3Com DSA-3CV1100-02 User Manual

Visitor and Community Network Access Concentrator

ERVICE

Release 2.0

ANUAL

http://www.3com.com/

Part No. DSA-3CV1100-02 Published August 2000

3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145

Copyright © 2000, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.

3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change.

3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

If there is any software on removable media described in this documentation, it is furnished under a license agreement included with the product as a separate document, in the hard copy documentation, or on the removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

UNITED STATES GOVERNMENT LEGEND

If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private expense. Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995) or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited rights only as provided in DFAR 252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is applicable. You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in, or delivered to you in conjunction with, this User Guide.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries.

3Com, the 3Com logo, and SuperStack, are registered trademarks of 3Com Corporation. 3Com Facts is a service mark of 3Com Corporation.

Procomm Plus is a registered trademark of Datastorm Technologies, inc., a subsidiary of Quarterdeck corporation. All other company and product names may be trademarks of the respective companies with which they are associated.

Guide written by Ruth Zach and Ronald Schwarz. Illustrated by Pearl Goldberg and Ronald Schwarz. Produced by 3Com Corporation.

ONTENTS

BOUT THIS GUIDE

Conventions 7 Related Documentation 8 Year 2000 Compliance 8

VERVIEW

Visitor and Community Network System Major Features and Benefits 9

Features 9

Benefits 10 Applications 11 VCN AC Features 13

Management Features 16

NSTALLING THE

Safety Precautions 19 Précautions de Sécurité 20 Sicherheitsvorkehrungen 20 Preparing the Site for the VCN Access Concentrator 21

Installing the VCN Access Point Punch-down Block with a Patch

Panel 23

Installing the VCN Access Point Punch-Down Block Without a Patch

Panel 25 Installing the VCN Access Concentrator 27

Mounting the VCN Access Concentrator in the 19-inch Rack 28

Connecting Cables to the Rack Via Patch Panel 30

Note on Insertion of Line Cards in the VCN Access Concentrator 33

Connecting Cables to the Rack Without a Patch Panel 33

Mounting the Ethernet Switch 36

Configuring the Ethernet Switch for the VCN Access Concentrator 36 Powering Up the Ethernet Switch 45 Powering Up the VCN Access Concentrator 45

VCN A

CCESS CONCENTRATOR

Proper Selection of Power Cord 45 Selection Du Cable D'alimentation 46 Richtige Auswahl des Stromkabels 46

Troubleshooting 47

ANAGING THE

Real Time LED Indications 49 Using the Management Terminal for Local and Central Management 50

Management Terminal Requirements 50 Connecting the PC Terminal Emulator 51

Line Card Management 52

Local Menus 52 Loading a New Software Release Through the LMA 72

Central Management 80

Overview 80 Central Management Menus in the LMA Interface 82 Central Management Via Telnet 104 Telnet Menus 106

Remote Software Download 112

Overview 112 Requirements 112 Procedure 113 Solving Problems in Remote Software Download 122

ROUBLESHOOTING

Power-on Self Test (POST) 125 Using Front Panel LEDs to Solve Problems 126 Using a PC Terminal Emulator to Solve Problems 127

Ethernet Traffic Counters 127 HDLC Traffic Counters 128 Abnormal Indications from Traffic Counts 129 Error Messages 129

Telnet Connection Problems 130

Inability to Connect 130 Broken Session 131

VCN A

CCESS CONCENTRATOR

RODUCT SPECIFICATION

ERMINAL EMULATION SETTINGS

ECHNICAL SUPPORT

Online Technical Services 141

World Wide Web Site 141 3Com Knowledgebase Web Services 141 3Com FTP Site 142 3Com Bulletin Board Service 142

3Com Facts Automated Fax Service 143 Support from Your Network Supplier 143 Support from 3Com 143 Returning Products for Repair 145

LOSSARY

NDEX

3COM C

EMC S

AFETY STATEMENT

ORPORATION LIMITED WARRANTY

TATEMENTS

BOUT THIS

This guide describes the3Com® Visitor and Community Network Access Concentrator (VCN AC) Release 2.0, how to manage and operate the VCN AC and how to troubleshoot the VCN AC once installed.

