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Nortel QMT7 ADM Manual

Nortel QMT7 ADM Manual

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Meridian 1
Meridian Data Services
Description
Document Number: 553-2731-100
Document Release: Standard 5.00
Date: April 2000
Year Publish FCC TM
Copyright © 1990–2000 Nortel Networks
All Rights Reserved
Printed in Canada
Information is subject to change without notice. Nortel Networks reserves the right to make changes in design
or components as progress in engineering and manufacturing may warrant. This equipment has been tested
and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules, and the
radio interference regulations of Industry Canada. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This equipment
generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be required to correct the
interference at their own expense.
SL-1 and Meridian 1 are trademarks of Nortel Networks.
Meridian Data Services
Description

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  • Page 1 All Rights Reserved Printed in Canada Information is subject to change without notice. Nortel Networks reserves the right to make changes in design or components as progress in engineering and manufacturing may warrant. This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules, and the radio interference regulations of Industry Canada.
  • Page 3 December 1992 Standard, release 2.00. Reissued to include updates for X11 release 18. Due to the extent of the changes, revision bars are ommited. August 1990 Standard, release 1.00. Reissued for compliance with Nortel Networks standard 164.0. Meridian Data Services Description...
  • Page 4 Page 4 of 80 553-2731-100 Standard 5.00 April 2000...

  • Page 5: Table Of Contents

    QMT7 ADM ........
  • Page 6 Page 6 of 80 Contents Modem pool cable (QCAD5A) ......QMT9 AIM ......... . . Controls and indicators .
  • Page 7 Contents Page 7 of 80 Outbound Modem Pooling (not AMP) ..... . Inbound Modem Pooling ....... . . Dedicated modems .
  • Page 8 Page 8 of 80 Contents Traffic measurements ........Memory and real time requirements .

  • Page 9: General Information

    Page 9 of 80 General information Meridian 1 data features are optional packages that are compatible with X11 software. They provide integrated voice and data calls. References For complete details concerning specific Meridian data features, refer to the following documents: •...
  • Page 10 Page 10 of 80 General information 553-2731-100 Standard 5.00 April 2000...

  • Page 11: Introduction

    Page 11 of 80 Introduction Content list The following are the topics in this section: • Basic data call configuration 11 • Automated Modem Pooling 12 • Capabilities 18 • Hardware 19 Basic data call configuration The Meridian Data Services features support a wide range of dial-up data communication activities.

  • Page 12: Automated Modem Pooling

    Page 12 of 80 Introduction • Remote Terminal to Local Device applications involve the use of an inbound modem pool for incoming calls to access local devices (terminals or computer ports). The Meridian 1 permits incoming data calling on facilities also used for voice communications, such as WATS, FX and TIE lines.
  • Page 13 Introduction Page 13 of 80 Figure 1 Terminal to Terminal Data Call configuration Meridian Data Services Description...
  • Page 14 Page 14 of 80 Introduction Figure 2 Terminal to Terminal Computer Port Data Call configuration 553-2731-100 Standard 5.00 April 2000...
  • Page 15 Introduction Page 15 of 80 Figure 3 Terminal to Remote Device Data Call configuration Meridian Data Services Description...
  • Page 16 Page 16 of 80 Introduction Figure 4 Remote Terminal to Local Device Data Call configuration 553-2731-100 Standard 5.00 April 2000...
  • Page 17 Introduction Page 17 of 80 Figure 5 Overview of Meridian 1 Data Applications Asynch/Synch SL-1 ASCII terminal M300 SADM touchphone DP1200 display phone Host Stand-alone (2 voice & 2 data) MCDS AIM with Asynch terminal CPI-link Public data X.25 IBM PC network IBM 3101 BSC or SNA...

  • Page 18: Capabilities

    Page 18 of 80 Introduction Capabilities Meridian Data Services allow for flexible configuration of data terminal equipment and permit the customer’s data communications equipment to correspond to actual usage. The following is a summary of the advantages that implementation of the Meridian 1 data feature offers: •...

