Paradyne 3551 manual How to Change Hardware Straps, Procedure

COMSPHERE 3550 Series Data Service Units

circuit must be capable of supplying a minimum of 2 amperes at 115 Vac. Refer to the Technical Specifications section in Chapter 1 for additional power requirements.

CAUTION

The ac transformer contains a

3-wire grounding-type plug which has a grounding pin. This is a safety feature. Do not defeat the purpose of the grounding plug by modifying it or by using an adapter.

Prior to installation, use an outlet tester to check the ac receptacle for earth ground. If the power source does not provide a ground connection, consult an electrician to determine another method of grounding the DSU before proceeding with the installation.

Before connecting the DSU, you need to contact the telephone company to coordinate your installation before connecting the DSU to their network. The DSU can only be operated at the data rate for which access to the DDS network is provided. If a DBM is installed, the DSU must also be connected to the dial network. You must notify the telephone company before you connect to the dial network. Refer to the notice at the front of this guide to ensure compliance with FCC, Bell Canada, and Canadian DOC rules.

No on-site assembly of the DSU is required. However, installation should not proceed if any of the following is missing:

•A power cord with table-top ac transformer

•A 14-ft cable for connection to the DDS network, with 8-pin RJ48S modular plug on each end

For Canadian purchasers, an 8-pin RJ48S connector is on one end while a 6-pin connector is on the other is required (order feature number 3000-F1-006).

If the DSU is equipped with a DBM, a dial interface cable should have been ordered.

•Permissive (RJ11C) ± a 6-pin modular plug at each end (feature number 4400-F1-53x or 3600-F3-503).

•Programmable (RJ45S) ± an 8-pin modular plug at each end (feature number 4400-F1-54x).

Contact your service representative if any of these

items is missing from the shipping container, or to order the appropriate dial interface cable.

If your DSU is equipped with a DBM, you may need to change the DSU's hardware straps before installing the DSU.

How to Change

Hardware Straps

HANDLING PRECAUTIONS

FOR

STATIC-SENSITIVE DEVICES

This product is designed to protect sensitive components from damage due to electrostatic discharge (ESD) during normal operation. When performing installation procedures, however, take proper static control precautions to prevent damage to equipment. If you are not sure of the proper static control precautions, contact your nearest sales or service representative.

The Model 3550 DSU has a switch located behind its diagnostic control panel (DCP). This switch contains two straps, one that controls the permissive or programmable connection when a DBM is installed, and one that controls the frame-to-signal grounds. Table 2-1 shows the DSU's settings. Refer to Figure 2-1 and the following steps if you need to change one of these straps.

.Procedure

1.With your thumbs under the edge of the front bezel, firmly press upward to lift the bezel from the tabs securing it in place.

2.Swing the front bezel up and set the bezel aside.

3.Refer to Table 2-1 to determine which switch needs to be changed. Then, using a small instrument, carefully change the position of the switch.

4.Reinsert the front bezel's hinge tabs into position and swing the bezel down. Snap the bezel back into place.

2-2 December 1996 3550-A2-GB20-20