComm improves the reliability, function, and design of their products, it is possible that information may not be current.
  • Page 4 Never install telephone jacks in a wet location unless the jack is designed for that location. • Never touch uninsulated telephone wires or terminals unless the telephone line is disconnected at the network interface. • Never install telephone wiring during an electrical storm. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 5 If so, the telephone company will notify you in writing. All repairs or modifications to the equipment must be performed by General DataComm. Any other repair or modification by a user voids the FCC registration and the warranty.
  • Page 6 Cette précaution est particulièrement importante dans les régions rurales. Avertissement: L’utilisateur ne doit pas tenter de faire ces raccordements lui-même; il doit avoir recours à un service d’inspection des installations électriques, ou à un électricien, selon le cas. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual...
  • Page 7 Cet appareil numerique de la classe A est conforme a la norme NMB-003 du Canada. EC Declaration of Conformity Safety EN 60950: 1997 A1 through A7 Low Voltage Directive relating to electrical equipment designed for use within certain voltage limits. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 8: Preface

    Service Support and Training VITAL Network Services is a leading single-source, data communications organization which provides network service and support for General DataComm customers throughout the world. Vital Network Services provides the support and training required to install, manage and maintain your GDC equipment.

  • Page 9: Table Of Contents

    Chapter 3: Operation Controls and Indicators ......................3-1 Management Features ......................3-5 Terminal Interface........................3-6 Initiating a Terminal Interface Session................3-6 Shelf Inventory Screen .....................3-8 Main Menu ........................3-9 Configuration........................3-10 076R155 -000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 10 Appendix C:Alarm Definitions Network and Cascade Alarms ....................C-2 Network/Cascade Out Of Frame..................C-2 Network/Cascade Loss Of Signal ..................C-2 Network/Cascade Alarm Indication Signal..............C-2 Network/Cascade Unavailable Signal State..............C-2 Network/Cascade Bipolar Violations................C-2 viii SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 11 Timing....................... D-4 Channel Timing (External/DTE Timing) ............... D-5 Cascade Timing ....................... D-6 Station Timing ......................... D-9 Typical Network Applications .................... D-10 Back-to-Back Application ..................... D-10 PBX Application ......................D-12 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 12 Table of Contents SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 13: Chapter 1: System Description

    System Description Chapter 1: Overview The SpectraComm 553 Data Service Unit (SC 553 DSU) is a highly efficient means of transmitting and receiving digital data. It provides interface between customer equipment and a T1 or Fractional T1 (FT1) digital carrier facility provided by a Telco or other carrier.

  • Page 14: Sc 553 Data Service Unit Features

    DSUs are installed in a ring arrangement. • Compatible with remote NMS 553 or SC 553 DSUs for transmission and reception of user data. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 15: Fractional T1 Capabilities

    SCM-compatible products, with a single SCM used for the control of all the devices in the shelf. Diagnostic testing performed through SNMP does not require intervention by personnel at remote sites. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 16: Application

    FT1A group (Network) The DTEs at the ends of each fractional T1 link need to be at approximately equal distances from their ends of the T1 line. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 17 DSUs 3 and 4 reconfigure automatically to route FT1B channel data over T1B; FT1A channel data continues to operate over T1A. Consult accompanying text for further information on the Fault Tolerant Switching application. Figure 1-1 Fault Tolerant Switching 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 18 Channel Interface EIA 530: DB25 male-to-EIA 422/449 37-pin male 023H603-XXX* * XXX represents the three digits that indicate cable length in the actual part number (Sheet 1 of 2) SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 19 Terminal Port Cable for use with SpectraComm 2000 enclosure - RJ45 connectors 830-128-807 (length: 7 ft. -807) * XXX represents the three digits that indicate cable length in the actual part number (Sheet 2 of 2) 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 20 System Description Fault Tolerant Switching Application SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 21: Chapter 2: Installation And Setup

    If an SC 553 DSU is removed and replaced by another SC 553 DSU in the same slot, the SCM card can automatically configure the new DSU with the Network, Channel, Cascade, and Alarm Configuration op- tion settings that were in effect for the old DSU. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 22: Shelf Connections

