Paradyne 3551 manual Connecting the DSU to a DTE, Connecting to DDS or Lads Network

Installing the Model 3551 DSU

Connecting 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. Table 2-2 in Chapter 2 summarizes these limitations.

The DDS network interface is provided by two RJ48T

50-pin connectors on the back of the carrier (refer back to Figure 3-2, DDS Interface). Each connector serves eight contiguous slots in the carrier: one for Slots 1 through 8 and one for Slots 9 through 16.

Appendix E provides connectivity diagrams should you need further assistance in connecting the DSU to the network.

Connecting the 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 a CCITT V.35 (ISO 2593) connector.

To use the 25-pin V.35 connector (used for speeds greater than 19.2 kbps), a V.35 interconnect cable is needed (feature number 3000-F1-510). This cable 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.

Appendix E provides connectivity diagrams should you need further assistance in connecting the DSU to the network.

Addressing the Unit

A unique address must be assigned to each control and tributary DSU in your network. You can assign an address within the range of 1 through 255.

NOTE

Do not assign the number 192 as a network address. This number is reserved as a broadcast address.

If a DBM is installed, it requires a separate address which is automatically assigned by the DSU. The address assigned a DBM is the DSU's address, plus 1 (e.g., if the DSU's address is 1, the assigned DBM address will be 2).

NOTE

The numbers 191 and 255 cannot be assigned to a DSU that has a DBM. However, addresses can be assigned in any order; they do not have to be sequential.

It is recommended that only odd- numbered addresses be assigned to DSUs so that even-numbered addresses are reserved for DBMs. If your network does not currently include DBMs, you retain the flexibility to add them later without having to reconfigure your entire network.

3550-A2-GB20-20 December 1996 3-9