This guide is intended for technicians who are responsible for setting-up, operating, and troubleshooting the VCN AC.

The NCU (Network Concentration Unit) name has been changed in release II and is referred to as Visitor and Community Network Access Concentrator.

If release notes are shipped with your product and the information there differs from the information in this guide, follow the instructions in the release notes.

Most user guides and release notes are available in Adobe Acrobat Reader Portable Document Format (PDF) or HTML on the 3Com World Wide Web site:

UIDE

Conventions

http://support.3com.com/

Ta b le 1 and Ta bl e 2 list conventions that are used throughout this guide.

Ta b le 1

Icon Notice Type Description

Notice Icons

Information note Information that describes important features or

instructions

Caution Information that alerts you to potential loss of data or

potential damage to an application, system, or device

Warning Information that alerts you to potential personal injury

8 A

BOUT THIS GUIDE

Year 2000 Compliance

Visitor and Community Network Access Point Service Manual

■

Visitor and Community Network Access Concentrator Service Manual

■

Visitor and Community Network Access Point Mounting Guide

■

Visitor and Community Network Access Concentrator Installation

■

Guide

For information on Year 2000 compliance and 3Com products, visit the 3Com Year 2000 Web page:

http://www.3com.com/products/yr2000.html

VERVIEW

This chapter provides an overview of the Visitor and Community Network Access Concentrator (VCN AC), its operation and advantages.

This chapter includes the following topics:

■ Visitor and Community Network System Major Features and Benefits

■ Applications

■ VCN AC Features

Visitor and Community Network System Major Features and Benefits

Features

A Visitor and Community Network (VCN) system consists of a VCN Access Concentrator (VCN AC) and up to 24 VCN Access Points (VCN AP) connected by conventional 4-wire telephone cables.

The following are the major features of the Visitor and Community Network System:

The Visitor and Community Network System works over existing

■

cabling infrastructure and supports all Plain Old Telephone Services (POTS) while simultaneously providing Ethernet connectivity at speeds up to 10 Mbps full duplex.

The Visitor and Community Network System geographic range is four

■

kilo feet from an VCN AP to an VCN AC over Category 1 to Category 5 cabling.

The system supports Ethernet 802.1Q frames transparently.

■

The customer can simultaneously engage in two analog toll quality

■

conversations while sending high speed digital data on the POTS cable.

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VERVIEW

The system provides fast Internet connectivity and fast corporate

■

access to end-users.

Benefits

The Visitor and Community Network System provides the following benefits:

Existing wiring is used for simultaneous voice calls and data

■

connections. During installation, re-wiring is not required and business operations continue normally.

The system enables a customer to use a telephone extension to place calls while sending and receiving digital data over the same cable. A second extension over the same telephone cable can be used to place another call, send faxes, or connect an analog modem.

The customer receives Internet services more conveniently at faster speeds. Hotel guests traveling on business can access corporate Intranets and use e-mail over much more convenient connections than is currently possible.

The system permits a hotel to provide new data communication services without forfeiting any POTS revenues.

The system’s ready-to-use, out-of-the-box, room-by-room installation

■

provides easy and cost-effective setup in an existing facility’s telecom wiring closet or private branch exchange (PBX) room. Its non-disruptive installation prevents complete hotel or floor shut downs.

The system is totally manageable from the user VCN AP to the VCN

■

AC. Management software provides a real-time view of system status with troubleshooting tools. Both the VCN AP and VCN AC support local management through a terminal emulating computer connection. In the VCN AC, all port cards can be centrally managed from the first card. The VCN AC supports secure remote management through a Telnet connection in the Internet or Intranet. A single VCN AP can be used to remotely download software to a VCN AC attached to an Ethernet switch and to the APs attached to the VCN AC.

The system facilitates low cost of ownership through the re-use of

■

common cabling systems, such as Category 5. The system presents a low cost solution while providing customers with mutiple services over a single wire, and providing operators of hotels, residential telecommunications, and office towers a single manageable network. It offers low cost maintenance and flexible tracking capabilities and is

Applications 11

readily integrated with existing hotel and multiple dwelling unit (MDU) billing systems.

