Cisco Systems 8600 Series T3 and E3 Line Modules LM-3T3 and LM-3E3, LM-3T3 and LM-3E3 Connectors

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

Table 4-2	BNI Front Panel Card Failure Indications
act	stby	fail	Failure Description
on	off	on	Non-fatal error detected; card is still active.
off	on	on	Non-fatal error detected; card is in standby mode.
off	blinking	on	Fatal error detected; card is in a reboot mode.
on	on	on	Card failed boot load and operation is halted.

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 and the LM-3E3 with the BNI-3E3. The Line Module connects to the BNI through the StrataBus midplane. Two adjacent cards of the same type can be made 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 4-3which describe the faceplate connectors of the LM-3T3 and LM-3E3. There are no controls or indicators.

The LM-3T3 provides the following features:

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

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Transformer isolation from the trunk lines.

Metallic relays for line loopback when in standby mode.

A final node loopback is found 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 only operated when the corresponding front card is in standby.

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.

4-8Cisco BPX 8600 Series Reference