Extension Cabling - NEC Xen Topaz System Hardware Manual

September 2004
28 -

1.4 Extension Cabling

1. Open the Sub-Cover.
2. Insert the modular plugs of the extension line cords (2-wire / 4-wire)
into the Extension Modular Jacks on the system.
1. Both the inner pair (voice) and outer pair (data) of the hybrid
multiline terminal cabling are polarity conscious.
2. When installing an analogue device onto a hybrid extension port,
use only a 2-wire connection to the centre pair of pins. Do not
connect all 4 wires from the hybrid port to the analogue device.
Some analogue devices such as facsimile machines and modems,
use a "Mode 3" pin configuration (i.e., pin 2 connected to pin 3 and
pin 4 is connected to pin 5). Connecting all four wires to such
devices could result in a non-functioning port or damage to the
analogue device.
IMPORTANT
Trunk/Extension Cabling and Installing the Expansion PCBs
NEC Business Solutions Ltd