Specifications

4-8

Cisco BPX 8600 Series Installation and Configuration

Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001

Chapter 4 BNI (Trunk) Cards

T3 and E3 Line Modules (LM-3T3 and LM-3E3)

The Line Modules for the BNI-T3 and BNI-E3 front cards are back cards used to provide a physical

interface to the transmission facility. The LM-3T3 is used with the BNI-T3. The LM-3E3 with the

BNI-3E3.

The Line Module connects to the BNI through the StrataBus midplane. You can make two adjacent

cards of the same type redundant by using a Y-cable at the port connectors. All three ports on a card

must be configured the same.

Refer to Figure 4-4, Figure 4-5, and Table 4-3 which describe the faceplate connectors of the LM-3T3

and LM-3E3. There are no controls or indicators.

The LM-3T3 and LM-3E3 provides these features:

• BNC connectors for 75-ohm unbalanced signal connections to the transmit and receive of each of

the three ports.

• Transformer isolation from the trunk lines.

• Metallic relays for line loopback when in standby mode.

A final node loopback is at the end of the LM-3T3 or LM-3E3 card. This is a metallic loopback path

that uses a relay contact closure. It is a near-end loopback path only; the signal is looped at the final

output stage back to circuits in the node receive side. It is operated only when the corresponding front

cardisinstandby.

Table 4-2 BNI Front Panel Card Failure Indications

act stby fail Failure Description

on off on Non-fatal error detected; the card is still active.

off on on Non-fatal error detected; the card is in standby mode.

off blinking on Fatal error detected; the card is in a reboot mode.

on on on The card failed boot load and operation is halted.

Table 4-3 LM-3T3 and LM-3E3 Connectors

No Connector Function

1 PORT 1 RX - TX BNC connectors for the transmit and receive T3/E3 signal to/from

ATM trunk 1.

2 PORT 2 RX - TX BNC connectors for the transmit and receive T3/E3 signal to/from

ATM trunk 2.

3 PORT 3 RX - TX BNC connectors for the transmit and receive T3/E3 signal to/from

ATM trunk 3.