Cisco Systems 8600 Series manual Front Panel Indicators, Loopbacks and Diagnostics

Broadband Network Interface Cards (BNI-T3 and BNI-E3)

Loopbacks and Diagnostics

There are two types of self-tests that may be performed. A non-disruptive self test is automatically performed on a routine basis. A more complete, disruptive test may be initiated manually when a card failure is suspected. If the card self-test detects a failure, the card status LEDs displays an indication of the failure type.

Several loopback paths are provided. A digital card loopback path, used by the node for self-test, loops the data at the serial DS3 or E3 interface back towards the node. A digital line loopback loops the data at the electrical transmitter/receiver at the card output. Internally, the PLPP circuit in the BNI-T3 has several loopbacks for use by diagnostic routines.

There are several loopback paths within the BNI for testing. A digital loopback at the DS3 or E3 transmitter/receiver to check both the transmit and receive signal paths in the near-end BNI card. These loopbacks loop the signal in both directions, towards the StrataBus as well as towards the output. Therefore, they can be used to support both near end and far end maintenance loopback testing. On the BNI-3T3, there is a digital loopback capability to the PLPP processor used for the internal self test to basically check the operation of the signal processor.

Once a trunk has been assigned to a BNI card but before it is made active (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	BNI Front Panel Status Indicators
Status	LED color	Status Description
Port	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.
Card	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)	Card is off-line and in standby mode (for redundant card pairs). May not
		have any upped trunks. If blinking, indicates card firmware or
		configuration data is being updated.
	red (fail)	Card failure; card has failed self-test and/or is in a reset mode.

4-6Cisco BPX 8600 Series Reference