Cisco T1 User manual

48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS
XE Fuji 16.7.x (Cisco NCS 4200 Series)
First Published: 2017-11-22
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©2017 Cisco Systems, Inc. All rights reserved.

CONTENTS
Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module 1
CHAPTER 1
Information About T1/E1 Interfaces 1
Overview of T1/E1 Interfaces 1
Restrictions for Configuring T1/E1 Interfaces 1
How to Configure T1/E1 Interfaces 2
Setting the Card Type 2
Configuring the Controller 2
Verifying the Controller Configuration 3
Configuring Structure-Agnostic TDM over Packet - T1/E1 Interfaces 3
Verifying CEM Configuration for SAToP 3
Performance Monitoring 4
Circuit Emulation Service over Packet-Switched Network 4
Restrictions for CESoPSN on T1 Interface 5
Configuring CEM Group for CESoPSN on T1 Interface 5
Verifying CEM for CESoPSN on T1 Interface 6
Troubleshooting T1/E1 Controllers 7
Running Bit Error Rate Testing for SAToP 7
Configuring BERT for SAToP 8
Bit Error Rate Testing for CESoPSN 9
Restrictions for BERT in CESoPSN 9
Configuring BERT for CESoPSN 10
Verifying BERT Configuration for CESoPSN 10
Loopback on T1/E1 Interfaces 11
Configuring Loopback 12
Associated Commands 13
Additional References for Configuring 48-Port T1/E1 CEM Interface Module 14
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Overview of Circuit Emulation 17
CHAPTER 2
Configuring Pseudowire 17
Information About Pseudowire 17
Restrictions for CEM 17
Overview of Pseudowire 18
How to Configure Pseudowire 18
Structure-Agnostic TDM over Packet 18
Circuit Emulation Service over Packet-Switched Network 21
Associated Commands 24
Additional References for Configuring Pseudowire 25
Alarm History 27
CHAPTER 3
Alarm History Restrictions 27
Configuring Alarm History 28
Verification of Alarm History Configuration 28
Associated Commands 29
Additional References for Alarm History 29
Clock Recovery System for SAToP 31
CHAPTER 4
Finding Feature Information 31
Information About Clock Recovery 31
Adaptive Clock Recovery (ACR) 31
Differential Clock Recovery (DCR) 32
Benefits of Clock Recovery 32
Prerequisites for Clock Recovery 33
Restrictions for Clock Recovery 33
How to Configure ACR and DCR 33
Configuring ACR for T1/E1 33
Configuring Adaptive Clock Recovery of T1/E1 Interfaces for SAToP 33
Configuring DCR for T1/E1 34
Configuring Differential Clock Recovery of T1/E1 Interfaces for SAToP 34
Configuring Network Clock 36
Verifying Network Clocking Configuration 36
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Contents

Associated Commands 36
Additional References for Clock Recovery 37
Clock Recovery System for CESoPSN 39
CHAPTER 5
Finding Feature Information 39
Information About Clock Recovery 39
Clock Recovery System in CESoPSN 39
Adaptive Clock Recovery in CESoPSN 39
Differential Clock Recovery in CESoPSN 40
Benefits of Clock Recovery 41
Prerequisites for Clock Recovery 41
Restrictions for Clock Recovery 41
How to Configure ACR and DCR 42
Configuring ACR for T1/E1 42
Configuring Adaptive Clock Recovery of T1/E1 Interfaces for SAToP 42
Configuring DCR for T1/E1 43
Configuring Differential Clock Recovery of T1/E1 Interfaces for SAToP 43
Configuring Network Clock 44
Verifying Network Clocking Configuration 45
Associated Commands 45
Additional References for Clock Recovery 46
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48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
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Contents

