Cisco ASR 9000 Series User manual

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Configuring Clear Channel T3/E3 and
Channelized T3 and T1/E1 Controllers on the
Cisco ASR 9000 Series Router
This module describes the configuration of clear channel T3/E3 controllers and channelized T3 and
T1/E1 controllers on the Cisco ASR 9000 Series Aggregation Services Routers.
You must configure the T3/E3 controller before you can configure an associated serial interface.
Feature History for Configuring T3/E3 Controller Interfaces
Release Modification
Release 3.9.0 This feature was introduced on the Cisco ASR 9000 Series Router for the
Cisco 2-Port Channelized OC-12c/DS0 SPA.
Release 4.0.0 Support for the following features was added on the Cisco 2-Port
Channelized OC-12c/DS0 SPA:
•NxDS0 channelization
•Link Noise Monitoring
Support for clear channel T3 controllers on the 1-Port Channelized
OC-48/STM-16 SPA was introduced.
Release 4.0.1 Support for the following SPAs was added:
•Cisco 1-Port Channelized OC-3/STM-1 SPA
•Cisco 2-Port and 4-Port Clear Channel T3/E3 SPA
Release 4.1.0 •Support for the following SPAs was added:
– Cisco 4-Port Channelized T3/DS0 SPA
– Cisco 8-Port Channelized T1/E1 SPA
•Support for a Link Noise Monitoring enhancement was added on the
Cisco 2-Port Channelized OC-12c/DS0 SPA to set thresholds for noise
errors on T1/E1 links that are used to signal the Noise Attribute to PPP
for removal of an MLPPP bundle link.

Configuring Clear Channel T3/E3 and Channelized T3 and T1/E1 Controllers on the Cisco ASR 9000 Series Router
Contents
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Contents
•Prerequisites for Configuring T3/E3 Controllers, page 446
•Information About T3/E3 Controllers and Serial Interfaces, page 446
•How to Configure Clear Channel T3/E3 Controllers and Channelized T1/E1 Controllers, page 455
•Configuration Examples, page 484
•Additional References, page 488
Prerequisites for Configuring T3/E3 Controllers
You must be in a user group associated with a task group that includes the proper task IDs. The command
reference guides include the task IDs required for each command. If you suspect user group assignment
is preventing you from using a command, contact your AAA administrator for assistance.
Before configuring T3/E3 controllers, be sure that you have one of the following supported SPAs
installed in the router:
•Cisco 2-Port and 4-Port Clear Channel T3/E3 SPA
•Cisco 4-Port Channelized T3/DS0 SPA
Note The 4-Port Channelized T3/DS0 SPA can run in clear channel mode, or it can be channelized
into 28 T1 or 21 E1 controllers.
•Cisco 1-Port Channelized OC-3/STM-1 SPA
•Cisco 2-Port Channelized OC-12c/DS0 SPA
•Cisco 1-Port Channelized OC-48/STM-16 SPA
•Cisco 8-Port Channelized T1/E1 SPA
•Before you can configure a clear channel T3 controller on the channelized SONET SPAs, you must
configure the SPA for an STS stream channelized for T3. For more information, see the
“Configuring Channelized SONET/SDH on the Cisco ASR 9000 Series Router” module.
Information About T3/E3 Controllers and Serial Interfaces
The 2-Port and 4-Port Clear Channel T3/E3 SPAs support clear channel services over serial lines only.
The 4-Port Channelized T3/DS0 SPA supports clear channel services and channelized serial lines. If a
controller is not channelized, then it is a clear channel controller, and the full bandwidth of its associated
serial line is dedicated to a single channel that carries serial services.
When a T3 controller is channelized, it is logically divided into smaller bandwidth T1 or E1 controllers,
depending on which mode of channelization you select. The sum of the bandwidth of the serial interfaces
on the T1 or E1 controllers cannot exceed the bandwidth of the T3 controller that contains those
channelized T1 or E1 controllers.
When you channelize a T3 controller, each individual T1 or E1 controller is automatically further
channelized into DS0 time slots. A single T1 controller carries 24 DS0 time slots, and a single E1
controller carries 31 DS0 time slots. Users can divide these DS0 time slots up into individual channel
groups. Each channel group can support a single serial interface.

