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Broadband Network Interface Cards (BNI-T3 and BNI-E3)
Internally, the PLPP circuit in the BNI-T3 has several loopbacks for use by diagnostic routines. These
loopbacks loop the signal in both directions, toward the StrataBus as well as toward the output.
Therefore, they can be used to support both near-end and far-end maintenance loopback testing:
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When a trunk has been assigned to a BNI card but is not yet activated (upped), it is put in a loopback
mode and a diagnostic test is continuously performed. This loopback is disruptive so it cannot be
performed on a card that has an active trunk. This diagnostic test checks the data path through the BNI
out to the BCC, through the switch matrix, and back to the BNI.
Active trunks are constantly checked by the Communications Fail test routine which is part of system
software.
Front Panel Indicators
The lower section of the BNI front panel (see Figure 4-3) has a three-section, multicolored LED to
indicate the card status. The card status LED is color-coded as indicated in Table 4-1.
At the upper portion of the front panel, there is a three-section multicolored LED to indicate the status
of the three ports on the BNI. Types of failures are indicated by various combinations of the card status
indicators as indicated in Table 4-2.
Table 4-1
Status
Port
Card
Cisco BPX 8600 Series Installation and Configuration
4-6
A digital loopback at the DS3 or E3 transmitter/receiver
This checks both the transmit and receive signal paths in the near-end BNI card.
A digital loopback capability on the BNI-3T3 to the PLPP processor
This is used for the internal self test to basically check the operation of the signal processor.
BNI Front Panel Status Indicators
LED color
Status Description
off
Trunk is inactive and not carrying data.
green
Trunk is actively carrying data.
yellow
Trunk is in remote alarm.
red
Trunk is in local alarm.
green (act)
Card is on-line and one or more trunks on the card have been upped. If
off, card may be operational but is not carrying traffic.
yellow (stby)
The card is offline and in standby mode (for redundant card pairs). It
might not have any upped trunks. If blinking, indicates card firmware
or configuration data is being updated.
red (fail)
Card failure; the card has failed self-test and/or is in a reset mode.
Chapter 4
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
BNI (Trunk) Cards
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Troubleshooting