CHAPTER 1
Configuring T1/E1 Interfaces on 48-Port T1/E1
Interface Module
This chapter provides information about configuring the T1/E1 interfaces on the 48-Port T1/E1 interface
module:
Effective Cisco IOS XE Release 16.5.1S, E1 interface is supported.
T1/E1 is supported only on Cisco NCS 4206 and Cisco NCS 4216.
Note
•Information About T1/E1 Interfaces, on page 1
•How to Configure T1/E1 Interfaces, on page 2
•Circuit Emulation Service over Packet-Switched Network, on page 4
•Troubleshooting T1/E1 Controllers, on page 7
•Associated Commands, on page 13
•Additional References for Configuring 48-Port T1/E1 CEM Interface Module , on page 14
Information About T1/E1 Interfaces
The following sections provide information about T1/E1 interfaces.
Overview of T1/E1 Interfaces
The 48-Port T1/E1 interface module on CEM line card supports generic single or dual-port T1/E1 trunk
interfaces for voice, data, and integrated voice or data applications.
Restrictions for Configuring T1/E1 Interfaces
• You can configure CEM to support serial interface configuration.
• The supported BERT patterns are 1s, 2^11, 2^15, 2^20-O153, 2^20-QRSS, and 2^23.
48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
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How to Configure T1/E1 Interfaces
This section provides information about configuring T1/E1 interfaces on the 48-Port T1/E1 interface module
Recommended Pattern for Lincecode
The following pattern for linecode confirguration is supported for DS1/E1.
Random PatternT1/E1Linecode ConfigurationPart Number
QRSST1B8ZS/AMIXRT83VSH316 LIU
PRBS15E1HDB3/AMI
Setting the Card Type
To set the card type for the T1/E1 interfaces, complete these steps:
enable
configure terminal
card type t1/e1 0 0
exit
Configuring the Controller
To configure T1 interface, use the following commands:
enable
configure terminal
controller t1 0/3/0
clock source internal
framing esf
cablelength short 110
linecode b8zs
no shut
exit
For T1 interface, the default frame mode is Extended Super Frame (ESF).
Note
To configure E1 interface, use the following commands:
enable
configure terminal
controller e1 0/3/0
clock source internal
framing crc4
linecode hdb3
no shut
exit
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
How to Configure T1/E1 Interfaces

For E1 interface, the default frame mode is Cyclic Redundancy Check 4 (CRC4).
Note
Verifying the Controller Configuration
Use the show controllers command to verify the controller configuration:
Router# show controller t1 0/0/0
T1 0/0/0 is up.
Applique type is NCS4200-48T1E1-CE
Cablelength is short 110
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Framing is unframed, Line Code is B8ZS, Clock Source is Internal.
Data in current interval (230 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 9 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
Configuring Structure-Agnostic TDM over Packet - T1/E1 Interfaces
To configure Structure-Agnostic TDM over Packet (SAToP), use the following commands:
enable
configure terminal
controller t1/e1 0/0/0
cem-group 0 unframed
exit
interface CEM 0/0/0
cem 0
xconnect 10.10.10.10 200 encapsulation mpls
exit
To configure SAToP, the framing mode for the port is set to unframed.
Note
Verifying CEM Configuration for SAToP
Use the following command to verify the CEM configuration for T1/E1 interfaces:
Router# show cem circuit interface CEM 0/0/0
CEM0/0/0, ID: 0, Line: UP, Admin: UP, Ckt: ACTIVE
Controller state: up, T1/E1 state: up
Idle Pattern: 0xFF, Idle CAS: 0x8
Dejitter: 5 (In use: 0)
Payload Size: 192
Framing: Unframed
CEM Defects Set
None
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Verifying the Controller Configuration

