1) The PM3 MIB will show line up even when the D channel is down.
There is no way to test the D channel status via SNMP. In fact, "show
isdn" lies too. It shows D0 up when it isn't
show isdn
D Ports State L1 L2 Change init Up Down
-- ------- ------------- ------- ----- ----- -----
0 S0-S22 UP Starting 0 7493 1 7491
1 S24-S46 UP Active 1days 1 1 0
2) The PM3 will report the T1 up even if an alarm is in progress. The
output of "show line0" says a yellow alarm is in progress but the line
is up. This one is an impossible condition. Any current alarm idicates
the line is down.
---------------------- line0 - T1 Primary Rate ISDN ---------------
Status: UP Framing: ESF Encoding: B8ZS PCM: u-law
Receive Level: +2dB to -7.5dB
Alarms Violations
----------------------------- -----------------------------
Blue 5 Bipolar 0
*Yellow 6 CRC Errors 32
Receive Carrier Loss 0 Multiframe Sync 7975
Loss of Sync 6
3) There is no way to test Alarm status via SNMP. You can read the
counters but you can't tell if the alarm is in progress or not
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