Locate Multichannel DS3 Alarms and Errors
Checklist for Locating Multichannel DS3 Alarms and Errors
Purpose
To check for the most common Multichannel DS3 alarms and errors encountered when investigating line problems on a Juniper Networks router.
Action
Table 1 provides links and commands for Multichannel DS3 alarms and errors.
Table 1: Checklist for MultichannelDS3 Alarms and Errors
Tasks | Command or Action |
|---|---|
| Display Alarms and Errors for Channelized DS3 to DS1 Interfaces | show interfaces t1-fpc/pic/port:channel extensive |
| Display Alarms and Errors for Channelized DS3 to DS0 Interfaces | show interfaces ds-fpc/pic/port:channel:channel extensive |
Display Alarms and Errors for Channelized DS3 to DS1 Interfaces
Purpose
To display channelized DS3 to DS1 alarms and errors, use the following Junos OS command-line interface (CLI) operational mode command:
Action
Sample Output
user@host> show interfaces t1-2/1/0:19 extensive Physical interface: t1-2/1/0:19, Enabled, Physical link is Up
Interface index: 50, SNMP ifIndex: 59, Generation: 49
Description: Customer
Link-level type: Cisco-HDLC, MTU: 1504, Clocking: Internal, Speed: T1, Loopback: None, FCS: 16,
Mode: M23, Framing: ESF
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps
Link flags : Keepalives
Hold-times : Up 0 ms, Down 0 ms
Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
Keepalive statistics:
Input : 117 (last seen 00:00:08 ago)
Output: 121 (last sent 00:00:01 ago)
Statistics last cleared: 2002-08-01 10:14:45 UTC (00:19:38 ago)
Traffic statistics:
Input bytes : 22459734 236888 bps
Output bytes : 162288645 1322208 bps
Input packets: 201233 214 pps
Output packets: 236341 227 pps
Input errors:
Errors: 0, Drops: 0, Framing errors: 0, Policed discards: 377, 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 : None
DS3 alarms : None
DS1 defects : None
DS3 defects : None
T1 media: Seconds Count State
SEF 0 0 OK
BEE 0 0 OK
AIS 0 0 OK
LOF 0 0 OK
LOS 0 0 OK
YELLOW 0 0 OK
BPV 0 0
EXZ 0 0
LCV 0 0
PCV 0 0
CS 0 0
LES 0
ES 0
SES 0
SEFS 0
BES 0
UAS 0
DS3 media: Seconds Count State
PLL Lock 0 0 OK
Reframing 0 0 OK
AIS 0 0 OK
LOF 0 0 OK
LOS 0 0 OK
IDLE 0 0 OK
YELLOW 0 0 OK
BPV 0 0
EXZ 0 0
LCV 0 0
PCV 0 0
LES 0
PES 0
PSES 0
SEFS 0
UAS 0
Interface transmit queues:
B/W WRR Packets Bytes Drops Errors
Queue0 95 95 234494 162020375 0 0
Queue1 5 5 164 5808 0 0
HDLC configuration:
Giant threshold: 1514, Runt threshold: 3
Timeslots : All active
Line encoding: B8ZS, Byte encoding: Nx64K, Data inversion: Disabled
DS3 BERT configuration:
BERT time period: 0 seconds, Elapsed: 0 seconds
Algorithm: Unknown (0), Induced Error rate: 10e-0
DS1 BERT configuration:
BERT time period: 10 seconds, Elapsed: 0 seconds
Induced Error rate: 10e-0, Algorithm: 2^15 - 1, O.151, Pseudorandom (9)
PFE configuration:
Destination slot: 2, PLP byte: 2 (0xab)
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
Logical interface t1-2/1/0:19.0 (Index 27) (SNMP ifIndex 125) (Generation 26)
Flags: Point-To-Point SNMP-Traps Encapsulation: Cisco-HDLC
Protocol inet, MTU: 1500, Flags: None, Generation: 34 Route table: 0
Addresses, Flags: Is-Preferred Is-Primary
Destination: 192.168.140.196/30, Local: 192.168.140.197, Broadcast: Unspecified, Generation: 44
Meaning
The sample output shows that there are no 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 2 shows T1 media-specific alarms or defects that can render the interface unable to pass packets.