Signalling: No CAS
RTP: No RTP
Ingress Pkts: 475471 Dropped: 0
Egress Pkts: 475471 Dropped: 0
CEM Counter Details
Input Errors: 0 Output Errors: 0
Pkts Missing: 0 Pkts Reordered: 0
Misorder Drops: 0 JitterBuf Underrun: 0
Error Sec: 0 Severly Errored Sec: 0
Unavailable Sec: 0 Failure Counts: 0
Pkts Malformed: 0 JitterBuf Overrun: 0
Performance Monitoring
You can view the statistics or error count generated on the TDM lines for DS1.
The performance monitoring result is displayed using the show controller command for all the modes. The
following snippets display the performance monitoring details when show controller command is executed:
Router# show controllers t1/e1 0/2/1
T1/E1 0/2/1 is down.
Applique type is NCS4200-48T1E1-CE
Cablelength Short less than 225ft
Receiver has loss of signal.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Framing is ESF, Line Code is B8ZS, Clock Source is Line.
Data in current interval (450 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 449 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
Data in Interval 1:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 900 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
Data in Interval 2:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 485 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 897 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
Total Data (last 2 15 minute intervals):
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 485 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 1797 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
Circuit Emulation Service over Packet-Switched Network
CESoPSN is a method for encapsulating structured (NxDS0) TDM signals as pseudowires over packet
switching networks.
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Performance Monitoring

Restrictions for CESoPSN on T1 Interface
• The maximum number of CEM interface supported is 192.
• The DS0 loopback is not supported on the T1 interface.
• The alarm forwarding is not supported on the T1 interface.
• The card protection is not supported on the T1 interface.
Configuring CEM Group for CESoPSN on T1 Interface
The following section describes how to configure a CEM group for CESoPSN.
To configure xconnect over MPLS, use the following commands:
enable
configure terminal
control t1 0/4/32
cem-group 0 timeslots 1-10
Configure xconnect:
enable
configure terminal
interface cem 0/4/32
cem 0
xconnect 2.2.2.2 10 encapsulation mpls
Perform a similar configuration on the other end of the pseudowire.
show running-config | sec 0/8/16
controller T1 0/8/16
framing esf
linecode b8zs
cablelength short 110
cem-group 0 timeslots 1-10
interface CEM0/8/16
no ip address
cem 0
xconnect 2.2.2.2 10 encapsulation mpls
Check for xconnect configuration using the following command:
Router#show xconnect all | i 0/4/32
UP pri ac CE0/4/32:0(CESoPSN Basic) UP mpls 2.2.2.2:10 UP
Router#sh controllers t1 0/4/32
T1 0/4/32 is up
Applique type is NCS4200-48T1E1-CE
Cablelength is short 110
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Framing is ESF, Line Code is B8ZS, Clock Source is Line.
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Restrictions for CESoPSN on T1 Interface

Verifying CEM for CESoPSN on T1 Interface
Use the following commands to verify the pseudowire configuration for CESoPSN:
• show cem circuit—Displays information about the circuit state, administrative state, the CEM ID of the
circuit, and the interface on which it is configured. If cross connect is configured under the circuit, the
command output also includes information about the attachment circuit status.
• show mpls l2 vc—Displays information about the MPLS VC.
• show mpls l2 vc detail—Displays detailed information about the MPLS VC.
PE1#show mpls l2 vc 10
Local intf Local circuit Dest address VC ID Status
------------- -------------------------- --------------- ---------- ----------
CE0/4/32 CESoPSN Basic 0 2.2.2.2 10 UP
PE1#sh mpls l2 vc 10 det
PE1#sh mpls l2 vc 10 detail
Local interface: CE0/4/32 up, line protocol up, CESoPSN Basic 0 up
Destination address: 2.2.2.2, VC ID: 10, VC status: up
Output interface: Te0/0/0, imposed label stack {650}
Preferred path: not configured
Default path: active
Next hop: 123.123.123.2
Create time: 00:21:25, last status change time: 00:21:25
Last label FSM state change time: 00:21:25
Signaling protocol: LDP, peer 2.2.2.2:0 up
Targeted Hello: 1.1.1.1(LDP Id) -> 2.2.2.2, LDP is UP
Graceful restart: configured and not enabled
Non stop routing: not configured and not enabled
Status TLV support (local/remote) : enabled/supported
LDP route watch : enabled
Label/status state machine : established, LruRru
Last local dataplane status rcvd: No fault
Last BFD dataplane status rcvd: Not sent
Last BFD peer monitor status rcvd: No fault
Last local AC circuit status rcvd: No fault
Last local AC circuit status sent: No fault
Last local PW i/f circ status rcvd: No fault
Last local LDP TLV status sent: No fault
Last remote LDP TLV status rcvd: No fault
Last remote LDP ADJ status rcvd: No fault
MPLS VC labels: local 577, remote 650
Group ID: local 238, remote 276
MTU: local 0, remote 0
Remote interface description:
Sequencing: receive disabled, send disabled
Control Word: On (configured: autosense)
SSO Descriptor: 2.2.2.2/10, local label: 577
Dataplane:
SSM segment/switch IDs: 6893171/4140658 (used), PWID: 674
VC statistics:
transit packet totals: receive 0, send 0
transit byte totals: receive 0, send 0
transit packet drops: receive 0, seq error 0, send 0
Router#show cem circuit int cem 0/4/32
CEM0/4/32, ID: 0, Line: UP, Admin: UP, Ckt: ACTIVE
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Verifying CEM for CESoPSN on T1 Interface

