Display T1 Alarms and Errors

Action

To display T1 alarms and errors, use the following JUNOS command-line interface (CLI) operational mode command:

user@host> show interfaces t1-fpc/pic/port extensive

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

What It Means

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 11 lists the T1 media-specific alarms or defects that can render the interface unable to pass packets.

Table 11: 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