Display T1 Alarms and Errors
Purpose
To display T1 alarms and errors, use the following Junos OS command-line interface (CLI) operational mode command:
Action
Sample Output
user@host> show interfaces t1-1/1/0 extensive Physical interface: t1-1/1/0, Enabled, Physical link is Down
Interface index: 24, SNMP ifIndex: 20, Generation: 27
Link-level type: PPP, MTU: 1504, Clocking: Internal, Speed: T1, Loopback: None, FCS: 16, Framing: ESF
Device flags : Present Running Down
Interface flags: Hardware-Down Point-To-Point SNMP-Traps
Link flags : Keepalives
Hold-times : Up 0 ms, Down 0 ms
Last flapped : 2002-01-01 00:00:35 UTC (00:01:00 ago)
Statistics last cleared: 2002-01-01 00:01:03 UTC (00:00:32 ago)
Traffic statistics:
Input bytes : 0 0 bps
Output bytes : 0 0 bps
Input packets: 0 0 pps
Output packets: 0 0 pps
Input errors:
Errors: 0, Drops: 0, Framing errors: 0, Policed discards: 0, L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0,
HS link CRC errors: 0, SRAM errors: 0
Output errors:
Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0
DS1 alarms : LOF, LOS
DS1 defects : LOF, LOS
T1 media: Seconds Count State
SEF 32 0 Defect Active
BEE 0 0 OK
AIS 0 0 OK
LOF 32 0 Defect Active
LOS 32 0 Defect Active
YELLOW 0 0 OK
BPV 0 0
EXZ 0 0
LCV 0 0
PCV 32 10667
CS 0 0
LES 0
ES 32
SES 32
SEFS 32
BES 0
UAS 32
HDLC configuration:
Policing bucket: Disabled
Shaping bucket : Disabled
Giant threshold: 1514, Runt threshold: 3
Timeslots : All active
Line encoding: B8ZS, Byte encoding: Nx64K, Data inversion: Disabled
Buildout : 0 to 132 feet
DS1 BERT configuration:
BERT time period: 10 seconds, Elapsed: 0 seconds
Induced Error rate: 10e-0, Algorithm: Unknown (0)
Packet Forwarding Engine configuration:
Destination slot: 1, PLP byte: 1 (0x00)
CoS transmit queue Bandwidth Buffer Priority Limit
% bps % bytes
0 best-effort 0 0 0 0 low none
1 expedited-forwarding 0 0 0 0 low none
2 assured-forwarding 0 0 0 0 low none
3 network-control 0 0 0 0 low none
Meaning
The sample output shows active alarms and active defects. When a major error (such as an alarm indication signal [AIS]) is seen for a few consecutive frames, a defect is declared within 1 second from detection. At the defect level, the interface is taken down and routing protocols are immediately notified (this is the default). In most cases, when a defect persists for 2.5 seconds plus or minus 0.5 seconds, an alarm is declared.
Notification messages are logged at the alarm level. Depending on the type of T1 alarm, you can configure the craft panel to display the red or yellow alarm LED and simultaneously have the alarm relay activate a physically connected device (such as a bell).
Table 1 lists the T1 media-specific alarms or defects that can render the interface unable to pass packets.
Table 1: T1 Interface Alarms and Error Definitions
T1 Alarm or Error | Definitions |
|---|---|
SEF | Severely errored frame |
BEE | Block error event |
AIS | Alarm indication signal (blue alarm) |
LOF | Loss of frame |
LOS | Loss of signal |
YLW | Yellow alarm |
BPV | Bipolar violation |
EXZ | Excessive zeros |
LCV | Line code violation |
PCV | Path code violation |
CS | Controlled slip |
LES | Line errored seconds |
ES | Errored seconds |
SES | Severely errored seconds |
SEFS | Severely errored frame seconds |
BES | Bursty errored seconds |
UAS | Unavailable seconds |
