Paradyne 3000 manual Preinstallation Inspection, Modular Circuit Card Installation

COMSPHERE 3000 Series Carrier

The procedures are only for installing the modular and non-modular DSU-TDM or DSU-MCMP circuit cards that are physically attached. For information on adding the TDM or MCMP option onto a modular or non-modular DSU, see the COMSPHERE 3600 Series Data Service Units, Models 3610 and 3611, Time Division Multiplexer, Multichannel Multipoint, and Digital Bridge Options, Applications Guide.

Preinstallation Inspection

Check the circuit card for physical damage. If you are installing a modular circuit card, also check the rear connector plate or connector module for damage. Ensure that the connector pins are not damaged. If the circuit card, rear connector plate, V.35 interconnect cable, or connector module shows signs of damage, report it immediately to your shipping representative and also to your AT&T Paradyne representative.

Modular Circuit Card Installation

Before you begin the modular circuit card installation procedure, you must install the Network Interface Modules (NIMs), if required. For information on how to install a NIM, see the Network Interface Installation section earlier in this chapter.

NOTE

When a TDM or MCMP is installed, there are two circuit cards with two faceplates that are physically attached. The modular DSU-TDM or DSU-MCMP circuit cards occupy two slot positions in the carrier, but they are installed as one. Follow the instructions, keeping in mind that there are two latches and that a 6-port connector module is used instead of a 2-port rear connector plate.

Also, when installing a TDM or MCMP, make sure both modular circuit cards are aligned in their slots before sliding the cards into place.

If installing a DDD NIM and a modular DSU-TDM or DSU-MCMP circuit card, do not install the connector module where it will interfere with the NIM's J3 and J4 modular connectors.

To install a modular circuit card, proceed as follows, referring to the appropriate Installation and Operation or Applications Guide when necessary:

.Procedure

1.At the rear of the carrier, set the tab on the rear connector plate into the slotted groove on the carrier's backplane. If you are installing a connector module, there are two tabs instead of one. Make sure the connector plate uses the same slot position intended for the modular circuit card.

2.Loosely fasten the screw attached to the rear connector plate, allowing for slight adjustment that may be needed when installing the modular circuit card. If you are installing a connector module, there are two screws (which must be alternately fastened) instead of one.

3.Change any default hardware strap settings that may be required before installing the modular circuit card in the carrier. For example, straps that determine:

•Permissive (default) or programmable DDD interface switch.

•Enabled (default) or disabled test mode indication jumper.

4.Using a Phillips screwdriver, loosen the screw holding the circuit pack lock and rotate the lock to the open position (refer to Figure 3-16). Open the latch.

5.At the front of the carrier, hold the modular circuit card vertically with the latch on its faceplate in the open position. Then, insert the circuit card into the top and bottom circuit card guides (Figure 3-37).

Slide the modular circuit card into the slot, aligning the circuit card with the rear connector plate, until the connectors seat firmly into the back of the carrier. Remember, if you are installing a TDM or MCMP, there are two modular circuit cards and a connector module instead of one modular circuit card and a rear connector plate. Press the faceplate latch to secure the circuit card into the rear connector plate, rotate the circuit pack lock into the closed position (refer to Figure 3-16), and tighten the screw.

If the carrier's power transformer unit is operating, the unit performs a self-test routine. After several seconds, the modular circuit card completes its power-up self-test in which all faceplate LEDs light. If the circuit card fails the self-test, the Alrm LED on the faceplate flashes.

3-50 December 1994 3000-A2-GA31-80