The system is easily expanded to cover the required number of rooms.

■ The Visitor and Community Network System provides a foundation for

future services such as IP telephony. The system offers the capability to present local advertising and local interest information from a Visitor and Community Network (VCN) server to users on their computer monitors. Via a VCN server, Internet, video on demand, and gaming services can be billed.

Applications

The Visitor and Community Network System serves the following applications:

■ Multiple Dwelling Units (MDU)

MDUs include apartment houses and hotels.

■ Multiple Tenant Units (MTU)

MTUs comprise mainly office complexes.

Figure 1

shows a typical MTU/MDU application.

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VERVIEW

Existing Phone Lines

Punch-Down Block

SuperStack II 1100 Switch

6x7x

13x

18x19x

24PortsConcentrator

Com

VCN Access Concentrator

Punch-Down Block

Phone Line

Figure 1

Module

Status

Unit

green

=enabled,linkOK

flashinggreen

=disabled,linkOK

12x

off

=linkfail

11111212112

665

Packet

Status

Packet

151516

1818191920

232324

Power/SelfTest

212122

Status

24x

SuperStackII Switch3300

3C16980

3C10BSO24OA-C

PBX

MTU/MDU Application

Ethernet

Networking Servers

Ethernet

VPN Router

Regular

Phone

Cable

r e w

o n i

Power

Line

m e d o M

-Modem

x a

Fax

F T

R E

H T E

ETHE

VCN AP

Visitor Based

T1 to ISP

PSTN

omo

Corporate

Intranet

Corporate

Server

Firewall

VPN Router

Internet

The VCN AC is connected to the VCN APs, the analog PBX, and an Ethernet switch, e.g. a 3Com VCN Services Switch or a SuperStack II Switch 1100. A standard metallic pair telephone line connects each VCN AP to a VCN AC co-located with the analog PBX or local telephone exchange.

The Visitor and Community Network solution also works with the SuperStack II Switch 3300.

When a personal computer equipped with an Ethernet card is plugged into the Ethernet port of the VCN AP, the Visitor and Community Network system provides fast internet and other network services for data transmissions, and allows voice channels to be used simultaneously.

VCN AC Features 13

A person can speak on the telephone attached to the VCN AP and simultaneously send data from his computer. A telephone extension based on the same cable as the first telephone can be used at the same time as the first telephone. The telephone extension does not share the same wire pair as the computer and does not pass through the VCN AC.

Thus a hotel or a residence that installs a Visitor and Community Network System becomes able to add many more communications services without losing any existing capability.

The VCN AC separates voice and data channels upstream and joins voice and data channels downstream toward the end user for all VCN APs it services.

The Visitor and Community Network System facilitates intra-campus data communications over a high speed Local Area Network (LAN), i.e., Intranet. If the campus is connected to an ISP, the system enables the users on the campus to use the Internet.

Existing LAN infrastructure can be extended to locations currently lacking LAN cabling through the Visitor and Community Network System.

VCN AC Features

Services that do not need the LAN, for example, voice and fax, continue to operate normally.

The main VCN AC feature is to combine data and analog voice in the direction of the VCN APs and to split voice and data in the direction from the VCN APs (see Figure 2

). Analog voice (telephone) is routed to the analog PBX. Data is transferred to the Ethernet switch. The VCN AC allows simultaneous transfer of voice and data of up to 10 Mbps full duplex on each telephone extension line.

14 O

24 Ports Conce ntrator

VERVIEW

Ethernet frames

VCN AP

Ethernet

Figure 2

Ethernet frame

HDLC frame

VDSL fram e

Data frequency

Vo ice c all

POTS line

Transfer of Ethernet Frames in

Voice frequency

E x is t in g PO TS me ta ll ic p air lin e

Visitor and Community Network

PBX

Vo ice c alls

POTS lines

VCN AC

Ethernet

fra mes

Ethernet

JUHHQ

#HQDEOHG/#OLQN# 2.

