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Connecting the Model 3551 DSU to the NMS
A Model 3551 DSU is set up for network diagnostic connection through the shared
diagnostic unit (SDU), which is installed in Slot 0 of the carrier. Refer to the
COMSPHERE 3000 Series Carrier Installation Manual
, Document No. 3000-A2-GA31,
to set up the network diagnostic connection.
For connection of the DSU, or for pin assignments, see the User’s Guide.
Connecting the Model 3551 DSU to the Dial Network (PSTN)
Connection to the dial network (or public switched telephone network) for the
carrier-mounted Model 3551 DSU is through a network interface module (NIM) that is
installed onto the carrier’s backplane. Refer to the
COMSPHERE 3000 Series Carrier
Installation Manual
for additional information or to install the NIM.
Connecting the Model 3551 DSU to the DDS (or LADS) Network
NOTE:
Before connecting the DSU to the DDS network, ensure that approved primary
protectors have been installed on the circuit in accordance with Article 800 of the
National Electric Code, NFPA 70, in the United States and Section 60 of the
Canadian Electric Code, Part 1, in Canada.
If connecting the DSU to a LADS network there are distance limitations that govern the
use of DSUs on the network. See the User’s Guide for specific information.
The DDS network interface is provided by two RJ48T 50-pin connectors on the back of
the carrier. Each connector serves eight contiguous slots in the carrier: one for Slots 1
through 8 and one for Slots 9 through 16.
Connecting the Model 3551 DSU to a DTE
The DTE interface for the Model 3551 DSU is provided through its rear connector plate.
Each rear connector plate contains two DB25 (or 25-pin D-type) connectors. The top
connector is an EIA-232-D/V.24 (ISO 2110) connector. The bottom connector is an
ITU-T V.35 (ISO 2593) connector.
To use the 25-pin V.35 connector (used for speeds greater than 19.2 kbps), a V.35
adapter is needed (Feature Number 3000-F1-510). The adapter provides the interface
between the 25-pin V.35 D-type connector and a V.35 DTE cable.
Each DSU can be configured to use either interface (EIA-232 or V.35) independent of
other DSUs in the carrier. Connection of the DSU to the DTE is a matter of selecting
and installing the appropriate cable. Refer to the
COMSPHERE 3000 Series Carrier
Installation Manual
for installation procedures.