Paradyne 3550, 3551 Connecting the Model 3551 DSU to the NMS, Connecting the Model 3551 DSU to the Dial Network (PSTN), Connecting the Model 3551 DSU to the DDS (or LADS) Network, Connecting the Model 3551 DSU to a DTE

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

, 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

for additional information or to install the NIM.

Connecting the Model 3551 DSU to the DDS (or LADS) Network

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

for installation procedures.