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When a controller is channelized, and channel groups have been created, services are provisioned on the
associated serial interfaces.
The channelization feature in this release allows the following types of channelization:
•A single T3 controller into 28 T1 controllers, for a total controller size of 44210 kbps.
•A single T3 controller into 21 E1 controllers, for a total controller size of 43008 kbps.
•A single T1 controller supports up to 1.536 MB.
•A single E1 controller supports up to 2.048 MB.
Note A single shared port adapter (SPA) can support up to 448 channel groups.
This section includes the following additional topics:
•Supported Features, page 447
•Configuration Overview, page 452
•Default Configuration Values for T3 and E3 Controllers, page 452
•Default Configuration Values for T1 and E1 Controllers, page 453
•Link Noise Monitoring on T1 or E1 Links, page 454
Supported Features
Table 1 shows a summary of some of the supported features by SPA type.
Table 1 Supported Features on Channelized T3/E3, T1/E1, and Clear Channel SPAs
1-Port
Channelized
OC-3/STM-1
SPA
2-Port
Channelized
OC-12c/DS0
SPA
1-Port Channelized
OC-48/STM-16 SPA
4-Port
Channelized
T3/DS0 SPA
8-Port
Channelized
T1/E1 SPA
2-Port and
4-Port Clear
Channel T3/E3
SPA
Bit Error Ratio
Test (BERT)
T3, T1, E3,
E1, and DS0
channels
Maximum of
12 sessions1
Maximum 1
session for T1
T3 channels T3 and E3
Maximum of 2
simultaneous BERT
tests are possible per
STS-12.
T3, T1, E1
and DS0
channels
T1, E1, and
DS0 channels
T3 and E3
1 session per
port
Channelization
and
Clear Channel
Modes
Channelized
SONET/SDH
Channelized
T1/E1 to DS0s
Clear channel
SONET
Clear channel
T3 and E3 in
SDH mode for
serial
interfaces
Channelized
SONET/SDH
Channelized
T3/E3
Channelized
T1/E1 to DS0s
Clear channel
SONET
Channelized
SONET/SDH
Channelized T3/E3
Clear channel
SONET
Channelized
T3
Channelized
T1/E1
T3 clear
channel
Channelized
T1/E1 to
DS0s.
Clear channel
T1 and E1
Clear channel
T3 or E3 only

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DSU Modes Adtran
Digital-link
Cisco
Kentrox
Larscom
Ve r i l i n k
For E3
Cisco
(Default)
Digital Link
Kentrox
Adtran
Digital-link
Cisco Kentrox
Larscom
Verilink
Adtran
Digital-link
Cisco
Kentrox
Larscom
Verilink
Note Subrate for
E3 is not
supported.
Adtran
Digital-link
Cisco
Kentrox
Larscom
Ve r i l i n k
Adtran
Digital-link
Cisco
Kentrox
Larscom
Ve r i l i n k
Adtran
Digital-link
Cisco
Kentrox
Larscom
Verilink
Encapsulations Frame Relay
HDLC
PPP
HDLC
PPP
Frame Relay
HDLC
PPP
Frame Relay
HDLC
PPP
Frame Relay
HDLC
PPP
Frame Relay
HDLC
PPP
Equal Cost
Multipath
(ECMP)
Yes ECMP support
for egress paths
over T3 or T1
speed channels
with either PPP
or HDLC
encapsulation
ECMP support
for paths on
multiple
controllers,
SPAs, and SIPs
Yes Yes Ye s Yes
Facility Data
Link (FDL)
Yes Yes Yes Yes Ye s No
Far End Alarm
Control (FEAC)
For T3 C-bit
framing
For T3 C-bit
framing
For T3 C-bit
framing
For T3 C-bit
framing
For T3 C-bit
framing
Inter-Chassis
Stateful
Switchover
(ICSSO)2
For PPP on
T3, T1, and E1
channels only
(not DS0)
For MLPPP on
T1 and E1
sessions
For PPP on T3
channels
For T1 when T3
channels are
configured on
the same
system, SIP,
SPA or port
No T3, T1, and
E1 channels
only (not
DS0)
T1 and E1
channels only
(not DS0)
No
Table 1 Supported Features on Channelized T3/E3, T1/E1, and Clear Channel SPAs (continued)
1-Port
Channelized
OC-3/STM-1
SPA
2-Port
Channelized
OC-12c/DS0
SPA
1-Port Channelized
OC-48/STM-16 SPA
4-Port
Channelized
T3/DS0 SPA
8-Port
Channelized
T1/E1 SPA
2-Port and
4-Port Clear
Channel T3/E3
SPA

