Chapter 1. Introduction
1-4 Dual Nx56/64 Option Module User Manual 61200142L1-1
Inband Communication Channel
Enabled or Disabled
Physical DescriptionThe Dual Nx56/64 V.35 option module plugs into the op-
tion slot in the rear of the TSU/TDU/ESU family of prod-
ucts (see Figure 1-1).
The rear panel of the option module includes a plastic
plug over a cutout for a second V.35 connector. This al-
lows a Dual Nx56/64 V.35 plug-on board (or any other
plug-on board) to be added to the Dual Nx56/64 option
module, creating a multiport module. The PORT X.1 and
X.2 indication is linked to the port numbering philoso-
phy of the TSU/TDU/ESU product family. The X repre-
sents the slot number into which the option module is
plugged.
For the TSU 1X0 there is only one option slot. Therefore
the port designations are 1.1, 1.2 and, if a Dual Nx56/64
Plug-On V.35 option module is present, ports 1.3 and 1.4.
The numbers appear in the front panel LCD menu dis-
plays.
Figure 1-1. Dual Nx56/64 V.35 Option Module
PORT X.3
PORT X.2
PORT X.1
DUAL
NX 56/64
1 - Cutout for second V.35 connector
2 - Screw receptacles for plug-on board
3 - Plug-on board header
1
2
3
2