  • Page 19: Hardware

    Introduction Page 19 of 80 Hardware Configuring data features in the Meridian 1 may require different hardware components. The hardware items available are Modules • QMT7 Asynchronous Data Module (ADM) • QMT8 Synchronous Add-on Data Module (SADM) • QMT9 Asynchronous Interface Module (AIM) •...
  • Page 20 Page 20 of 80 Introduction Circuit Cards • QPC311(QPC341) Data Line Card (DLC) • QPC432 4-Port Data Line Card (4PDLC) • QPC353(QPC354) Modem Pool Line Card (MPLC) • QPC60(QPC284) 500 Set Line Card • QPC452 500 Set Line Card (Double Density) •...

  • Page 21: Equipment Description

    Equipment description Content list The following are the topics in this section: • Reference list 22 • Add-on Data Module 22 • QMT7 ADM 23 • User controls, indicators, and settings 25 • Configurations 25 • Operating Distances 26 •...

  • Page 22: Reference List

    Page 22 of 80 Equipment description • Asynchronous Interface Line Card 36 • Operating characteristics 37 • QMT11 ASIM 37 • Controls and indicators 39 • Configuration 40 • PC Interface Card 41 • Protocol Converters 41 • Multi-Channel Data System 43 •...

  • Page 23: Qmt7 Adm

    SL-1 telephone. The ADM also provides switched, dial-up access from multiple in-house terminal equipment to shared dedicated or voice-grade modems for external data calling. QMT7 ADM The QMT7 provides asynchronous, half or full-duplex operation over 2- or 4-wire transmission lines and, depending on the terminal or modem used, transmission speeds of 50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2000,...
  • Page 24 Page 24 of 80 Equipment description The in-house error rate should be no greater than 1 error x 10 bits and the error rate over trunks should be no greater than 1 error x 10 bits (modem dependent). Co-located ADM When installed in the co-located mode, the ADM mounts on the right side of the telephone as the last add-on module.

  • Page 25: User Controls, Indicators, And Settings

    Equipment description Page 25 of 80 Modem Pool ADM The ADM may be configured as modem pools (see “Features and services” on page 49). The Outbound Modem Pool is accommodated by outgoing standard voice grade or conditioned lines and provides for asynchronous or synchronous transmission.

  • Page 26: Operating Distances

    Page 26 of 80 Equipment description Operating Distances The ADM allows different maximum separation distances from the Meridian 1 peripheral equipment and computers depending upon gauge of wire used to make the connections. Maximum end-to-end distance between ADM can be up to 8000 ft (2440 m) on 22 gauge or 7,000 ft (2134 m) on 24-gauge wire.
  • Page 27 Equipment description Page 27 of 80 Table 1 ADM controls and indicators Controls and indicators Definition DATA key Data DN key—used for originating and answering data calls Lamp Data DN lamp—indicates the call state of DDN: ON—active call OFF—idle WINK—incoming call MODEM CONTROL key Used during call setup to a remote device Lamp...
  • Page 28 Page 28 of 80 Equipment description Table 2 ADM user option selectors (Part 1 of 3) Selector Description Speed setting knob (S2) A 16-position switch used to select transmission speed (bits per second) of a data call (Notes 3 and 4). Option switches (S3) The eight switches allow selection of data code options and operating modes that match the receive and transmit...
  • Page 29 Equipment description Page 29 of 80 Table 2 ADM user option selectors (Part 2 of 3) Selector Description 2W—4W The 2W position provides for local echo while the 4W position does not provide for echo. The QMT8 labels this switch as Echo—No Echo. ECHO—NO ECHO This is a QMT8 switch assignment: The Echo position provides for local echo, while the No Echo position does not...
  • Page 30 Page 30 of 80 Equipment description Table 2 ADM user option selectors (Part 3 of 3) Selector Description Echo—No echo This is a synchronous QMT8/QMT12 switch assignment: The Echo position provides for local echo while the No Echo position does not provide for echo from the ADM. Manual—Auto Ans This establishes how calls to the ADM are answered: manually or automatically.

  • Page 31: Qmt8 Sadm

    Equipment description Page 31 of 80 QMT8 SADM The QMT8 has the same profile as the QMT7, but it supports both asynchronous and synchronous data transmission. A service switch is used to change from one mode of transmission to the other. The QMT8 can operate in the same configuration as the QMT7.

