Cisco ASR 900 Series User manual

1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM
Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco
ASR 900 Series)
First Published: 2017-04-04
Americas Headquarters
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
USA
http://www.cisco.com
Tel: [phone]
800 553-NETS (6387)
Fax: [phone]
Text Part Number:

©Cisco Systems, Inc. All rights reserved.

CONTENTS
CHAPTER 1 Configuring Support of 1 port OC-48/ 4 port OC-12/OC-3 + 12 port T1/E1 + 4 port T3/E3 CEM
Interface Module 1
Restrictions of Feature Support on 4 Port OC48/OC12/OC3 + 12 Port T1/E1 + 4 Port T3/E3 CEM
Interface Module 1
Port Licensing 2
Information About Port Licensing 2
Installing a License 3
Enabling a License 3
Verifying License Configuration 3
Disabling a License 4
Uninstalling a License 4
Enabling T1 Controller 4
Configuring the Controller 4
Enabling T3 Controller 5
Enabling SONET Controller 5
Associated Commands 5
Additional References 5
CHAPTER 2 Configuring CEM 7
Overview of Circuit Emulation 7
Structure-Agnostic TDM over Packet 7
Configuring CEM 8
Configuring CEM Classes 8
Configuring CEM Parameters 8
Configuring Payload Size (Optional) 9
Setting the Dejitter Buffer Size 9
Shutting Down a CEM Channel 9
Configuring DS1 CT3 SAToP Mode on OCx Ports 9
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
XE Fuji 16.7.x (Cisco ASR 900 Series)
iii

Configuring VT DS1 SAToP Mode 9
Configuring STS-Nc CEP 10
Configuring CEP 10
Configuring VT-15 CEP 10
Configuring DS3 SAToP 10
Configuring CEM APS 11
Configuring Unidirectional APS 11
Configuring Bi-directional ACR (SONET Framing) 11
Configuring CEM APS 12
Associated Commands 12
Additional References for Configuring CEM 13
CHAPTER 3 Configuring T1 Interfaces 15
Information About T1 Interfaces 15
Overview of T1 Interfaces 15
Configuring the Controller 15
Verifying Controller Configuration 16
Performance Monitoring 16
Configuring Structure-Agnostic TDM over Packet - T1 Interfaces 16
Verifying CEM Configuration for SAToP 17
Troubleshooting T1 Controllers 17
Running Bit Error Rate Testing 17
Configuring BERT 18
Verifying BERT Configuration for SAToP 18
Loopback on T1 Interfaces 19
Configuring Loopback 20
Associated Commands 20
CHAPTER 4 Configuring T3 Interfaces 23
Information About T3 Interfaces 23
Overview of T3 Interfaces 23
Benefits of T3 Interfaces 23
Enabling T3 Controller 24
Configuring the Controller of Clear Channel T3 Interfaces 24
Verifying Controller Configuration of Clear Channel T3 Interfaces 24
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco
IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
iv
Contents

Configuring the Controller of Channelized T3/T1 Interfaces 25
Verifying the Controller Configuration of Channelized T3/T1 Interfaces 25
Configuring SAToP - Clear Channel T3 Interfaces 26
Verifying CEM Configuration of Clear Channel T3 Interfaces for SAToP 26
Configuring SAToP - Channelized T3/T1 Interfaces 27
Verifying the CEM Configuration of Channelized T3/T1 Interfaces 27
Performance Monitoring 28
Troubleshooting T3 Controllers 31
Running Bit Error Rate Testing 31
Configuring BERT for Clear and Channelized T3 Interfaces 32
Verifying the BERT Configuration for T3 Interfaces 33
Loopback on T1/T3 Interfaces 33
Configuring Loopback for T3 Interfaces 34
Associated Commands 34
CHAPTER 5 Configuring Pseudowire 37
Information About Pseudowire 37
Overview of Pseudowire 37
Overview of Circuit Emulation 37
Structure-Agnostic TDM over Packet 38
How to Configure Pseudowire 38
Configuring CEM 38
Configuring CEM Group for SAToP for T1 Interfaces 38
Configuring CEM Classes 39
Configuring CEM Parameters 39
Configuring Payload Size 39
Configuring Payload Size for T3 Interfaces 39
Setting the Dejitter Buffer Size 40
Shutting Down a CEM Channel 40
Configuring CEM Parameter on CEM Interface 40
Verifying the Interface Configuration 40
Associated Commands 41
Additional References for Configuring Pseudowire 42
CHAPTER 6 Clock Recovery System for SAToP 45
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
XE Fuji 16.7.x (Cisco ASR 900 Series)
v
Contents

