6
5. At the front of the carrier, hold the DSU vertically with the latch on its faceplate in
the open position. Then, insert the circuit card into the top and bottom circuit card
guides for the slot that contains the rear connector plate.
6. Aligning the circuit card with the rear connector plate, slide the DSU into the slot
until the connectors seat firmly into the back of the carrier.
7. Press the faceplate latch to secure the DSU in the carrier, rotate the circuit pack
lock into the closed position, and tighten the screw.
If the carrier is powered, all indicators on the faceplate flash as the DSU performs
an internal power-on self-test. The green OK indicator then lights for about 20
seconds, then the red OS/NS flashes. If no indicators light, verify that the DSU is
receiving power.
8. Return to the rear of the carrier and tighten the rear connector plate screw.
9. At the rear of the carrier, connect the DTE interface cable onto the rear connector
plate.
If using an EIA-232-D interface cable, connect the EIA-232-D cable to the top DTE
connector on the rear connector plate.
Installation of the DSU and its rear connector plate is complete.
Connecting to a V.35 Interface
To connect a V.35 interface cable:
Procedure
1. Connect the 25-pin end of the V.35 adapter to the bottom DTE connector on the
rear connector plate. Tighten the thumbscrews on both sides of the connector.
2. Connect the 34-pin end of the V.35 adapter to the DTE’s V.35 interface cable.
Tighten the screws on both sides of the connector.
Installation of the V.35 interface cable is complete.
NOTE:
For the V.35 connector, the recommended maximum distance between a DTE and
a DSU is 1000 feet. For the EIA-232 connector, the effective shunt capacitance of
the circuit measured at the DSU, including the capacitance of the cable and the
DTE, must not exceed 2500 picofarads, as specified in EIA-232-D.