Mode :T1, CEM Mode: T1-CESoP
Controller state: up, T1/E1 state: up
Idle Pattern: 0xFF, Idle CAS: 0x8
Dejitter: 5 (In use: 0)
Payload Size: 80
Framing: Framed (DS0 channels: 1-10)
CEM Defects Set
None
Signalling: No CAS
RTP: No RTP
Ingress Pkts: 203997 Dropped: 0
Egress Pkts: 203999 Dropped: 0
CEM Counter Details
Input Errors: 0 Output Errors: 0
Pkts Missing: 0 Pkts Reordered: 0
Misorder Drops: 0 JitterBuf Underrun: 0
Error Sec: 0 Severly Errored Sec: 0
Unavailable Sec: 0 Failure Counts: 0
Pkts Malformed: 0 JitterBuf Overrun: 0
Generated Lbits: 0 Received Lbits: 0
Generated Rbits: 0 Received Rbits: 0
Generated Mbits: 0 Received Mbits: 0
Troubleshooting T1/E1 Controllers
You can use the following methods to troubleshoot the T1/E1 controllers:
Running Bit Error Rate Testing for SAToP
Bit error rate testing (BERT) is supported on T1/E1 interfaces. You can run BERTs on 16 controllers out of
48 T1/E1 controllers at a time.
The interface module contains onboard BERT circuitry. With this, the interface module software can send
and detect a programmable pattern that is compliant with CCITT/ITU O.151, O.152, O.153 pseudo-random
and repetitive test patterns. BERT allows you to test cables and signal problems in the field.
When running a BERT test, your system expects to receive the same pattern that it is transmitting. To help
ensure this, two common options are available:
• Use a loopback somewhere in the link or network
• Configure remote testing equipment to transmit the same BERT test pattern at the same time
The following keywords list different BERT keywords and their descriptions.
Table 1: BERT Pattern Descriptions
DescriptionKeyword
Repeating pattern of ones (...111...).1s
Pseudo-random test pattern that is 2,048 bits in length.2^11
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Troubleshooting T1/E1 Controllers

DescriptionKeyword
Pseudo-random O.151 test pattern that is 32,768 bits
in length.
2^15
Pseudo-random O.153 test pattern that is 1,048,575
bits in length.
2^20-O153
Pseudo-random QRSS O.151 test pattern that is
1,048,575 bits in length.
2^20-QRSS
Pseudo-random 0.151 test pattern that is 8,388,607
bits in length.
2^23
The total number of error bits received, and the total number of bits received are available for analysis. You
can select the testing period from 1 minute to 24 hours, and you can also retrieve the error statistics anytime
during the BERT test.
BERT is supported in two directions:
• Line - supports BERT in TDM direction
• System - supports BERT in PSN direction
Before starting system side BERT, you must configure CEM. When the BERT is configured towards system
direction, it internally loopbacks the TDM side.
Note
Configuring BERT for SAToP
Before You Begin
Before you run BERT test, you must configure card type and controller.
To run a BERT on T1/E1 interface, perform the following tasks in global configuration mode.
enable
configure terminal
controller t1/e1 0/1/1
bert pattern 2^11 interval 5direction line/system
exit
To terminate a BERT test during the specified test period, use the no bert command.
Note
Verifying BERT Configuration for SAToP
Use the following command to verify the BERT configuration for T1/E1 interfaces:
Router# show controllers t1/e1 0/1/1
T1/E1 0/1/1 is up.
48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Configuring BERT for SAToP