  • Page 32: Data Line Card

    Page 32 of 80 Equipment description The QMT12 supports four basic modes of synchronous data transmission operation: • terminal to terminal • terminal to digital network • terminal to modem • terminal loopback test While the QMT12 is equipped with a V.35 CCITT interface, wire changes within the module can be used to establish an RS-232-C interface.

  • Page 33: 4-Port Data Line Card

    Equipment description Page 33 of 80 4-Port Data Line Card The 4PDLC is located in a Peripheral Equipment (PE) shelf. It meets the physical and electrical specifications of any DLC to data-module interface and provides access to network channels for data information. The 4PDLC is used in applications that require a large concentration of data ports.

  • Page 34: Supplementary Power Unit

    Page 34 of 80 Equipment description Supplementary power unit Each stand-alone and some co-located ADMs must be powered from a supplementary power unit. The supplementary power unit used is a wall or floor-mounted plug-in transformer that supplies 24 V ac ±10%. In the event that the local power to a co-located ADM fails, an optional Power Failure Transfer (PFT) capability can be implemented to ensure that the SL-1 telephone continues to function.

  • Page 35: Controls And Indicators

    Equipment description Page 35 of 80 Features The AIM is a stand-alone module, equipped to transmit and receive data. It meets the DTE/DCE interface requirements of the EIA RS-232-C standard. The electrical characteristics of the interface to the associated Asynchronous Interface Line Card (AILC) meets the EIA RS-422 requirements.

  • Page 36: Configuration

    Page 36 of 80 Equipment description Configuration The AIM provides the interface between an RS-232-C compatible asynchronous DTE through its AILC. The connection to the AILC is made via a miniature 6-position jack mounted on the rear of the housing. The module is equipped with a 7 ft (3.1 m) 6-conductor cord that is terminated with miniature 6-position plugs on each end.

  • Page 37: Operating Characteristics

    Equipment description Page 37 of 80 Operating characteristics The AILC communicates with DTEs that have the following characteristics: Data Code ASCII (ANSI standard X3.4) Terminal Asynchronous, Start-Stop (ANSI standard X3.15-1976) Number of Bits 8-bits including parity Parity unchanged Data Rate 110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200 bps Stop Bits 2 bits for 110 bps, 1 bit for all other speeds...
  • Page 38 Page 38 of 80 Equipment description Features The ASIM is a stand-alone module, equipped to transmit and receive data. It meets the DTE/DCE interface requirements of the EIA RS-232-C standard. The electrical characteristics of the interface to the DLC or to a 4PDLC port are the same as for the ADM.

  • Page 39: Controls And Indicators

    Equipment description Page 39 of 80 Controls and indicators The module is equipped with a speed switch (synchronous), eight mode switches, a keypad dial, data status lamps, and feature/feature keys. The recessed 8-position DIP switch provides for Hotline, Forced DTR, Manual/Auto Answer, Loopback, Async/Sync, HDX/FDX, Ext/Int Clk, and Modem/Network (the last four functions are not applicable with Asynchronous operation).

  • Page 40: Configuration

    Page 40 of 80 Equipment description The function switches provide for Speed Call, Autodial, Modem Call, Ring Again and Release. These switches and the DDN switch (hookswitch) are used to originate and to answer data calls. The top Reserved key (the one under Ring Again) in conjunction with the “*”...

  • Page 41: Pc Interface Card

    Equipment description Page 41 of 80 PC Interface Card The Personal Computer Interface Card (QPC512) permits connection of an IBM Personal Computer or IBM Personal Computer XT directly to the Meridian 1 with standard twisted pair wiring. The card installs easily in the Personal Computer, allowing the computer to be connected to the Meridian 1 through a standard TELADAPT wall jack and the QPC430 AILC.
  • Page 42 Page 42 of 80 Equipment description The protocol converter emulates an IBM cluster controller and can access a variety of IBM applications. ASCII terminals can now be connected to the IBM link using standard telephone twisted pair cable. The ASCII terminals may be located up to 4000 cable feet from the Meridian 1 or dialed in through a modem pool.