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IP Fast Reroute
(IP-FRR)
No For PPP only No T3, T1, and
E1 channels
T1 and E1
channels
No
Link Noise
Monitoring
No Yes No No No No
Loopback3
Yes Yes Yes Yes —Not
DS0
Yes—Not DS0 Yes
Maintenance
Data Link (MDL)
Message
Support
Yes Yes Yes Yes N /A Yes
Circuit
Emulation
Service Over
Packet
Switched
Network
Support
Yes Yes No No No No
Mixed Channel
Support
No—T3 and
E3 cannot be
mixed.
T1 and E1
cannot coexist
on single
STS-1.
Yes —T3 and
T1 channels
supported on
the same SIP,
SPA, or port
Yes Yes No—All
channels must
be either in T1
or E1 mode.
No—All ports
must be either
T3 or E3.
Scalability 1000 channels
per SPA
48 T3 channels
per SIP
24 T3 channels
per SPA
12 T3 channels
per interface
48 T3/E3 channels 1000 channels
per SPA
8 T1 or E1
ports
Up to 256
full-duplex
HDLC
channels
Nx64K or
Nx56K
channel
speeds, where
Nis less than
or equal to 24
for T1, and
less than or
equal to 32 for
E1
2 or 4 T3 or E3
ports
1. 6 simultaneous BERT sessions among first three physical ports and 6 simultaneous BERT sessions on 4th port.
2. All interfaces configured on a SONET/SDH controller for the 1-Port Channelized OC-3/STM-1 SPA should be IC-SSO protected or none of them should
be IC-SSO protected.
Table 1 Supported Features on Channelized T3/E3, T1/E1, and Clear Channel SPAs (continued)
1-Port
Channelized
OC-3/STM-1
SPA
2-Port
Channelized
OC-12c/DS0
SPA
1-Port Channelized
OC-48/STM-16 SPA
4-Port
Channelized
T3/DS0 SPA
8-Port
Channelized
T1/E1 SPA
2-Port and
4-Port Clear
Channel T3/E3
SPA

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Loopback Support
Cisco 1-Port Channelized OC-3/STM-1 SPA
This section describes the types of loopback supported on the 1-Port Channelized OC-3/STM-1 SPA:
•For SONET controller:
– Local loopback
– Network line loopback
•For T3:
– Local loopback
– Network loopback
– Remote loopback line (Use FEAC in C-Bit mode for T3)
– Remote loopback payload (Use FEAC in C-Bit mode for T3)
•For E3:
– Local loopback
– Network loopback
•For T1:
– Local loopback
– Network line loopback
– Remote line FDL ANSI loopback (also known as Remote CSU loopback - ESF mode)
– Remote line FDL Bellcore loopback (also known as Remote SmartJack loopback - ESF mode)
– Remote line inband loopback (SF inband loopback)
– Remote payload FDL ANSI loopback (ESF remote payload loopback)
•For E1:
– Local loopback
– Network line loopback
Cisco 2-Port Channelized OC-12c/DS0 SPA
This section describes the types of loopback supported on the 2-Port Channelized OC-12c/DS0 SPA:
•For T3
– Local loopback
– Network line loopback
•For ports
– Local line loopback
– Network line loopback
3. For detailed information about loopback support, see the “Loopback Support” section on page 450.