    DB25S connector (J1 to J16) per slot. Power DTE cable for SC553 DSU attaches to DB25 supply that corresponds to the slot containing the DSU. section Figure 2-1 SpectraComm 5000 Shelf Back Panel SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 23 2000 shelf requires shielded cables at the network interface and at the cascade port interface (if it is in- stalled). The required cables are available from GDC as Part Nos. 027H251-XXX and 027H245-XXX. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 24: Unpacking And Handling

    The standard business equipment interface for the SC 553 DSU is ITU-T V.35. The DSU can be equipped with an optional, plug-in, piggyback card that supports EIA-530 interface. Appendix B, Interface Signals describes the signals exchanged through the two business equipment interfaces. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 25: Eia-530 Card Installation

    The SC 553 is not equipped to supply span power. The span power option jumper [X1] shown in Figure functions to provide compatibility with spans that are/are not powered from another source. The typ- ical position for X1 is OUT (i.e., not looped). 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 26: Network Connection

    7–13, and J19 supports slots 14–16. The Appendix B, Interface Signals , Table B-4 shows the connector and pins an SC 553 DSU employs when installed in each slot. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual...

  • Page 27: Station Clock/Cascade Port Connection

    SC 5000 shelf or MultiPak enclosure. Its line address is always 1, the DSU is drop 0 for its line, and at the far end of the point-to-point circuit the remote DSU is drop 1. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 28: Timing Options

    DSU’s Network Tx Clock Source to Internal. Leave it set to Re- ceive for a standard Telco network connection. 3. Configure the appropriate options from the following list: SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual...

  • Page 29: Preoperational Check

    T1 switch a second time. If errors are detected during this test there is a problem with the unit. Install a spare unit if one is available. If you require assistance, contact General DataComm Service at the toll-free telephone number listed in the Preface of this manual.
  • Page 30 Installation and Setup Local Test/Self Test 2-10 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 31: Chapter 3: Operation

    Controls and Indicators Figure 3-1 through Figure 3-3 illustrate the SC 553 DSU front panel and explain the functions of the controls, indicators, and connectors. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 32 ALM (Alarm) - Lit when the DSU is Blinks to indicate detected errors during experiencing and alarm condition. a Self-Test. Figure 3-1 Front Panel Indicators SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 33 LED blinks while this test is in progress. Press switch a second time to end a test. TM indicator blinks for QRS errors during self test. Figure 3-2 Front Panel Controls 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 34 Receive Send TX (DSU-to-network) and RX (network-to-DSU) signals. Monitoring does not break the normal TX and RX signal paths. Figure 3-3 Front Panel Connectors SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 35: Management Features

    Each unit can support local terminal interface SC 553 DSU in SC 2000 enclosure, no SCM through back panel TERM connector. Terminal enclosure, no SCM interface What Are You? screen shows both as Remote. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 36: Terminal Interface

    VT100-compatible Terminal Connected to SCM Card When you connect a terminal to the SCM front panel, the first screen to appear is the Main Menu screen shown in Figure 3-4. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 37 SCM front panel, a terminated session returns the display to the SCM Main Menu. If you are using a Tel- net connection, the Telnet session is ended and a new one must be started. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 38: Shelf Inventory Screen

    Drop Inventory Screen When the DSU you select from the Shelf Inventory screen is associated with a dedicated remote, the display returns a Drop Inventory screen like the following SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 39: Main Menu

    SHELF SLOT = 09 [1] CONFIGURATION [2] ALARM CONFIGURATION [3] DIAGNOSTICS [4] MONITOR/STATUS [5] MAINTENANCE [0] GO TO SHELF INVENTORY Select: [ ] Figure 3-7 SC553 Main Menu Screen 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 40: Configuration