IODVKLQJ#JUHHQ

#GLVDEOHG/#OLQN#2.

9[ :[

45[

RII

#OLQN#IDLO

66779988::;;<<434344444545445

3DFNHW

6WDWXV

3DFNHW

46464747484849494:4:4;4;4<4<535354545555565657

6WDWXV

4;[4<[4[46[

57[

3C16980

Ethernet sw itch

3RZHU26HOI#7HVW

:9;

6XSHU6WDFN#,, 6ZLWFK#6633

The user’s Ethernet frames are encapsulated in HDLC frames carried in VDSL. Voice and data traffic are carried in their respective frequency ranges in the wire pair that connects the VCN AP to the VCN AC. Voice traffic, including facsimile and analog modem traffic, are not modified.

Figure 3

shows the front panel of the VCN AC. The 24 LAN ports of the VCN AC are connected to the Ethernet switch. Each port is an RJ-45 connector.

VCN AC Features 15

LAN LED LAN Port

Line LED

Power LE D

Figure 3

VCN AC Front Panel

3 4 5 6 7 8 9101112131415161718192021222324

Local Management Access (Hidden connectors)

The VCN AC is connected to the VCN AP via the FROM VCN AP RJ-21 connector on the back panel (Figure 4

). The first 24 of the 25 wire pairs in

the connector, are used to connect 24 VCN APs.

The VCN AC separates the data traffic from the analog conversations. The analog conversations are connected to the PBX via 24 of the 25 wire pairs in the TO PBX RJ-21 connector.

Figure 4

VCN AC Back Panel

From Access Points

MIC

N151

RJ-21 Connected to the VCN AP lines

TO PBX

RJ-21 Connected to

AC power input

AC-INPUT

1 1

90 - 240 V AC

the analog PBX lines

The AC-INPUT connector on the back panel provides power to the VCN AC.

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VERVIEW

Management

Features

The VCN AC provides the following management features:

Real Time LED Indications

The LEDs on the front panel (Figure 3 status of each line in the VCN AC. Ta b le 3

) provide real-time indications of the

describes the VCN AC front

panel LEDs.

Ta b le 3

LED State Used to

LAN Green Indicate connection of the VCN AC to the Ethernet

LINE OFF Indicate VCN AC is not connected to the line.

POWER OFF Indicate that the VCN AC is not powered.

VCN AC Front Panel LEDs

Switch.

Flashing green Indicate data transmission over the VDSL line.

Orange Indicate that the power-on self-test failed if the

LED remains orange for more than 30 seconds.

Green Indicate that the unit is functional.

Local Management

The VCN AC enables local management of every communication port.

Figure 5

shows the VCN AC front panel with the Local Management Access (LMA) ports uncovered. For every VCN AC communication port there is an LMA port. The LMA ports are for connecting ASCII terminals that provide the management interface. The user monitors and manages each communication card through a management terminal directly attached to the card LMA port. Line status information on the VCN AP-VCN AC connection is available.

VCN AC Features 17

The Uncovered LMA Ports

Figure 5

LMA port 1

The Uncovered LMA ports of the VCN AC

3 4 5 6 7 8 9101112131415161718192021222324

Central Management

Central management of all VCN AC ports is performed through LMA port 1 (the leftmost LMA of the VCN AC) or Telnet. The user sends commands to the management agent in card slot 1 through a locally attached management terminal or remotely through a Telnet session. The management agent controls the communications ports by sending them commands and receiving responses through a proprietary management message set. The user monitors and manages the VCN AC from a single point and can view status and statistical information on the VCN AP-VCN AC lines as well as perform certain configurational options such as setting full or half duplex.

LMA port 24

Remote Management

An VCN AC can be centrally and remotely managed via Telnet. Instead of attaching a terminal to the LMA, the user connects to the VCN AC management agent (in the leftmost card slot) though the Telnet protocol over the Internet. Access is password protected. Messages in the management user interface are carried in the VCN AC card slot 1 LAN port, which is connected by an Ethernet link to an Ethernet switch. It is not neccesary for LMA port 1 to be used.