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Cisco 1-Port Channelized OC-48/STM-16 SPA
This section describes the types of loopback supported on the 1-Port Channelized OC-48/STM-16 SPA:
•For SONET:
– Local line loopback
– Network line loopback
•For T3:
– Local loopback
– Network line loopback
– Network payload loopback
•For E3:
– Local loopback
– Network loopback
Cisco 4-Port Channelized T3/DS0 SPA
This section describes the types of loopback supported on the 4-Port Channelized T3/DS0 SPA:
•For T3:
– Local loopback
– Network loopback
– Remote loopback line
•For T1:
– Local loopback
– Network line loopback
– Remote line FDL ANSI loopback (also known as Remote CSU loopback - ESF mode)
– Remote line FDL Bellcore loopback (also known as Remote SmartJack loopback - ESF mode)
•For E1:
– Local loopback
– Network line loopback
Cisco 8-Port Channelized T1/E1 SPA
This section describes the types of loopback supported on the 8-Port Channelized T1/E1 SPA:
•For T1:
– Local loopback
– Networkl line loopback
– Remote line FDL ANSI loopback (also known as Remote CSU loopback - ESF mode)
– Remote line FDL Bellcore loopback (also known as Remote SmartJack loopback - ESF mode)
•For E1:
– Local loopback

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Cisco 2-Port and 4-Port Clear Channel T3/E3 SPA
This section describes the types of loopback supported on the 2-Port and 4-Port Clear Channel T3/E3
SPA:
•Local loopback
•Network payload loopback (Configure the local framer to send all data received from the remote side
back to the remote side.)
•Network line loopback (Configure the local LIU to send all data received from the remote side back
to the remote side.)
•Remote line loopback (Use FEAC to request the remote interface to loop back to SPA—T3 only)
Configuration Overview
Configuring a channelized T3 controller and its associated serial interfaces is a 4-step process:
Step 1 Configure the T3 controller, and set the mode for that controller to T1 or E1.
Step 2 Configure the T1 or E1 controller.
Step 3 Create channel groups and assign DS0 time slots to these channel groups as desired.
Step 4 Configure the serial interfaces that are associated with the individual channel groups, as described in the
Configuring Serial Interfaces on the Cisco ASR 9000 Series Router module later in this document.
Default Configuration Values for T3 and E3 Controllers
Table 2 describes the default configuration parameters that are present on the T3 and E3 controllers.
Note • Auto-detect framing is not supported on the 2-Port Channelized OC-12c/DS0 SPA.
•E3 is not supported on the 4-Port Channelized T3/DS0 SPA.
Table 2 T3 and E3 Controller Default Configuration Values
Parameter Default Value Configuration File Entry
Frame type for the data line For T3: C-bit framing
For E3: G.751
framing {auto-detect | c-bit
| m23}
Clocking for individual T3/E3 links internal clock source {internal |
line}
Cable length 224 feet cablelength feet

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Note When configuring clocking on a serial link, you must configure one end to be internal, and the other
end to be line. If you configure internal clocking on both ends of a connection, framing slips occur. If
you configure line clocking on both ends of a connection, the line does not come up.
Default Configuration Values for T1 and E1 Controllers
Table 3 describes the default configuration parameters that are present on the T1 and E1 controllers.
Maintenance data link (MDL) messages
(T3 only)
disable mdl transmit {idle-signal |
path | test-signal} {disable |
enable}
National reserved bits for an E3 port
(E3 only)
enable, and the bit pattern
value is 1.
national bits {disable |
enable}
Table 2 T3 and E3 Controller Default Configuration Values
Parameter Default Value Configuration File Entry
Table 3 T1 and E1 Controller Default Configuration Values
Parameter Default Value Configuration File Entry
Frame type for the data line For T1: extended
superframe (esf)For E1:
framing with CRC-4 error
monitoring capabilities
(crc4).
For T1: framing {sf |
esf}For E1: framing {crc4 |
no-crc4 | unframed
Detection and generation of T1 yellow
alarms.
(T1 only)
Yellow alarms are
detected and generated on
the T1 channel.
yellow {detection |
generation} {disable |
enable}
Clocking for individual T1 and E1 links internal clock source {internal |
line}
Cable length
(T1 only)
For cablelength long
command: db-gain-value:
gain26; db-loss-value:
0db.
For cablelength short
command: 533 feet.
To set a cable length of
longer than 655 feet:
cablelength long
db-gain-value db-loss-value
To set a cable length of 655
feet or shorter: cablelength
short length
Transmission of ANSI T1.403 or AT&T
TR54016 once-per-second performance
reports through Facility Data Link (FDL)
for a T1 channel
(T1 only)
disable fdl {ansi | att} {enable |
disable}
National reserved bits for an E1 port
(E1 only)
0 (which corresponds to
0x1f in hexadecimal
format)
national bits bits