Applique type is NCS4200-48T1E1-CE
Cablelength is short 110
DSX1 BERT pattern : 2^11
DSX1 BERT direction : Line
DSX1 BERT sync : no sync
DSX1 BERT sync count : 0
DSX1 BERT interval : 5
DSX1 BERT time remain : 2
DSX1 BERT total errs : 0
DSX1 BERT total k bits: 0
DSX1 BERT errors (last): 0
DSX1 BERT k bits (last): 0
Last clearing of BERT counters never
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Framing is unframed, Line Code is B8ZS, Clock Source is Internal.
Data in current interval (320 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
Total Data (last 3 15 minute intervals):
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
You can view the results of a BERT test at the following times:
• After you terminate the test using the no bert command
• After the test runs completely
• Anytime during the test (in real time)
Bit Error Rate Testing for CESoPSN
Bit-Error Rate Testing (BERT) is used for analyzing quality and problem resolution of digital transmission
equipment. BERT tests the quality of an interface by directly comparing a pseudorandom or repetitive test
pattern with an identical locally generated test pattern. BERT is supported at the TDM side and pseudowire
side. BERT can be used either at NxDS0 or DS1 but not together.
BERT is supported on following controllers:
• T1NxDS0, DS1
• T3NxDS0, DS1 (channelised), clear channel DS3.
• OCXNxDS0, DS1 (channelised),DS3(channelised), clear channel DS3,STS1,STS-nc,VT-1.5,VT1.5 T1
Restrictions for BERT in CESoPSN
• The Cisco ASR 900 Series Router supports only the following BERT patterns: 2^11, 2^15, 2^20-O153,
and 2^20-QRSS.
• For the line side BERT to be configured at timeslot level, the first CEM should be configured and it
should be present at the same timeslot level where the BERT is configured.
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Bit Error Rate Testing for CESoPSN

• The system side BERT is not supported on partial timeslots. For the system side BERT, use full timeslots.
Configuring BERT for CESoPSN
Before You Begin
Before you run BERT test, you must configure card type and controller.
To run a BERT on T1/E1 interface for CESoPSN, perform the following tasks in global configuration mode.
enable
configure terminal
controller t1/e1 0/1/1
bert pattern 2^11 interval 5direction line/system timeslots value speed
exit
To terminate a BERT test during the specified test period, use the no bert command.
Note
Verifying BERT Configuration for CESoPSN
Use the following command to verify the BERT configuration for CESoPSN on T1 interfaces:
Router# show controllers t1 0/4/32 brief
T1 0/4/32 is up
Applique type is NCS4200-48T1E1-CE
Cablelength is short 110
DS0 Bert enabled on the following timeslots : 1-2
Speed : 64 kpbs
DSX1 BERT test result: (running)
DSX1 BERT pattern : 2^15
DSX1 BERT direction : Line
DSX1 BERT sync : sync
DSX1 BERT sync count : 1
DSX1 BERT interval : 1
DSX1 BERT time remain : 00:00:55
DSX1 BERT total errs : 0
DSX1 BERT total k bits: 512
DSX1 BERT errors (last): 0
DSX1 BERT k bits (last): 512
Last clearing of BERT counters never
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Framing is ESF, Line Code is B8ZS, Clock Source is Recovered Clock 32.
BER thresholds: SF = 10e-3 SD = 10e-6
Data in current interval (710 seconds elapsed):
39 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 1 Fr Loss Secs, 1 Line Err Secs, 0 Degraded Mins
1 Errored Secs, 0 Bursty Err Secs, 1 Severely Err Secs, 0 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 1 SEF/AIS Secs
Data in Interval 1:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Configuring BERT for CESoPSN

