3Com DSA-3CV1100-02 service manual Installing the VCN Access Concentrator

Installing the VCN Access Concentrator 27

Figure 12 VCN Access Point Punch-down Block Installation without a Patch Pane

Extension 1

W ire pair connected to VCNAP

W ire pair not connected to VCNAP

Ext. 1
+ D ata	Punch-Down Blocks

VCNAP punch-down

block

Extension 2

V C N A P

Ext. 2

PBX

PBX punch -down

block

Ro om B asem ent

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.

4Repeat 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.

Installing the VCN

Access

Concentrator

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.