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Note When configuring clocking on a serial link, you must configure one end to be internal, and the other
end to be line. If you configure internal clocking on both ends of a connection, framing slips occur. If
you configure line clocking on both ends of a connection, the line does not come up.
Link Noise Monitoring on T1 or E1 Links
Link Noise Monitoring (LNM) provides the ability to monitor Path Code Violation (PCV) errors on T1
and E1 links on the 2-Port Channelized OC-12c/DS0 SPA on the Cisco ASR 9000 Series Router, and to
signal events and alarms on these links when noise continuously meets or exceeds configured thresholds
(the set threshold values) for those errors. Events are also signaled when noise falls below configured
improved thresholds (the clear threshold values).
Beginning in Cisco IOS XR Release 4.1, the LNM feature supports the lnm remove command to signal
the Noise Attribute to PPP to remove an MLPPP bundle member link when specified thresholds are
crossed.
Note An LCV is an occurrence of either a Bi-Polar Violation (BPV) or Excessive Zeroes (EXZ) error, and a
PCV is an occurrence of a CRC error in a timeslot. However, the LNM feature currently only monitors
PCV errors. The LCV values are only used to calculate an expected PCV if the PCV values are not
specified. If the PCV values are specified, then the LCV values are ignored.
LNM Events
There are two basic types of monitoring events produced by LNM:
•Crossed events—A crossed event signals when PCV threshold values continuously meet or exceed
the specified set values for major and minor warnings for a specified period of time (duration).
When a crossed event occurs, the major or minor monitoring type for the controller is reported as
the alarm state. When the crossed event is no longer present, the monitoring type returns to the
stable state.
The following are examples of crossed events:
RP/0/RSP0/CPU0:Router#0/1/CPU0:May 13 9:54:10.980 : g_spa_1[181]:
%L2-T1E1_LNM-3-MINWARNNOISE :
Interface T10/1/1/0/1/1/1, noise crossed minor warning threshold
RP/0/RSP0/CPU0:Router#0/1/CPU0:May 13 9:54:11.980 : g_spa_1[181]:
%L2-T1E1_LNM-3-MAJWARNNOISE :
Interface T10/1/1/0/1/1/1, noise crossed major warning threshold
•Cleared events—A cleared event signals when threshold values that were crossed have fallen below
the specified clear values for major and minor warnings.
The following are examples of cleared events:
RP/0/RSP0/CPU0:Router#LC/0/1/CPU0:May 13 10:27:25.809 : g_spa_1[181]:
%L2-T1E1_LNM-3-MAJWARNNOISE :
Interface T10/1/1/0/1/1/1, noise cleared major warning threshold
RP/0/RSP0/CPU0:Router#LC/0/1/CPU0:May 13 10:28:14.810 : g_spa_1[181]:
%L2-T1E1_LNM-3-MINWARNNOISE :
Interface T10/1/1/0/1/1/1, noise cleared minor warning threshold

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LNM Logging
When you enable syslog messages for LNM events using the lnm syslog command, LNM messages will
appear in both the system log and in the log events buffer. You can display LNM events in the log events
buffer using the show logging events buffer bistate-alarms-set command, and also using the show
logging command, which are described in the Cisco ASR 9000 Series Aggregation Services Router
System Monitoring Command Reference.
LNM supports hierarchical level alarm reporting as defined in the Telcordia (Bellcore) GR-253 standard.
Hierarchical alarm reporting means that whenever a higher alarm is asserted, the lower alarm state is
suppressed. When the high alarm is cleared, the lower alarm will re-assert if the condition still exists.
For LNM, this means that if a major warning threshold is continuously met or exceeded resulting in a
crossed event and alarm state, then a minor warning alarm state is suppressed and returned to stable state.
The minor crossed event also is removed from the bistate log. When the major warning is cleared, the
minor warning alarm is asserted if the condition still exists.
Only a single crossed event for major warnings will appear in the bistate log for the controller. Therefore,
you will see only a single log message for a controller if noise exists above configured threshold values.
How to Configure Clear Channel T3/E3 Controllers and
Channelized T1/E1 Controllers
The T3/E3 controllers are configured in the physical layer control element of the Cisco IOS XR software
configuration space. This configuration is described in the following tasks:
•Configuring a Clear Channel E3 Controller, page 455
•Modifying the Default E3 Controller Configuration, page 457
•Configuring a Clear Channel T3 Controller, page 460
•Configuring a Channelized T3 Controller, page 461
•Modifying the Default T3 Controller Configuration, page 464
•Configuring a T1 Controller, page 466
•Configuring an E1 Controller, page 470
•Configuring BERT, page 474
•Configuring Link Noise Monitoring on a T1 or E1 Channel, page 481
Configuring a Clear Channel E3 Controller
When an E3 controller is in clear channel mode, it carries a single serial interface.
The E3 controllers are configured using the E3 configuration mode.
Restrictions
•If you configure an option that is not valid for your controller type, you receive an error when you
commit the configuration.
•A single SPA cannot support a mixture of T3 and E3 interfaces.

