4-8 Cisco BPX 8600 Series Reference
T3 and E3 Line Modules (LM-3T3 and LM-3E3)
Table 4-2 BNI Front Panel Card Failure Indications
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 4-3 which 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.
• 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
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.
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.
