Specifications

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Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
OL-1166-04
Chapter 2 Cisco IGX 8400 Series Cards
Network Trunk Module
NTM E1 Interface Back Card
The NTM E1 interface card (BC-E1) terminates an E1 trunk line on the NTM front card, and provides
the following features:
• Physical interfaces to CEPT E1 lines (CCITT G.703 specification)
• 120-ohm (balanced) or 75-ohm (balanced or unbalanced) physical interfaces
• Support for HDB3 or AMI
• Configurable full or fractional E1 lines
• Communication of E1 line events to the NTM front card
• Detection of loss of FastPacket synchronization
• CRC-4 error checking
• Configurable clock modes—normal clocking and loop timing
Figure 2-9 and Table 2-11 provide descriptions of the BC-E1 status LEDs and connectors on the BC-E1
faceplate.
Table 2-10 BC-T1 Back Card Faceplate LEDs
LED Meaning
LOS (red) Loss of signal at the local end of the trunk.
Alarm LED (red) Loss of local T1 frame alignment or loss of FastPacket alignment on the
local end of the trunk.
Alarm LED (yellow) Loss of remote T1 frame alignment or loss of FastPacket alignment on the
remote end of the trunk.
AIS (green) Presence of an unframed sequence of all-ones on the T1 line.
Table 2-11 BC-E1 Back Card LEDs
LED Meaning
LOS Loss of signal at the local end.
Alarm LED (red) Loss of local frame alignment or FastPacket alignment on the local end.
Alarm LED (yellow) Loss of remote frame alignment or FastPacket alignment on the remote end.
AIS (green) Presence of unframed all-ones on the E1 line.
MFRA (red) Loss of multiframe alignment on the local end.
MFYA (yellow) Loss of multiframe alignment on the remote end.