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VERVIEW

NSTALLING THE

VCN A

CCESS

Safety Precautions

ONCENTRATOR

This chapter contains safety precautions, information needed for installing the VCN AP punch-down block, and instructions on how to mount, install, and connect the VCN AC.

This chapter includes the following topics:

■ Safety Precautions

■ Preparing the Site for the VCN Access Concentrator

■ Installing the VCN Access Concentrator

■ Powering Up the Ethernet Switch

■ Powering Up the VCN Access Concentrator

■ Troubleshooting

WARNING: Do not plug in, turn on or attempt to operate an obviously damaged unit.

CAUTION: All servicing should be undertaken ONLY by qualified service personnel. there are no user serviceable parts inside the unit.

WARNING: Be sure to unplug the power supply cord from the wall socket BEFORE attempting to remove and/or replace the power supply.

CAUTION: Do not operate the unit in location where the maximum ambient temperature exceeds 40 degrees C.

CAUTION: Ensure that the chassis ventilation openings in the unit are not obstructed.

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CAUTION: The power supply provided for automatic selection of either 100-120 VAC or 200-240 VAC, 60/50 Hz, as indicated on the safety label adjacent to the power inlet. Ensure that the available voltage supply at the mains is within one of these two ranges.

Précautions de Sécurité

AVERTISSEMENT: Si l'unité est visiblement endommagée NE PAS la brancher au secteur, ni tenter de la mettre en fonction.

ATTENTION: Toute intervention sera effectuée UNIQUEMENT par un personnel qualifié. L'unité ne comporte pas de pièces à remplacer par l'utilisateur.

AVERTISSEMENT: Assurez vous que vous avez bien débranché le câble d'alimentation électrique de la prise de courant AVANT d'essayer de démonter le bloc d'alimentation.

ATTENTION: Ne pas faire fonctionner l'unité dans un endroit où la température ambiante dépasse 40 degrés C.

ATTENTION: Vérifiez que les ouvertures de ventilation du châssis ne sont pas obturees.

ATTENTION: Le bloc d'alimentation sélectionne automatiquement la tension d'entrée (soit 100-120 V soit 200-240 V, alternatif 60/50 Hz) comme indiqué sur l'étiquette de sécurité apposé à côté de la prise. Assurez-vous que la tension disponible au secteur se trouve dans la plage appropriée.

Sicherheitsvorkehrungen

WARNUNG: Schließen Sie die Einheit unter keinen Umständen an das Stromnetz an, schalten diese ein oder versuchen diese zu benutzen, wenn die Einheit klar erkennbar beschädigt ist.

VORSICHT: Alle Wartungsdienste sollten nur von qualifiziertem Wartungspersonal durchgeführt werden. Die Einheit enthält keine Teile, die der Benutzer selbst warten kann.

WARNUNG:

Ziehen Sie den Stromstecker aus der Steckdose,

bevor

Sie

die Energieversorgung entfernen und/oder austauschen.

Preparing the Site for the VCN Access Concentrator 21

Preparing the Site for the VCN Access Concentrator

VORSICHT:

BEDIENEN Sie die Einheit

nicht

, wenn die Temperatur am

Standort 40 Grad C übersteigt.

VORSICHT:

Gewährleisten Sie, daß die Ventilationsöffnungen des Chassis

der Einheit nicht blockiert sind.

VORSICHT:

Die Energieversorgung wählt automatisch entweder 100-120 V WS oder 200-240 V WS, 60/50 Hz, wie auf dem Sicherheitsaufkleber neben der Energiezufuhr angegeben. Gewährleisten Sie, daß die vorhandene Stromleistung des Hauptstromnetzes innerhalb eines dieser möglichen Bereiche liegt.

The punch-down block that connects POTS terminals to a PBX is known as the PBX punch-down block. Figure 6

displays the infrastructure before

the Visitor and Community Network system is installed.

Figure 6 Before the VCN Access Concentrator is Installed

Room

Basement

Punch-Down Blocks

PBX

Before installing the VCN AC in the communications room, perform the following tasks:

Install the VCN AP punch-down block in addition to the existing

punch-down block. Install a rack for the VCN AC.