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•E3 is not supported on the 4-Port Channelized T3/DS0 SPA.
SUMMARY STEPS
1. configure
2. controller e3 interface-path-id
3. mode serial
4. no shutdown
5. end
or
commit
6. show controllers e3 interface-path-id
DETAILED STEPS
Command or Action Purpose
Step 1 configure
Example:
RP/0/RSP0/CPU0:router# configure
Enters global configuration mode.
Step 2 controller e3 interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# controller t3
0/1/0/0
Specifies the E3 controller name in the notation
rack/slot/module/port and enters E3 configuration mode.
Step 3 mode serial
Example:
RP/0/RSP0/CPU0:router(config-e3)# mode serial
Configures the mode of the port to be clear channel serial.
Note This step is required for the 2-Port and 4-Port
Channelized T3 SPA only. The 2-Port and 4-Port
Clear Channel T3/E3 SPA run in serial mode by
default.
Step 4 no shutdown
Example:
RP/0/RSP0/CPU0:router(config-e3)# no shutdown
Removes the shutdown configuration.
•The removal of the shutdown configuration removes
the forced administrative down on the controller,
enabling the controller to move to an up or a down state.

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What to Do Next
•Modify the default configuration that is running on the E3 controller you just configured, as
described in the “Modifying the Default E3 Controller Configuration” section later in this module.
•Configure a bit error rate test (BERT) on the controller to test its integrity, as described in the
“Configuring BERT” section later in this module.
•Configure the associated serial interface, as described in the Configuring Serial Interfaces on the
Cisco ASR 9000 Series Router module later in this document.
Modifying the Default E3 Controller Configuration
This task explains how to modify the default E3 controller configuration, which is described in the
“Default Configuration Values for T3 and E3 Controllers” section earlier in this module.
Prerequisites
You must configure a clear channel E3 controller, as described in the “Configuring a Clear Channel E3
Controller” section earlier in this module.
Step 5 end
or
commit
Example:
RP/0/RSP0/CPU0:router(config-e3)# end
or
RP/0/RSP0/CPU0:router(config-e3)# commit
Saves configuration changes.
•When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
– Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
– Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
– Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
•Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Step 6 show controllers e3 interface-path-id
Example:
RP/0/RSP0/CPU0:router# show controllers e3
0/1/0/0
(Optional) Displays information about the E3 controllers.
Command or Action Purpose

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Restrictions
•E3 is not supported on the 4-Port Channelized T3/DS0 SPA.
SUMMARY STEPS
1. configure
2. controller e3 interface-path-id
3. clock source {internal | line}
4. cablelength feet
5. framing {g751 | g832}
6. national bits {disable | enable}
7. no shutdown
8. end
or
commit
9. show controllers e3 interface-path-id
DETAILED STEPS
Command or Action Purpose
Step 1 configure
Example:
RP/0/RSP0/CPU0:router# configure
Enters global configuration mode.
Step 2 controller e3 interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# controller t3
0/1/0/0
Specifies the E3 controller name in the notation
rack/slot/module/port and enters E3 configuration mode.
Step 3 clock source {internal | line}
Example:
RP/0/RSP0/CPU0:router(config-e3)# clock source
internal
(Optional) Sets the clocking for individual E3 links.
Note The default clock source is internal.
Note When configuring clocking on a serial link, you
must configure one end to be internal, and the other
end to be line. If you configure internal clocking on
both ends of a connection, framing slips occur. If
you configure line clocking on both ends of a
connection, the line does not come up.
Step 4 cablelength feet
Example:
RP/0/RSP0/CPU0:router(config-e3)# cablelength
250
(Optional) Specifies the distance of the cable from the
router to the network equipment.
Note The default cable length is 224 feet.