    S and press the Enter key to perform the save. In either case, the terminal interface confirms the selected action and then returns to the Main Menu. 3-10 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual...
  • Page 41 Do not enable automatic LBO for both DSUs in a pair connected back-to-back. Do not enable automatic LBO when the DSU is connected to a DS1 Interface Con- nector (Smart Jack): use manual LBO with 0 dB attenuation. 076R155-000 SpectraComm 553 Fractional T1 DSU 3-11 Issue 7 Installation and Operation Manual...
  • Page 42 [e] Network FDL DCC: Disable (Default) Enable – DSU inserts the Diagnostic Communication Channel (DCC) for man- agement of its remote in the Facilities Data Link (FDL) provided by ESF 3-12 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 43 DCC DS0 = DSU adds 1 DS0 to group required to support Channel Rate and uses it for diagnostic channel communications with remote Embedded = DSU performs diagnostic channel communications with remote using the FDL (56 kbps DS0 format only) 076R155-000 SpectraComm 553 Fractional T1 DSU 3-13 Issue 7 Installation and Operation Manual...
  • Page 44 Routing option while that link is available, automatically redirects data through the other T1 interface if the configured link malfunctions. Consult Figure 1-1 for an illustration of how this feature operates. 3-14 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 45 8 x (N+1) ones density requirement when AMI is selected in com- bination with framed N x 64k operation and consecutive DS0s, or with unframed operation. 076R155-000 SpectraComm 553 Fractional T1 DSU 3-15 Issue 7 Installation and Operation Manual...
  • Page 46 Telnet for diagnostics from a remote location. When you determine the unit requires replacement or other on-site attention, this feature enables you to identify it for easy location by on-site personnel. 3-16 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 47: Alarm Configuration

    The window is the time span during which the number of alarm events must equal or exceed the threshold value in order to cause an alarm. 076R155-000 SpectraComm 553 Fractional T1 DSU 3-17 Issue 7...
  • Page 48 Enter key to go to the Alarm Threshold Configuration screen (shown in Figure 3-15). If you are not unmasking any of those alarms, go to step 10. 3-18 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 49 [s] Cascade CRC: MASK [t] Cascade RYEL: MASK [u] MASK ALL [v] UNMASK ALL [0] RETURN TO PREVIOUS MENU Select: [ ] Figure 3-14 Alarm Mask Configuration Screen 076R155-000 SpectraComm 553 Fractional T1 DSU 3-19 Issue 7 Installation and Operation Manual...

  • Page 50: Diagnostics

    Instructions for using the screens to perform tests appear in Chapter 4, Tests , together with descriptions of the diagnostic functions. 3-20 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 51 Current test: T1 511 SelfTest - Time remaining (seconds): 0044 Test status: RUNNING NO SYNC [0] RETURN TO PREVIOUS MENU Select: [ ] Figure 3-17 Diagnostics Results Screen 076R155-000 SpectraComm 553 Fractional T1 DSU 3-21 Issue 7 Installation and Operation Manual...

  • Page 52: Monitor/Status

    DSU can report. Definitions of the alarm conditions appear in Appendix C, Alarm Definitions . When you are done viewing the screen, type 0 to return to the Monitor/Status menu. 3-22 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 53 At low signal levels (-15 dB and below) the unit’s sensitivity to pulse density (number of marks in the data) can cause overlapping in the range display. 076R155-000 SpectraComm 553 Fractional T1 DSU 3-23 Issue 7 Installation and Operation Manual...
  • Page 54 [1] Near-End User displays statistics on error events at the local DSU that are accumulated by the DSU itself. [2] Near-End Network displays statistics on error events at the local DSU that are accumulated by the Telco switching office. 3-24 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 55 DSU to which the local DSU is linked. Type the number that corresponds to the source of the statistics you want to view, and press the Enter key. The Interval Statistics screen then appears. 076R155-000 SpectraComm 553 Fractional T1 DSU 3-25 Issue 7 Installation and Operation Manual...
  • Page 56 When you are done viewing the screen, type 0 and press the Enter key to return to the Monitor/ Status menu. 3-26 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 57 The Inbound PRMs are conditions occurring or detected by the far end DSU, which reports them to the local unit. When you are done viewing the screen, type 0 and press the Enter key to return to the Monitor/ Status menu. 076R155-000 SpectraComm 553 Fractional T1 DSU 3-27 Issue 7 Installation and Operation Manual...

  • Page 58: Maintenance

    [4] Firmware Download – provides access to the Firmware Download Screen, which is described below under its own heading. When you are done viewing the Maintenance screen, type 0 and press the Enter key to return to the Main Menu. 3-28 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 59: What Are You

    Drop Number 00 – local unit 01 – unit being communicated with by means of DCC Channel Interface V.35 Interface EIA 530 Interface Cascade Card Installed Not Installed 076R155-000 SpectraComm 553 Fractional T1 DSU 3-29 Issue 7 Installation and Operation Manual...

