7
Connecting the Model 3550 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.
Follow these steps.
Procedure
1. Plug the DDS network interface cable into the DSU jack labeled LINE.
— U.S.

– select either end of the cable
— Canada – select the 8-pin end
2. Plug the other end of the cable into the modular jack (USOC RJ48S) provided by
the circuit provider.
If the remote DSU is also connected to the network, the DSU’s green OK indicator lights
and the Alrm indicator goes off. The Health and Status screen no longer displays a

No Signal

message.
If connecting the DSU to a LADS network, note that there are distance limitations that
govern the use of DSUs on the network. See the User’s Guide for specific information.