Bay Networks 5393 Hardware Installation Manual page 84

Chapter 3 ROM Monitor Commands
3-8 Remote Annex 5393/PRI Hardware Installation Guide
When the Remote Annex begins to boot, it displays the load server
host's Internet address. If the unit does not boot successfully after
several attempts, it displays a boot attempt failed message; if the unit
has opened the boot file and an error occurs during the boot process,
it displays a boot error report on the service port terminal and returns
to the ROM Monitor. The boot error report can help determine the
cause of the boot failure (see Boot Error Report on page 4-9).
During a boot, the service port terminal may display four possible
status symbols: "." indicates received data blocks, "?" indicates
unanswered requests, "*" indicates transmission errors, and "!
~XXXX~" is a status word from the Ethernet chip on the Annex
indicating a gross problem with the Ethernet connection (if this
symbol appears in your boot command display, contact technical
support).
The status word "! ~XXXX~", where XXXX are four hexadecimal
digits, decodes as follows:
8000 = Command complete
4000 = Chip is busy
2000 = Command completed without error
1000 = Command aborted issuance of an ABORT command
800 = Late collision detected
400 = Carrier lost
200 = CTS lost
100 = DMA underrun
80 = Transmission deferred because link was busy
40 = Collision detected during interframe spacing (SQE/Heartbeat
detected)
20 = Excessive collisions
10 = Reserved
The lowest nibble (bits 3 to 0) are a count of collisions during this
transmission. For example:
~8802~ = Complete, Late collision, 2 collisions
~8841~ = Complete, Late Collision, SQE detected, 1 collision