  • Page 60: Firmware Download

    Remote if there is not an SCM card in the housing with the When you are done viewing the What Are You? screen, type 0 and press the Enter key to return to the Maintenance screen. General DataComm SC553: SpectraComm Single-channel Fractional T1 CSU/DSU Firmware Revision: Unit Serial Number:...
  • Page 61 DSU zips and stores the firmware that it had been operating with 076R155-000 SpectraComm 553 Fractional T1 DSU 3-31 Issue 7 Installation and Operation Manual...
  • Page 62 SC 553 DSUs in a shelf (or pair of shelves) at once. The figure on the following page provides further definitions of the filename and address formats. 3-32 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 63 6. While the download is taking place the Standby Firmware Status line displays Downloading. That is followed by a period of approximately 40 seconds while it displays Calculating Checksum. 076R155-000 SpectraComm 553 Fractional T1 DSU 3-33 Issue 7 Installation and Operation Manual...
  • Page 64 Operation Terminal Interface 3-34 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 65: Chapter 4: Tests

    The T1 and Channel categories each provide a variety of loopbacks, both toward the local DTE interface and toward the network. The DS0 category provides a loopback toward the network and a round-trip Circuit Delay test. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 66: Terminal Interface Test Procedure

    5. If you are performing a T1 or DS0 test and the optional cascade port is present, you have to select the T1 interface (Network or Cascade) for the test. Type 4 for a T1 Test or c for a SpectraComm 553 Fractional T1 DSU 076R155-000...
  • Page 67 Test Duration because it includes hold time that follows the test to permit resynchronization of any network devices that are affected by the test (does not apply to DS0 Delay Test) 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 68 Current test: T1 511 Self Test - 30 sec Time remaining (seconds): 0044 Test status: RUNNING NO SYNC RETURN TO PREVIOUS MENU Select: Figure 4-2 Diagnostics Results Screen SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 69: T1 Tests

    Network Interface Remote Framer Device Driver Driver Framer Analog Receiver Interface TPG = Test Pattern Generator TPC = Test Pattern Checker Figure 4-4 T1 End-to-End Self Test, Cascade Interface 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 70: T1 Payload And Line Loops

    DSU, either at the front panel jacks or at the DTE interface. SC 553 DSU Smart Jack Driver Inter- Framer Network Test Device face Analog Receiver Figure 4-6 T1 Network Interface Loop SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 71: T1 Remote Test With Self-Test

    Device Driver Driver Framer Analog Receiver HELLO Interface TPG = Test Pattern Generator TPC = Test Pattern Checker Figure 4-8 T1 Remote Test with Self Test, Cascade Interface 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 72: T1 Remote Test

    Test Device Remote DSU SC 553 DSU Analog Driver Receiver Inter- Inter- Framer Framer Network face face Analog Receiver Driver Figure 4-9 T1 Remote Test, Network Interface SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 73 T1 Tests SC 553 DSU Cascade Interface Analog Receiver Remote Network Interface Framer Device Driver Driver Framer Network Analog Receiver Interface Figure 4-10 T1 Remote Test, Cascade Interface 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 74: T1 Local Test With Self-Test

    T1 indicator is lit during the test. Self Test run by front panel switch always uses QRS. Press switch again to end the test. Figure 4-11 T1 Local Test with Self-Test, Network Interface 4-10 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 75: T1 Local Test

    Tests cannot be performed by means of front panel switches when the front panel has been inhibited by an SNMP controller or by the terminal interface. Front panel enabled is the default condition. 076R155-000 SpectraComm 553 Fractional T1 DSU 4-11 Issue 7...
  • Page 76 T1 Local Test, Network Interface SC 553 DSU Cascade Interface Analog Receiver Remote Network Interface Framer Device Driver Driver Framer Network Analog Receiver Interface Figure 4-14 T1 Local Test, Cascade Interface 4-12 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 77: Channel Tests

    Tests cannot be performed by means of front panel switches when the front panel has been inhibited by an SNMP controller or by the terminal interface. Front panel enabled is the default condition. 076R155-000 SpectraComm 553 Fractional T1 DSU 4-13 Issue 7...
  • Page 78 Inter- Framer Network face face Analog Receiver Driver TPG = Test Pattern Generator TPC = Test Pattern Checker Figure 4-16 Channel Remote Digital Loop with Self Test 4-14 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 79: Channel Remote Digital Loop