Finding Feature Information 45
Information About Clock Recovery 45
Adaptive Clock Recovery (ACR) 45
Differential Clock Recovery (DCR) 46
Benefits of Clock Recovery 46
Prerequisites for Clock Recovery 47
Restrictions for Clock Recovery 47
How to Configure ACR and DCR 47
Configuring Adaptive Clock Recovery of T1 Interfaces for SAToP 47
Configuring Adaptive Clock Recovery of T3 Interfaces for SAToP 48
Verifying Adaptive Clock Recovery Configuration of T3 Interfaces for SAToP 48
Configuring Differential Clock Recovery of T3 Interfaces for SAToP 49
Verifying the Differential Clock Recovery Configuration of Channelized T3/T1 Interfaces
for SAToP 49
Associated Commands 50
Additional References for Clock Recovery 51
CHAPTER 7 CEM over MPLS QoS 53
Finding Feature Information 53
Information About CEM over MPLS QOS 53
Classifying and Marking MPLS EXP Overview 53
Prerequisites for CEM over MPLS QoS 54
Restrictions for CEM over MPLS QoS 54
How to Classify and Mark MPLS EXP 54
Classifying MPLS Encapsulated Packets 54
Marking MPLS EXP on Imposed Labels 55
Classifying and Marking MPLS EXP 55
Configuration Examples 55
Example: Defining an MPLS EXP Class Map 55
Example: Defining a Policy Map and Applying the Policy Map to an Ingress Interface 56
Example: Defining a Policy Map and Applying the Policy Map to an Egress Interface 56
Example: Defining an MPLS EXP Imposition Policy Map 56
Example: Applying the MPLS EXP Imposition Policy Map to a Main Interface 57
Example: Applying the MPLS EXP Imposition Policy Map to an EVC 57
Example: Defining an MPLS EXP Label Switched Packets Policy Map 57
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco
IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
vi
Contents

Example: Applying the MPLS EXP Label Switched Packets Policy Map to a Main
Interface 58
Additional References for CEM over MPLS QoS 58
CHAPTER 8 Configuring SONET 61
Overview of SONET 62
Restrictions for SONET 62
SONET Switching 63
SONET Hierarchy 64
Section 64
Line 64
Path 64
STS-1 and STS-3 Frames 65
SONET Line and Section Configuration Parameters 66
BERT 67
Concatenated SONET Frames 68
SONET Path Level Configuration Parameters 68
Channelized SONET Frames 68
SONET T1 Configuration Parameters 68
SONET T3 Configuration Parameters 69
SONET VT Configuration Parameters 69
SONET Protection Switching 69
1+1 APS 70
Benefits of APS 70
APS 1+1 for SONET Layer 1 traffic 71
Scenario for Bidirectional APS 1+1 71
Scenario for Unidirectional APS 1+1 72
Alarms at SONET Layers 72
SONET Alarm Surveillance 73
Section Alarms 73
Line Alarms 73
Path Alarms 73
VT Alarms 74
T1 Alarms 74
T3 Alarms 74
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
XE Fuji 16.7.x (Cisco ASR 900 Series)
vii
Contents

Alarm Indicators 75
How to Configure SONET 75
Prerequisites for Configuring SONET 75
Configuring MediaType Controller 75
Configuring SONET Ports 75
Managing and Monitoring SONET Line 75
Configuring Line and Section Overhead 76
Configuring Line Loopback 76
Configuring AIS Shut 76
Configuring Shut 76
Configuring Alarm Reporting 77
Configuring Clock 77
Configuring STS-1 Modes 77
Configuring DS1/T1 CT3 mode of STS-1 78
Configuring STS-Nc - Contiguous Concatenation 78
Configuring APS for SAToP 78
Configuring Bi-directional ACR (SONET Framing) 79
Configuring Unidirectional APS 79
Verifying ACR Configurations 79
Configuring VT 1.5-T1 Loopback 81
Configuring VT 1.5-T1 BERT 82
Configuring Path Overhead 82
Configuring Path Threshold 82
Verification of SONET Configuration 82
Performance Monitoring Use Cases or Deployment Scenarios 85
ONS Pluggables 89
Configuring ONS Pluggables 89
Verifying the Supported Pluggables 89
Associated Commands 91
CHAPTER 9 Configuring SDH 95
Overview of SDH 95
Basic SDH Signal 96
SDH Hierarchy 96
SDH Frame Structure 96
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco
IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
viii
Contents