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What to Do Next
•Modify the default configuration that is running on the T3 controller you just configured, as
described in the “Modifying the Default T3 Controller Configuration” section later in this module.
•Configure BERT on the controller to test its integrity, as described in the “Configuring BERT”
section later in this module.
•Configure the associated serial interface, as described in the Configuring Serial Interfaces on the
Cisco ASR 9000 Series Router module later in this document.
Step 5 framing {g751 | g832}
Example:
RP/0/RSP0/CPU0:router(config-e3)# framing g832
(Optional) Selects the frame type for the E3 port. Possible
E3 frame types are G.751 and G.832.
Note The default framing for E3 is G.751.
Step 6 national bits {disable | enable}
Example:
RP/0/RSP0/CPU0:router(config-e3)# national bits
enable
(Optional) Enables or disables the 0x1F national reserved
bit pattern on the E3 port.
Note The E3 national bit is enabled by default, and the bit
pattern value is 1.
Step 7 no shutdown
Example:
RP/0/RSP0/CPU0:router(config-e3)# no shutdown
Removes the shutdown configuration.
•The removal of the shutdown configuration removes
the forced administrative down on the controller,
enabling the controller to move to an up or a down state.
Step 8 end
or
commit
Example:
RP/0/RSP0/CPU0:router(config-e3)# end
or
RP/0/RSP0/CPU0:router(config-e3)# commit
Saves configuration changes.
•When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
– Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
– Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
– Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
•Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Step 9 show controllers e3 interface-path-id
Example:
RP/0/RSP0/CPU0:router# show controllers e3
0/1/0/0
(Optional) Displays information about the E3 controllers.
Command or Action Purpose

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Configuring a Clear Channel T3 Controller
When a T3 controller is in clear channel mode, it carries a single serial interface.
The T3 controllers are configured in the T3 configuration mode.
Prerequisites
Before you can configure a clear channel T3 controller on a channelized SPA, you must configure the
SPA for an STS stream channelized for T3. For more information, see the “Configuring Channelized
SONET/SDH on the Cisco ASR 9000 Series Router” module.
Restrictions
•If you configure an option that is not valid for your controller type, you receive an error when you
commit the configuration.
•A single SPA cannot support a mixture of T3 and E3 interfaces.
SUMMARY STEPS
1. configure
2. controller t3 interface-path-id
3. mode serial
4. no shutdown
5. end
or
commit
6. show controllers t3 interface-path-id
DETAILED STEPS
Command or Action Purpose
Step 1 configure
Example:
RP/0/RSP0/CPU0:router# configure
Enters global configuration mode.
Step 2 controller t3 interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# controller t3
0/1/0/0
Specifies the T3 controller name in the
rack/slot/module/port notation and enters T3 configuration
mode.
Step 3 mode serial
Example:
RP/0/RSP0/CPU0:router(config-t3)# mode serial
Note Configures the mode of the port to be clear channel
serial.

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What to Do Next
•Modify the default configuration that is running on the T3 controller you just configured, as
described in the “Modifying the Default T3 Controller Configuration” section later in this module.
•Configure BERT on the controller to test its integrity, as described in the “Configuring BERT”
section later in this module.
•Configure the associated serial interface, as described in the Configuring Serial Interfaces on the
Cisco ASR 9000 Series Router module.
Configuring a Channelized T3 Controller
The SPAs that support channelized T3 support channelization to T1, E1, and DS0. The steps in this
section describe how to channelize a single T3 controller into 28 T1 controllers or 21 E1 controllers.
Once you have created T1 or E1 controllers, you can further channelize those controllers into DS0 time
slots, as described in the following sections:
•Configuring a T1 Controller
Step 4 no shutdown
Example:
RP/0/RSP0/CPU0:router(config-t3)# no shutdown
Removes the shutdown configuration.
•The removal of the shutdown configuration removes
the forced administrative down on the controller,
enabling the controller to move to an up or a down state.
Step 5 end
or
commit
Example:
RP/0/RSP0/CPU0:router(config-t3)# end
or
RP/0/RSP0/CPU0:router(config-t3)# commit
Saves configuration changes.
•When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
– Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
– Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
– Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
•Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Step 6 show controllers t3 interface-path-id
Example:
RP/0/RSP0/CPU0:router# show controllers t3
0/1/0/0
(Optional) Displays information about the T3 controllers.
Command or Action Purpose