    RL lead can only command Remote Test if Channel EIA Test Leads has been enabled by an SNMP controller or by the terminal interface. The default condition is disabled. 076R155-000 SpectraComm 553 Fractional T1 DSU 4-15 Issue 7 Installation and Operation Manual...
  • Page 80 RL lead can only command Remote Test if Channel EIA Test Leads has been enabled by an SNMP controller or by the terminal interface. The default condition is disabled. Figure 4-17 Channel Remote Digital Loop 4-16 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 81: Channel Digital Loop

    Local Loop with Self Test can be commanded by means of the terminal interface or by SNMP control. SC 553 DSU Driver Inter- Framer face Analog Receiver Channel Local Loop with Self Test Figure 4-19 076R155-000 SpectraComm 553 Fractional T1 DSU 4-17 Issue 7 Installation and Operation Manual...

  • Page 82: Channel Local Loop

    DTE. (Test equipment can be connected in place of BPV AIS the DTE. OOF NS SC 553 DSU Driver Inter- Framer Test Device face Analog Receiver Channel Local Loop Figure 4-20 4-18 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 83: Ds0 Tests

    The DS0 Circuit Delay test can be commanded by means of the terminal interface or by SNMP control. 076R155-000 SpectraComm 553 Fractional T1 DSU 4-19 Issue 7 Installation and Operation Manual...

  • Page 84: Ds0 Loopback

    A DS0 Loopback can be initiated from the terminal interface or by SNMP control. SC 553 DSU Driver Inter- Framer Network face Analog Receiver Only the selected DS0 is looped Figure 4-23 DS0 Loopback 4-20 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 85: Appendix A:technical Characteristics

    T1 digital carrier (non-loaded, staggered-twist ABAM, PIC, or pulp-insulated exchange-type cable, 19 to 26 gauge) Line impedance 100 Ohm Network and Cascade port physical RJ48C modular jack interface 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 86 Impedance 100¾ Channel port (cust equip) interface Standard ITU-T V.35-compatible synchronous serial data port Optional EIA-530 compatible synchronous serial data port Physical interface DB25S (25-pin female subminiature-D connector) SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 87 Loop, with Self-Test; DS0 Circuit Delay Measurement Test; DS0 Remote Test, with Self-Test; DS0 Self-Test; Channel Digital Loop; Channel Remote Digital Loop, with Self-Test; Channel Self-Test. Front panel test jacks for DS1 access 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 88 Technical Characteristics SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 89: Appendix B:interface Signals

    Transfers transmitter signal timing information from Data Set to DTE. AA/a DB(B) 108/2 Indicates to Data Set that DTE is prepared for data communication. Controls Local Loopback test Controls Remote Loop test 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 90 Pin No. Receive Data (Ring) To DSU Receive Data (Tip) To DSU Send Data (Ring) From DSU Send Data (Tip) From DSU Note: The remaining leads are not used. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 91 Cascade Receive Data (Tip) To DSU Cascade Send Data (Ring) From DSU Cascade Send Data (Tip) From DSU Station Clock A To DSU Station Clock B To DSU Unused 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 92 (Slot 15) J22 (Slot 16) J22 Cascade Send Data (Ring) Cascade Send Data (Tip) Station Clock A Cascade Receive Data (Ring) Cascade Receive Data (Tip) Station Clock B SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 93: Appendix C:alarm Definitions

    Network and Cascade alarm conditions together. Both categories are concerned with conditions that affect T1 signalling. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 94: Network And Cascade Alarms

    A Received Yellow (RYEL) alarm event occurs when the DSU receives a Yellow alarm at its T1 interface. Network RYEL reflects conditions at the network interface; Cascade RYEL reflects conditions at the Cascade port. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual...

  • Page 95: Network Low Average Density

    An EEPROM Checksum alarm indicates that the DSU has computed a checksum for its software configuration that does not match the one it stored when it was configured. The DSU continually tests for this condition. 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 96: Unit Failure

    A Redundant Mode alarm event occurs when an SC 553 DSU with the cascade port option in-stalled and the redundancy feature enabled reroutes channel data from the primary T1 interface to the redundant T1 interface. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual...