  • Page 43: Multi-Channel Data System

    Equipment description Page 43 of 80 There are presently three basic versions available: • The Meridian 1/74 Protocol Converter is an ASCII to SNA/SDLC (PU type 2) device that emulate the IBM 3274 and 3276 controllers. • The Meridian 1/71 Protocol Converter is an ASCII to BISYNC device that emulates the IBM BSC 3274 controller.

  • Page 44: Asynchronous Card

    Page 44 of 80 Equipment description Asynchronous Card The 4-port MCDS-AC is located in the MCDS cabinet and supports four computer ports (or any other device that requires answer only). It provides the drivers and receivers required to meet the electrical interface specifications of the RS-232-C EIA standard.

  • Page 45: Mcds Power Supply

    Equipment description Page 45 of 80 MCDS Power Supply The off-line switched-mode power supply, located in the center of the MCDS shelf, provides multiple, regulated, and protected DC voltage to the MCDS backplane. It supplies steady-state 140 watt multiple, regulated, and protected DC voltage to the backplane from 120 V ac 60 Hz input.

  • Page 46: Configurations

    Page 46 of 80 Equipment description The X.25 Gateway permits building what appears to be a private data network by using PDN services and a network of remotely located Meridian 1s. The computer systems connected to the Meridian 1 may communicate together through the network.
  • Page 47 Equipment description Page 47 of 80 Figure 6 Typical Multi-Channel Data System Power Data Shelf Spectron patch panels Power indicators Data Shelf Spectron patch panels 553-4218 Meridian Data Services Description...
  • Page 48 Page 48 of 80 Equipment description Figure 7 ADM Controls and Indicators Instructions All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy.

  • Page 49: Features And Services

    Page 49 of 80 Features and services Content list The following are the topics in this section: • Reference list 50 • Automatic Dialing 51 • Call Forward All Calls 51 • Call Forward—internal calls 51 • Ring Again 52 •...

  • Page 50: Reference List

    Page 50 of 80 Features and services • Automated Modem Pooling 59 • Outbound AMP 59 • Inbound AMP 60 • Keyboard dialing 60 • Keypad dialing 61 • Synchronous Data Switching 61 • Hotline 61 • Transparent Data Networking 62 •...

  • Page 51: Automatic Dialing

    Features and services Page 51 of 80 Automatic Dialing Description This feature allows a station user to dial a directory number by pressing a single key. The user may change the number associated with Autodial at any time. The directory number may include trunk access and area codes.

  • Page 52: Ring Again

    Page 52 of 80 Features and services Ring Again Description This feature allows a station user to have the system monitor a busy directory number, and when it becomes free, to alert the calling station and to ring the called station. No digits are outpulsed until the alerted station accepts the call.

  • Page 53: Automatic Route Selection

    Features and services Page 53 of 80 Automatic Route Selection Description Automatic Route Selection (ARS) provides the system with the ability to complete outgoing calls using the cheapest and most efficient routing available. Call Detail Recording Call Detail Recording (CDR) is an SL-1 optional software Description package which provides a record of selected calls for accounting and administration purposes.

  • Page 54: Dataport Hunting

    Page 54 of 80 Features and services Dataport Hunting The Dataport Hunting (DPH) feature improves the hunting and ring again operations for modem pooling. Before this feature was introduced, dataports were defined as stations in the software. To establish a pool of dataports, the stations were connected in a hunt chain.

  • Page 55: Digital Trunk Interface

    Features and services Page 55 of 80 Digital Trunk Interface DTI (X11 release 5 and later) provides for a trunk interface between a Meridian SL-1 Digital Network Loop and an external DS-1 Digital Carrier Termination. This provides the capability of an all-digital path for voice and data transmission.

  • Page 56: Remote Peripheral Equipment

    Page 56 of 80 Features and services Remote Peripheral Equipment Description Remote Peripheral Equipment (RPE) allows the range of the multiplexed loop between the common and peripheral equipment to be extended beyond 50 ft (15 m). The peripheral equipment may then be placed closer to the stations it serves and effectively increases the serving area of the Meridian 1.

  • Page 57: Inbound Modem Pooling

    Features and services Page 57 of 80 The Ring Again queuing feature can also be applied by data callers who encounter a busy modem pool at the time of dialing (see “Ring Again” on page 52). Provision The DDN and hunt group of the ADM/modem pair are entered in the office data using LD 11.

