Display T3 Alarms and Errors

Action

To display T3 alarms and errors, use the following JUNOS command-line interface (CLI) operational mode command:

user@host> show interfaces t3-fpc/pic/port extensive

Sample Output

user@host> show interfaces t3-1/0/0 extensive

Physical interface: t3-1/0/0, Enabled, Physical link is Down

  Interface index: 9, SNMP ifIndex: 10

  Link-level type: Cisco-HDLC, MTU: 4474, Clocking: Internal

  Speed: T3, Loopback: None, CRC: 16, Mode: C/Bit parity

  Device flags   : Present Running Down

  Interface flags: Hardware-Down Link-Layer-Down Point-To-Point SNMP-Traps

  Link flags     : Keepalives

  Keepalive statistics:

    Input : 116 (last seen 00:02:59 ago)

    Output: 187 (last seen 00:00:09 ago)

  Statistics last cleared: Never

  Traffic statistics:

   Input  bytes  :                 2552                    0 bps

   Output bytes  :                 3703                    0 bps

   Input  packets:                  116                    0 pps

   Output packets:                  161                    0 pps

  Input errors:    

    Errors: 0, Drops: 0, Framing errors: 229, Policed discards: 1

    L3 incompletes: 0, L2 channel errors: 0, L2 mismatch timeouts: 0                                                    

    SRAM errors: 0, HS link CRC errors: 0

  Output errors:                

    Carrier transitions: 4, Errors: 0, Drops: 0, Aged packets: 0

  Active alarms  : LOF, LOS                                - DS-3 active alarms and defects

  Active defects : LOF, LOS

  DS3 Media:            Seconds        Count  State - T3 media-specific errors

    PLL Lock                  0            0  OK

    Reframing               273            2  Defect Active

    AIS                       0            0  OK

    LOF                     273            2  Defect Active

    LOS                     273            2  Defect Active

    IDLE                      0            0  OK

    YELLOW                    0            0  OK

    BPV                       0            0

    EXZ                       0            0

    LCV                     275     18022125

    PCV                       0            0

    CCV                       0            0

    LES                     275

    PES                     273

    PSES                    273

    CES                     273

    CSES                    273

    SEFS                    273

    UAS                     277

  [...Output truncated...]

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 second plus or minus 0.5 seconds, an alarm is declared.

Notification messages are logged at the alarm level. Depending on the type of T3 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 17 lists the T3 media-specific alarms or errors that can render the interface unable to pass packets.

Table 17: T3 Interface Error Counter Definitions

T3 Alarm or Error	Definition
AIS	Alarm indication signal
EXZ	Excessive zeros
FERF	Far-end failures
IDLE	Idle code detected
LCV	Line code violation
LOS	Loss of signal
LOF	Loss of frame
YLW	Remote defect indication (yellow alarm)
PLL	Phase locked loop