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•Configuring an E1 Controller
Each individual T1 controller supports a total of 24 DS0 time slots, and each individual E1 controller
supports a total of 31 DS0 time slots.
Prerequisites
Before you configure a channelized T3 controller, be sure that the following requirements are met:
•You have one of the following SPAs installed:
– 1-Port Channelized OC-3/STM-1 SPA
– 2-Port Channelized OC-12/DS0 SPA
– 4-Port Channelized T3/DS0 SPA
•For the channelized SONET SPAs, you have configured the SPA for an STS stream channelized for
T3. For more information, see the “Configuring Channelized SONET/SDH on the
Cisco ASR 9000 Series Router” module.
Note If you configure an option that is not valid for your controller type, you receive an error when you
commit the configuration.
SUMMARY STEPS
1. configure
2. controller t3 interface-path-id
3. mode [t1 | e1]
4. no shutdown
5. end
or
commit
6. show controllers t3 interface-path-id
DETAILED STEPS
Command or Action Purpose
Step 1 configure
Example:
RP/0/RSP0/CPU0:router# configure
Enters global configuration mode.
Step 2 controller T3 interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# controller t3
0/1/0/0
Specifies the T3 controller name in the notation
rack/slot/module/port and enters T3 configuration mode.

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What to Do Next
•Modify the default configuration that is running on the T3 controller you just configured, as
described in the “Modifying the Default T3 Controller Configuration” section on page 464.
•If you channelized your T3 controller into 28 T1 controllers, configure the T1 controllers and assign
DS0 time slots to them, as described in the “Configuring a T1 Controller” section on page 466.
•If you channelized your T3 controller into 21 E1 controllers, configure the E1 controllers and assign
DS0 time slots to them, as described in the “Configuring an E1 Controller” section on page 470.
Step 3 mode t1
Example:
RP/0/RSP0/CPU0:router(config-t3)# mode t1
Sets the mode of the channelized controllers to be T1, and
creates 28 T1 controllers.
Step 4 no shutdown
Example:
RP/0/RSP0/CPU0:router(config-t3)# no shutdown
Removes the shutdown configuration.
•The removal of the shutdown configuration removes
the forced administrative down on the controller,
enabling the controller to move to an up or a down state.
Step 5 end
or
commit
Example:
RP/0/RSP0/CPU0:router(config-t3)# end
or
RP/0/RSP0/CPU0:router(config-t3)# commit
Saves configuration changes.
•When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
– Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
– Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
– Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
•Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Step 6 show controllers t3 interface-path-id
Example:
RP/0/RSP0/CPU0:router# show controllers t3
0/1/0/0
(Optional) Displays information about the T3 controllers.
Command or Action Purpose

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Modifying the Default T3 Controller Configuration
This task explains how to modify the default T3 controller configuration, which is described in the
“Default Configuration Values for T3 and E3 Controllers” section on page 452.
Prerequisites
You must configure a clear channel or channelized T3 controller, as described in one of the following
sections:
•Configuring a Clear Channel T3 Controller
•Configuring a Channelized T3 Controller
SUMMARY STEPS
1. configure
2. controller t3 interface-path-id
3. clock source {internal | line}
4. cablelength feet
5. framing {auto-detect | c-bit | m23}
6. mdl transmit {idle-signal | path | test-signal} {disable | enable}
7. mdl string {eic | fi | fic | gen-number | lic | port-number | unit} string
8. no shutdown
9. end
or
commit
10. show controllers t3 interface-path-id
DETAILED STEPS
Command or Action Purpose
Step 1 configure
Example:
RP/0/RSP0/CPU0:router# configure
Enters global configuration mode.
Step 2 controller T3 interface-path-id
Example:
RP/0/RSP0/CPU0:router(config)# controller t3
0/1/0/0
Specifies the T3 controller name in the notation
rack/slot/module/port and enters T3 configuration mode.