Data in Interval 2:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
Data in Interval 3:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
Data in Interval 4:
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
You can view the results of a BERT test at the following times:
• After you terminate the test using the no bert command
• After the test runs completely
• Anytime during the test (in real time)
Loopback on T1/E1 Interfaces
Loopback Description
You can use the following loopback on the T1/E1 interfaces.
DescriptionLoopback
Loops the outgoing transmit signal back to the receive
signal. This is done using the diagnostic loopback
feature in the interface module’s framer. The interface
transmits AIS in this mode. Set the clock source
command to internal for this loopback mode.
loopback diag
Loops the incoming receive signal back out to the
transmitter. You can specify whether to use the line
or payload.
Loopback local is supported on E1 interface.
loopback local
The incoming signal is looped back in the interface
using the framer’s line loopback mode. The framer
does not reclock or reframe the incoming data. All
incoming data is received by the interface driver.
loopback local line
Loops the incoming signal back in the interface using
the payload loopback mode of the framer. The framer
reclocks and reframes the incoming data before
sending it back out to the network.
Loopback Local Payload support is
available only when framing is ESF.
Note
loopback local payload
48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Loopback on T1/E1 Interfaces

DescriptionLoopback
Loops the incoming signal back in the interface
module using the line loopback mode of the framer.
The framer does not reclock or reframe the incoming
data. All incoming data is received by the interface
module driver.
Loopback network line is supported on E1 interface.
loopback network line
Configuring Loopback
Before You Begin
Before you configure loopback, you must configure the controller and the CEM.
To set a loopback local on the T1 interface, perform the following tasks in global configuration mode:
enable
configure terminal
controller t1 0/0/1
loopback local line
exit
To set a loopback diag on the T1 interface, perform the following tasks in global configuration mode:
enable
configure terminal
controller t1 0/0/1
loopbackdiag
exit
To set a loopback local on the E1 interface, perform the following tasks in global configuration mode:
enable
configure terminal
controller e1 0/0/1
loopback local
exit
To set a loopback network on the E1 interface, perform the following tasks in global configuration mode:
enable
configure terminal
controller e1 0/0/1
loopback network line
exit
To remove a loopback, use the no loopback command.
Note
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Configuring Loopback

Associated Commands
The commands used to configure the Interfaces.
URLCommands
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-c1.html#wp2336574570
card type
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-c1.html#wp2440628600
cem-group
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-o1.html#wp3946673156
payload-size dejitter-buffer
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-c1.html#wp2169323859
class cem
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-c2.html#wp1472647421
controller t1/e1
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-t2.html#wp8578094790
xconnect
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-l1.html#wp2312535965
linecode
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-f1.html#wp2853515177
framing
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-c2.html#wp6081785140
clock source
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-c1.html#wp2492964151
cable length
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-a1.html#wp3620978929
bert pattern
48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Associated Commands

URLCommands
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-c1.html#wp7026926390
channelized
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-l1.html#wp1033903426
loopback
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-s3.html#wp2149471094
show controller t1
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/
interface/command/ir-cr-book/
ir-s2.html#wp1632676058
show controller e1
Additional References for Configuring 48-Port T1/E1 CEM
Interface Module
Related Documents
Document TitleRelated Topic
Cisco IOS Master Commands List, All Releases
Cisco IOS commands
Standards and RFCs
TitleStandard/RFC
There are no standards and RFCs for this feature.
—
MIBs
MIBs LinkMIB
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco
MIB Locator found at the following URL:
http://www.cisco.com/go/mibs
—
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Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Additional References for Configuring 48-Port T1/E1 CEM Interface Module