Table 2: T1 Media Alarms and Error Definitions
T1 Media Alarm or Error | Definitions |
|---|---|
AIS | Alarm indication signal (blue alarm) |
BEE | Block error event |
BES | Bursty errored seconds |
BPV | Bipolar violation |
CS | Controlled slip |
ES | Errored seconds |
EXZ | Excessive zeros |
LCV | Line code violation |
LES | Line errored seconds |
LOF | Loss of frame |
LOS | Loss of signal |
PCV | Path code violation |
SEF | Severely errored frame |
SEFS | Severely errored frame seconds |
SES | Severely errored seconds |
UAS | Unavailable seconds |
YLW | Yellow alarm |
See Checklist for T1 Alarms and Errors for more details on T1 alarms and statistics.
Display Alarms and Errors for Channelized DS3 to DS0 Interfaces
Purpose
To display T3 alarms and errors for channelized DS3 to DS0 interfaces, use the following Junos OS CLI operational mode command:
Action
Sample Output
user@host> show interfaces ds-2/1/0:5:1 extensive Physical interface: ds-2/1/0:5:1, Enabled, Physical link is Up
Interface index: 36, SNMP ifIndex: 133, Generation: 35
Description: Customer
Link-level type: Cisco-HDLC, MTU: 1504, Clocking: Internal, Speed: 64kbps, FCS: 16, Mode: M23,
Framing: ESF
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps
Link flags : Keepalives
Hold-times : Up 0 ms, Down 0 ms
Keepalive settings: Interval 10 seconds, Up-count 1, Down-count 3
Keepalive statistics:
Input : 2 (last seen 00:00:05 ago)
Output: 2 (last sent 00:00:05 ago)
Statistics last cleared: 2002-08-01 10:14:45 UTC (00:00:16 ago)
Traffic statistics:
Input bytes : 524 304 bps
Output bytes : 528 304 bps
Input packets: 8 0 pps
Output packets: 8 0 pps
Input errors:
Errors: 0, Drops: 0, Framing errors: 0, Policed discards: 10, L3 incompletes: 0,
L2 channel errors: 0, L2 mismatch timeouts: 0, HS link CRC errors: 0
Output errors:
Carrier transitions: 0, Errors: 0, Drops: 0, Aged packets: 0
DS1 alarms : None
DS3 alarms : None
DS1 defects : None
DS3 defects : None
T1 media: Seconds Count State
SEF 0 0 OK
BEE 0 0 OK
AIS 0 0 OK
LOF 0 0 OK
LOS 0 0 OK
YELLOW 0 0 OK
BPV 0 0
EXZ 0 0
LCV 0 0
PCV 0 0
CS 0 0
LES 0
ES 0
SES 0
SEFS 0
BES 0
UAS 0
DS3 media: Seconds Count State
PLL Lock 0 0 OK
Reframing 0 0 OK
AIS 0 0 OK
LOF 0 0 OK
LOS 0 0 OK
IDLE 0 0 OK
YELLOW 0 0 OK
BPV 0 0
EXZ 0 0
LCV 0 0
PCV 0 0
LES 0
PES 0
PSES 0
SEFS 0
UAS 0
Interface transmit queues:
B/W WRR Packets Bytes Drops Errors
Queue0 95 95 4 336 0 0
Queue1 5 5 1 22 0 0
HDLC configuration:
Giant threshold: 1514, Runt threshold: 3
Timeslots : 1
Byte encoding: Nx64K, Data inversion: Disabled
DS3 BERT configuration:
BERT time period: 0 seconds, Elapsed: 0 seconds
Algorithm: Unknown (0), Induced Error rate: 10e-0
DS1 BERT configuration:
BERT time period: 0 seconds, Elapsed: 0 seconds
Induced Error rate: 10e-0, Algorithm: 2^15 - 1, O.151, Pseudorandom (9)
PFE configuration:
Destination slot: 2, PLP byte: 2 (0x2f)
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
Logical interface ds-2/1/0:5:1.0 (Index 14) (SNMP ifIndex 134) (Generation 13)
Flags: Point-To-Point SNMP-Traps Encapsulation: Cisco-HDLC
Protocol inet, MTU: 1500, Flags: None, Generation: 20 Route table: 0
Addresses, Flags: Is-Preferred Is-Primary
Destination: 192.168.118.96/30, Local: 192.168.118.97, Broadcast: Unspecified,
Generation: 22
Meaning
The sample output shows that there are no active alarms and active defects. When a major error (such as an 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 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).
 | Note: T3 is a general term used to refer to the transmission of 44.736-Mbps digital circuits over any media. T3 can be transported over copper, fiber, or radio. DS3 is the term for the electrical signal found at the metallic interface for this circuit where most of the testing is performed. |
T1 Media Alarms and Error Definitions shows T3 media-specific alarms or errors that can render the interface unable to pass packets.
Table 3: 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 |
See Checklist of Common T3 Alarms and Errors for more details on T3 alarms and statistics.