CAUTION:

Installation should be performed only by a qualified

technician

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The VCN AP punch-down block, which carries both data and voice, can be connected to an optional patch panel, which connects the circuits between the VCN AC and punch-down blocks.

If there is no patch panel, the VCN AC unit connects directly to the VCN AC punch-down block and VCN AP punch-down blocks.

The VCN AC unit should be installed at the PBX punch-down block location, usually in the basement or wiring closet of a building.

The unit is installed in a 19-inch rack along with the SuperStack II Switch 1100/3300 and an optional patch panel.

There are two methods for installing the Visitor and Community Network system:

With a patch panel.

■

Without a patch panel.

■

Preparing the Site for the VCN Access Concentrator 23

Installing the VCN

Access Point Punch-down Block with a Patch Panel

To install the VCN AP punch-down block when there is a patch panel, perform the following steps:

Select the wire pairs according to their position in the RJ-11 telephone

connector in the rear of the VCN AP. The two outside wires comprise the outer wire pair and the two inside wires comprise the inner wire pair, as shown in Figure 7

and Figure 8.

Where there is only one telephone line in a room, the two wires are connected to the inner wire pair of the phone connector shown in

Figure 7

and Figure 8. The outer wire pair of the phone connector is not

used.

■ The inner wire pair carries both voice and digital date.

■ The outer wire pair carries only voice.

Figure 7 VCN Access Point Rear Pane

PHONE

LINE

DC-IN

Figure 8 The Four Wires of the Telephone Cable

Inner wire pair

Outer wire pair

Disconnect the punch-down Krone connector for the inner wire pair from

the PBX punch-down block.

The outer wire pair remains connected to the PBX punch-down block since it will not carry data.

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Connect the Krone connector of the inner wire pair to the new VCN AP

punch-down block, which has been added. Connect another punch-down Krone connector from the VCN AP

punch-down block to the back of the patch panel. Connect an additional punch-down Krone connector from the patch

panel to the PBX punch-down block to carry voice transmissions of the inner wire pair to the PBX.

Repeat step 1

Figure 9

through step 5 for up to 24 telephone lines.

shows the resulting infrastructure.

Preparing the Site for the VCN Access Concentrator 25

Figure 9

Wire pair

connected

to VCN AP

Ext. 1 + Data

VCN AP punch-down

block

Patch Panel

VCN Access Point Punch-Down Block Installation with a Patch Panel

Extension 1

4-wire cable

Wire pair not connected to VCN AP

Punch-Down Blocks

24 wire pairs

Ext. 2

24 wire pairs Ext. 1

TO PBXFROM VCNAP

Extension 2

VCN A ccess P oint (VCNAP)

Ext. 1, Ext. 2

PBX punch-down

block

PBX

Note: If there is only one extension in the room, the wires for the second extension are not used and not connected to the PBX punch down block.

Room

Basement

Installing the VCN

Access Point

Punch-Down Block

Without a Patch

Panel

The installed patch panel must have 48 wire connectors - two for each port.

To install the VCN AP punch-down block in the absence of a patch panel, perform the following steps:

Select the wire pairs according to their position in the RJ-11 telephone connector in the rear of the VCN AP. The two outside wires comprise the

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outer wire pair and the two inside wires comprise the inner wire pair, as shown in Figure 10

and Figure 11.

Where there is only one telephone line in a room, the two wires are connected to the inner wire pair of the phone connector shown in

Figure 10

and Figure 11. The outer wire pair of the phone connector is

not used.

The inner wire pair carries both voice and digital date.

■

The outer wire pair only carries voice.

■

Disconnect the punch-down Krone connector for the inner wire pair from

the PBX punch-down block.

The outer wire pair remains connected to the PBX punch-down block since it will not carry data.

