Paradyne 3551 manual Before You Begin

COMSPHERE 3550 Series Data Service Units

Before You Begin

The COMSPHERE 3000 Series Carrier should already be installed properly and be operational, with a functioning shared diagnostic control panel (SDCP). An SDCP (installed in the carrier) is required for installation and maintenance of the Model 3551 DSU. For installation information, see the COMSPHERE 3000 Series Carrier, Installation Manual.

A fan module may also be needed to dissipate heat. Refer to the Fan Module Installation section in Chapter 3 of the COMSPHERE 3000 Series Carrier, Installation Manual to determine whether a fan is required.

The distance between your DTE and the DSU must be within EIA-232-D/V.24 or V.35 limits.

•For the EIA-232 connector, the typical maximum distance is 50 feet at speeds less than or equal to 19.2 kbps. If a longer distance is needed, use high quality, low capacitance cable and ensure that the effective shunt capacitance of the circuit (measured at the DSU and including the capacitance of the cable and the DTE) does not exceed 2500 picofarads, as specified in EIA-232-D.

•For the V.35 connector, the recommended maximum distance between a DTE and DSU is nominally 1000 feet.

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.

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 3551 DSU has several hardware straps that control the permissive or programmable connection when a DBM is installed, the Test Mode Indication leads, and the external interface leads (used with a ±48 Vdc Central Office Power Unit).

Refer to Figure 3-1 to locate the switch and jumper locations. If a DBM is installed, refer to Table 3-1 to determine which switch needs to be changed, if any. Refer to Table 3-2 to determine whether these jumper straps need to be changed.

3-2 December 1996 3550-A2-GB20-20