  • Page 58: Dedicated Modems

    Page 58 of 80 Features and services Provision The DDN and hunt group of the ADM/modem pair are entered in the office data using LD 11. A 500-telephone line card is required to establish the incoming call connection on the analog side (to analog trunk). The number of pooled modems to be supplied is determined according to customer utilization requirements, calculated by using Meridian Data Features: Traffic Engineering and Configuration (553-2731-151).

  • Page 59: Automated Modem Pooling

    Features and services Page 59 of 80 Automated Modem Pooling Description This feature is only applicable when QMT8 (vintage D11) and higher numbered SADM are used to form the ADM/Modem pair. With AMP, available as an option in X11 release 5, the ADM/Modem pair information is organized in pool lists that contain similar modems, for speed and other options, to be accessed for use with compatible dataports.

  • Page 60: Inbound Amp

    Page 60 of 80 Features and services If the DTI package is equipped and an all-digital path to the remote computer is available, an All-Digital Connection Prefix can be designated in the Customer Data Block. If this special prefix is used with the Prefix or Default method, a modem is not connected when the outgoing route is digital.

  • Page 61: Keypad Dialing

    Features and services Page 61 of 80 Keypad dialing Description This feature allows the ASIM to initiate and/or terminate asynchronous or synchronous data calls to in-house or remote hosts using the ASIM keypad. Provision Keypad dialing capability is provided on ASIM terminals with a standard 12-button dial pad that has the digits 0 through 9, plus the * and the #.

  • Page 62: Transparent Data Networking

    Page 62 of 80 Features and services Use LD 11 to assign the feature to an ASIM or a co-located or a Provision stand-alone ADM. It is assigned as ADL in the overlay and to key/lamp pair number three. The ADM or ASIM must be configured for Hotline. Transparent Data Networking This feature provides a transparent data channel for data Description...

  • Page 63: Meridian Communications Unit

    Features and services Page 63 of 80 Feature Requirements The TDN feature requires the following: • QPC720 card in either DTI or PRI mode • PRI trunks must use either TDN routes or ESN19 Limitations Point-to-point protocols, such as DM-DM, an NT proprietary protocol, are not supported by TDN.
  • Page 64 Page 64 of 80 Features and services Refer to Meridian Communications Unit and Meridian Communications Adapter: Description, Installation, Administration, Operation (553-2731-109) for detailed information on this feature. 553-2731-100 Standard 5.00 April 2000...

  • Page 65: Implementation

    Page 65 of 80 Implementation Content list The following are the topics in this section: • Reference list 66 • Allowable operating distances 66 • Single wire gauge 66 • Mixed wire gauge 67 • AIM 67 • Cable specifications 68 •...

  • Page 66: Reference List

    2000 ft (610 m) 1700 ft (518 m) Note 1: QPC311E or higher vintage with QMT7C/D, QMT8A, QMT12A, MCDS Note 2: QPC311C/D with QMT7C/D, QMT8A, QMT12A, MCDS Note 3: QMT7D operating limitation with Nortel Networks cable 553-2731-100 Standard 5.00 April 2000...

  • Page 67: Mixed Wire Gauge

    Note 1: QPC311E or higher vintage with QMT7C/D, QMT8A, QMT12A, MCDS Note 2: QPC311C/D with QMT7C/D, QMT8A, QMT12A, MCDS Note 3: QMT7D operating limitation with Nortel Networks cable Note 1: A co-located ADM may be installed up to 4000 ft (1200 m) from the DLC.

  • Page 68: Cable Specifications

    Page 68 of 80 Implementation Cable specifications Twisted wire pairs must be used for digital pairs, and no bridge taps are allowed. The crosstalk figure of cable used between the MDF and ADM measured at 64 kHz with 100 ohm termination must be •...

  • Page 69: Adm

    Implementation Page 69 of 80 In the co-located mode, the ADM operates in conjunction with an SL-1 telephone to provide the interface with data terminal equipment in cases where • both voice and data calling are required • answer-and-originate data calling capabilities are required In stand-alone mode (no companion SL-1 telephone), the ADM supports incoming data calls where no voice calling or data-call originating capabilities are required (for example, computer ports and modems).