  • Page 97: Appendix D:timing Options

    Slave Timing. Finally, with the optional T1 Cascade Card installed, Cascade Timing allows the equipment on the cascade port to recover the clock from the 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 98: Timing Option Descriptions

    Channel Trans. Master Clock Source Clock Source CSU/ Timing Option Net. Cas. Net. Slave Timing Internal Timing Channel Timing (External/DTE) Cascade Timing (network source) Cascade Timing (cascade source) SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 99: Slave Timing

    CH. Rcv Clk Receive Buffer Timing Source Clock Recovered Translator Receive T1 Clock CH. Send Data Transmit CH. Tx Clk (Send) Buffer Network Send T1 Data Figure D-1 Slave Timing 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 100: Internal Timing

    CH. Rcv Clk Receive Buffer Timing Source Clock Recovered Translator Receive T1 Clock CH. Send Data Transmit CH. Tx Clk (Send) Buffer Network Send T1 Data Figure D-2 Internal Timing SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 101: Channel Timing (External/Dte Timing

    CH. Receive Data Recovered Receive T1 Clock Clock Translator Clock Translator Timing CH. Send Data Source Transmit CH. Ext Clk (Send) Buffer Network Send T1 Data Figure D-3 Channel Timing 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 102: Cascade Timing

    Cascade Timing without the T1 Cascade Card When the T1 Cascade Card is installed but disabled, or when the card is removed, the SC 553 CSU/ DSU uses the alternate timing source. SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual...
  • Page 103 Cascade Equipment Cascade Send DSX-1 Data CH. Send Data Transmit CH. Tx Clk (Send) Buffer Network Send T1 Data Figure D-4 Cascade Timing with a Network Timing Source 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...
  • Page 104 Cascade Send DSX-1 Data Timing CH. Send Data Source Transmit CH. Tx Clk (Send) Buffer Network Send T1 Data Figure D-5 Cascade Timing with a Cascade Timing Source SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...

  • Page 105: Station Timing

    Lower RJ48 jack Internal Receive Station Clock at Zone 1 Shelf Interface Cascade Transmit Interface Backplane Data Highways Network Interface Cascade Cascade Equipment Interface Figure D-6 Station Timing 076R155-000 SpectraComm 553 Fractional T1 DSU Issue 7 Installation and Operation Manual...

  • Page 106: Typical Network Applications

    By selecting Channel Timing (External/DTE Timing) for both CSU/DSUs, the master multiplexer provides timing and the slave multiplexer loops back timing, so timing is dependent on the customer equipment. D-10 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 107 Master Slave Channel Timing Channel Timing (External/DTE Timing) (External/DTE Timing) Mux Loops Timing Timing Source Back to CSU/DSU C. Master/Slave Multiplexer Timing Figure D-7 Typical Back-To-Back Applications 076R155-000 SpectraComm 553 Fractional T1 DSU D-11 Issue 7 Installation and Operation Manual...

  • Page 108: Pbx Application

    Cascade Timing Cascade Timing (Alt. Internal Timing) (Alt. Slave Timing) Timing Source Slave Master Timing Option: Timing Option: Slave Timing Master Timing Figure D-8 Typical PBX Application D-12 SpectraComm 553 Fractional T1 DSU 076R155-000 Installation and Operation Manual Issue 7...
  • Page 109 MultiPak Enclosure Back Panel 2-4 EIA-530 Card Installation 2-5 Electrical Power Connection 2-7 Equipment List 1-6 Network Configuration Scree 3-11 External Alarm Indication 2-7 Network Connection 2-6 076R155-000 SpectraComm 553 Fractional T1 DSUfor XXXXXVersion X.X.X IX-1 Issue 7 Installation and Operation Manual...
  • Page 110 Timing Option Descriptions D-1 Timing Options 2-8, D-1 TR54016 Current/Total Statistics Screen 3-24 TR54016 Interval Statistics Screens 3-25 Universal Back Plane for SpectraComm 5000 Shelf, Zone 1 2-3 IX-2 SpectraComm 553 Fractional T1 DSU Version X.X.X 076R155-000 Installation and Operation Manual Issue 7...

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