Nortel TDM Recorder, Installation Manual

Page: 30 / 128

Recorder Hardware Installation Standard 3.0
30 Nortel TDM Recorder
Using dual punch-down blocks
With dual punch-down blocks the PBX signal is duplicated by wiring each
channel on the main punch-down block to a second punch-down block that
connects to the NGX.
Use this configuration if you have no access to alter the PBX signal path
(which means you cannot use a Y-Splitter) or if you are not able to
reconfigure the punch-down block that routes the PBX to the phones (which
means you cannot use Bridge Clips).
Using standard twisted pair wire, each channel is connected to an additional
punch-down block that the NGX can connect to through either an RJ-21X
connection, or if necessary, by manually breaking out the HD68 cable that
normally connects to the RK-21X connector into its individual lines and
connecting them each to a channel.
PBX
RJ-21 X Cable
Break-out
Punch-down block
NGX Wiring with Dual Punch-down Blocks Scenario
Phones
DETAIL
Twisted
pair to
2nd Block
To
Phones
To
NGX
From PBX
LEGEND:
Standard Twisted
Pair Cable
50-Pin Centronics
ML Cable
RJ-21 X Connector
NGX Voice Card
50-Pin Centronics
ML Cable broken out
to twisted pair