  • Page 70: Dlc

    Page 70 of 80 Implementation The QPC311 DLC supports SL-1 sets, ADM and ASIM in the following operating combinations: • two independent telephone and two stand-alone ADMs • two co-located telephone/ADM pairs • one co-located telephone/ADM pair plus one independent SL-1 set and one stand-alone ADM •...

  • Page 71: Multi-Channel Data System

    Implementation Page 71 of 80 Multi-Channel Data System The MCDS-AC port may be used instead of ADM to interface multiple ports of a computer. An MCDS-AC port is required to interface each computer port to the equipment using a DLC. Major equipment items required to implement MCDS consist of •...

  • Page 72: Traffic Measurements

    Page 72 of 80 Implementation MCDS backplane The MCDS backplane, which is part of the shelf assembly, is provided with two-sided circuitry. It is equipped with nine 160-pin connectors to receive the interface and power supply circuit packs. It is also equipped with two 25-pair standard telecom-type plugs to connect to the SL-1 switch and 32 female-type, standard 25-pin, RS-232-C connectors to provide interface to the computer ports.

  • Page 73: Administration

    Implementation Page 73 of 80 Administration The Meridian 1 recognizes the ADM, AIM, ASIM, or MCDS-AC port as a telephone; the DLC, 4PDLC, or AILC as an SL-1 line card; and the MPLC as a 500-type line card. LD 10 and LD 11 are used to enter the parameters for data hardware in the SL-1’s office memory.
  • Page 74 Page 74 of 80 Implementation 553-2731-100 Standard 5.00 April 2000...

  • Page 75: Index

    Page 75 of 80 Index Numerics AILC (Asynchronous Interface Line Card) AIM and, 35 4PDLC (4-Port Data Line Card) AT-type dialing support, 35 ASIM connection to, 40 described, 36 described, 33 hardware requirements, 70 500/2500 telephones maximum distance from AIM, 67 connecting ASIM to, 38 operating characteristics, 37 connecting to AIM, 35...
  • Page 76 Page 76 of 80 Index ASIM (Asynchronous Synchronous Interface circuit packs, 20 Module) co-located ADM configuration, 40 Automatic Dialing feature, 51 controls/indicators, 39 described, 24 described, 37 hardware requirements, 69 DLC support, 70 Hotline feature, 61 features, 38 supplementary power units, 34 hardware requirements, 69 computer ports Hotline feature, 61...
  • Page 77 Index Page 77 of 80 data ports DTE (Data Terminal Equipment) 4PDLC and, 33 AIM interface, 36 ADM as, 60 ASIM connection to, 40 DPH (Dataport Hunting) feature, 54 ASIM in asynchronous mode, 39 data rates making data calls without telephones, 60 ADM, 23 operating characteristics, 37 AIM, 35...
  • Page 78 Page 78 of 80 Index inbound modem pools described, 57 maintenance, 72 MPLC and, 33 Manual/Auto Answer DIP switch, 39 stand-alone ADM, 24 MCDS (Multi-Channel Data System) transmission modes supported, 25 backplane, 72 indicators cabinet, 47, 71 4PDLC LED, 33 described, 43 ADM, 25, 27, 48 shelf, 71...
  • Page 79 12 RS-232 (NE-25MQ2A) cord assemblies, 34 RS-232-C interface QCAD5A (modem pool cable), 34 changing QMT12 to, 32 QMT7 ADM, 23 data rates, 31 See also ADM (Add-on Data Modules) QMT8S SADM. See SADM Meridian Data Services Description...
  • Page 80 Page 80 of 80 Index Terminal to Terminal Data Call configurations, 13 terminals. See ASCII workstations; DTE (Data SADM (Synchronous ADM) Terminal Equipment) automated modem pooling, 59 testing, 72 described, 31 traffic measurements, 72 Hotline feature, 61 transmission modes, QMT8 SADM, 31 user option selectors, 29 trunk types, DTI and, 55 signal conversion, 23...
  • Page 82 Description Copyright © 1990–2000 Nortel Networks All Rights Reserved Information is subject to change without notice. Nortel Networks reserves the right to make changes in design or components as progress in engineering and manufacturing may warrant. This equipment has been...

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