Figure 10

Figure 11

Connect the punch-down Krone connector of the inner wire pair to the

added VCN AP punch-down block. Refer to Figure 12

VCN Access Point Rear Panel

PHONE

LINE

The Four Wires of the Telephone Cable

Inner wire pair

Outer wire Pair

DC-IN

Installing the VCN Access Concentrator 27

Wire pair

connected

to VC NAP

Wire pair not connected to VC NAP

Ex t. 1 + Da ta

VCN AP pun ch-down

block

Figure 12

Pane

Extension 1

Punch-Down Blocks

VCN Access Point Punch-down Block Installation without a Patch

Extension 2

VCNAP

Room

Basem ent

Note: If there is only one

Ex t. 2

PBX punch-down

PBX

block

extension in the room, the wires for the second extension are not used and not connected to the PBX punch down block.

Installing the VCN Access Concentrator

Repeat step 1

through step 3 for up to 24 telephone lines.

The VCN AP and PBX punch-down blocks must each have an RJ-21 connector.

Before installing the VCN AC make sure that:

■

The unit is accessible and can be connected easily.

■

Cabling is away from:

■

Sources of electrical noise such as radios, transmitters and broadband amplifiers

■

Power lines and fluorescent lighting fixtures

■

Water or moisture cannot enter the case of the unit.

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Air-flow is not restricted around the unit or through the vents in the

■

side of the switch. Make sure you provide a minimum of 2.5 cm (1 inch) clearance between the SuperStack II Switch 1100/3300 and the VCN AC

It is recommended to have a ventilated or air conditioned room. The VCN AC is within cable reach of both the patch panel and the

■

SuperStack II Switch 1100/3300 for which the unit is to be attached.

Mounting the VCN

Access Concentrator

in the 19-inch Rack

Ta b l e 4

lists the accessories needed for mounting the VCN AC in the

19-inch rack.

Ta b le 4

No. Part Quantity

1 VCN AC unit 1 2 19-inch brackets 2 3 Handles 2 4 Screws for handles 4 5 Screws for brackets 8

The VCN Access Concentrator Accessory Set

In addition to the VCN AC unit, you will find a box containing the cable kit needed to install the VCN AC.

Ta b l e 5

Ta b le 5

lists the cable kit parts.

The Cable Kit

No. Part Quantity

1 Power Cord 1 2 UTP CAT-5 Patch Cords 24 3 Flat cables (1.5 m each) with

RJ-21 connectors

Installing the VCN Access Concentrator 29

To mount the VCN AC:

Insert one handle into the two outermost bracket holes as shown in

Figure 13

Ensure that the handle is pointing outward from the unit.

Figure 13 Fitting a Bracket for Rack Mounting

Tighten the handle from the rear with the two screws enclosed for this

purpose, using a number 3 Phillips screwdriver (not supplied). Repeat steps 1 and 2 for the second handle.

Match the four holes of the bracket to the four mounting holes on one

side of the VCN AC, as shown in Figure 13 Using the four screws enclosed for this purpose, screw the bracket to the

VCN AC unit. Repeat steps 4 and 5 for the second bracket.

CAUTION:

You must use the screws supplied with the mounting brackets. Damage caused to the unit by using incorrect screws invalidates your warranty.

Insert the VCN AC into the 19-inch rack and secure with two suitable

screws on each side (not provided). Ensure that ventilation holes are not obstructed.

30 C

HAPTER

NSTALLING THE

2: I

CCESS CONCENTRATOR

VCN A

Connecting Cables to

the Rack Via Patch

Panel

The process of connecting cables to the rack varies depending on whether or not a patch panel is used. The procedure of connecting the punch-down blocks to the patch-panel is described in “Preparing the Site

for the VCN Access Concentrator” on page 21.

Back Panel Connections

To connect the back panel of the VCN AC, use the 2 flat cables with RJ-21 connectors supplied with the VCN AC.

To connect the VCN AC to the patch-panel, perform the following steps:

Connect the RJ-21 connector labeled “FROM VCN AP” at the back of the

VCN AC to the “FROM VCN AP” connector on the front of the patch panel using one of the 50-pin twisted pair flat cables.

Connect the RJ-21 connector labeled “TO PBX” at the back of the VCN

AC to the “TO PBX” connector on the front of the patch panel using the second 50-pin twisted pair flat cable.

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