Specifications

Copyright © AMETEK
27
27.1 Description
The DCU module is a DDS (Digital Data Service)
channel module. It provides the interface between
a DS0 timeslot of a T1 stream and a 4-wire
metallic wire network. For example, you would
use a DCU module between your FOCUS system
and a CSU/DSU controlled circuit, or another
FOCUS chassis with a DCU module connected to
a metallic wire network.
Typical devices you can connect to the module
include:
• CSU/DSU
• Any AMI compliant device
•Verilink Router
•WAN/LAN
27.2 Connection
Typically the appropriate cable will accompany
the equipment you wish to connect to the DCU.
Simply plug the telecom equipment into the RJ-48
connector on the interface. Please refer to Fig. 27-
1 for the pinout.
27.3 Installation
As with other FOCUS modules, we recommend
that you initially install and test the DCU module
and interface in a “test” chassis (i.e., one that is
not part of an operating network). This way, you
can quickly perform the acceptance test without
interfering with a live network. Whether you are
installing the module in a test chassis or a chassis
that is on line in a network, use the installation
procedure described here.
The DCU module occupies one chassis slot and
one time slot (DS0). Before installing the module
and its interface, make sure that:
• The FOCUS chassis is set up, energized,
and operational, with all necessary
common equipment (see Chapter 3)
• The FOCUS Configuration Software (FCS
version 3.10 or greater) has been installed
on your computer (see Chapter 3)
• Acceptance tests for the FOCUS chassis
and all previously installed equipment have
been done to rule out invalid test results for
this module
• FCS is up and running (see the FCS online
help facility: FOCUS Configuration
Software > Starting FCS)
27.3.1 Hardware Installation and
Connections
To install the DCU module and interface,
complete the following steps.
1. Bring the FOCUS chassis “on line”.
Click on the “Online” speed button
.
This uploads to the FCS the current status,
settings, operating statistics, etc., for the
FOCUS chassis.
2. Unlock the FOCUS chassis.
If the chassis is locked, execute the “Unlock
Configuration” command on the FCS Setup
menu or click on the “Unlock FOCUS
Chassis” speed button .
This puts the chassis into a configurable state.
3. Insert the Module into the FOCUS chassis.
Carefully insert the DCU module into the top
and bottom grooves of an open slot in the
FOCUS chassis. Slide it all the way in until it
is well seated in the slot. Lock it into place
using the black ejector clip on the front of the
module.
When you first insert the module, the
red/green status LED is red. If the module is
functional, the status LED turns green within
20 seconds. If the module is non-functional,
or the chassis is locked, the status LED will
remain red.
27. Data Channel Unit (DCU) Module