VC 97
CEM Overview 98
Services Provided by SDH Configuration 98
SDH Multiplexing 101
Modes of SDH 102
Configuring AUG Mapping 103
Configuring AU-3 or AU-4 Mapping 103
Configuring Mixed AU-3 and AU-4 Mapping 103
Verifying AUG Mapping Configuration 103
Configuring Modes under AU-4 Mapping 104
Configuring Mode VC-4 CEP 104
Verifying Mode VC-4 Configuration 104
Configuring Mode TUG-3 105
Configuring AU-4 —TUG-3 —VC-3 —DS3 105
Verifying DS3 Configuration 105
Configuring AU-4 —TUG-3 —VC-3 —E3 106
Verifying E3 Configuration 106
Configuring Mode VC-1x 106
Configuring AU-4 —TUG-3 —TUG-2 —VC-11 —T1 107
Configuring AU-4 —TUG-3 —TUG-2 —VC-12 107
Configuring AU-4 —TUG-3 —TUG-2 —VC-11 —VC 108
Configuring AU-4 —TUG-3 —TUG-2 —VC-12 —VC 108
Verifying Mode VC-1x Configuration 108
Configuring Mode VC-4 Nc 109
Verifying Mode VC-4 Nc Configuration 109
Configuring AU-3 —VC-3 —DS3 109
Configuring AU-3 —VC-3 —E3 110
Configuring Modes under AU-3 Mapping 110
Configuring Mode VC-1x 110
Configuring AU-3 —TUG-2 —VC-11 —VC 110
Configuring AU-3 —TUG-2 —VC-12 —VC 110
Configuring AU-3 —TUG-2 —VC-11 —T1 111
Configuring AU-3 —TUG-2 —VC-12 —E1 111
Verifying Mode VC-1x Configuration 111
Restrictions for SDH 112
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
XE Fuji 16.7.x (Cisco ASR 900 Series)
ix
Contents

Configuring Mediatype Controller 113
Configuring Rate on SDH Ports 113
SDH Line and Section Configuration Parameters 113
Overhead 113
Configuring Line and Section Overhead 114
Threshold 114
Configuring Line and Section Threshold 114
Loopback 114
Configuring Line Loopback 115
AIS-Shut 115
Configuring AIS Shut 115
Shutdown 115
Configuring Shut 115
Alarm Reporting 116
Configuring Alarm Reporting 116
Clock Source 117
Configuring Clock 117
Verifying SDH Line and Section Parameters Configuration 117
Configuring SDH Path Parameters 118
Path Overhead 118
Configuring C2 Flag 118
J1 Flag 119
Path Threshold 119
Configuring Path Threshold 119
Path Loopback 120
Configuring Path Loopback 120
Configuring Path BERT 120
Verifying Path Parameters Configuration 120
Configuring BERT in SDH for SAToP 121
Configuring BERT in Modes VC-4 and VC Nc 122
Verifying BERT Configuration in Modes VC-4 and VC Nc 122
Configuring E1 Bert 122
Configuring T1 Bert 122
Configuring BERT in Mode T3/E3 123
Verifying BERT Configuration in Mode T3/E3 123
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco
IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
x
Contents

Configuring BERT in Mode VC-1x 123
Verifying BERT Configuration in Mode VC-1x 123
SDH T1/E1 Configuration Parameters 124
Configuring T1/E1 Parameters 124
Verifying T1/E1 Parameters Configuration 124
SDH T3/E3 Configuration Parameters 125
Configuring SDH T3/E3 Parameters Configuration 125
Verifying SDH T3/E3 Parameters Configurations 125
SDH VC Configuration Parameters for SAToP 126
Configuring VC Parameters 126
Verifying VC Configuration Parameters Configurations 126
Configuring ACR 127
Verifying ACR Configuration 128
Configuring DCR 128
Verifying DCR Configuration 129
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
XE Fuji 16.7.x (Cisco ASR 900 Series)
xi
Contents

1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco
IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
xii
Contents

CHAPTER 1
Configuring Support of 1 port OC-48/ 4 port
OC-12/OC-3 + 12 port T1/E1 + 4 port T3/E3 CEM
Interface Module
The 1 port OC-48/ 4 port OC-12/OC-3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module has 12XDS1,
4XDS3, electrical interfaces, and 4XSFP ports that can provide multiple functions such as 1XOC-48/12/3
and 3XOC-12/3. The maximum speed supported on OCx ports is OC-48. The interface module supports a
maximum of 3G CEM traffic.
OCx Port License should be enabled for the configuration.Note
•Restrictions of Feature Support on 4 Port OC48/OC12/OC3 + 12 Port T1/E1 + 4 Port T3/E3 CEM
Interface Module, page 1
•Port Licensing, page 2
•Uninstalling a License, page 4
•Enabling T1 Controller, page 4
•Enabling T3 Controller, page 5
•Enabling SONET Controller, page 5
•Associated Commands, page 5
•Additional References , page 5
Restrictions of Feature Support on 4 Port OC48/OC12/OC3 + 12
Port T1/E1 + 4 Port T3/E3 CEM Interface Module
•CESoP is not supported.
•Mixed mode support, for example, DS1 and E1 or DS3 and E3 or SONET and SDH simultaneously on
different ports is not available.
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
XE Fuji 16.7.x (Cisco ASR 900 Series)
1

•E1/E3, Unidirectional Path Switching Ring (UPSR), and Data Communication Channel (DCC) are not
supported.
•Multiservice functionality: PPP, MLPPP, FR, and MLFR are not supported.
•EoS and EoPDH are not supported.
•The IM is only supported on Cisco RSP2 Module.
•The configure replace command is not supported on the T1/E1 interface modules.
•A combination of T1/T3/SONET with E1/E3/SDH modes are not supported.
Port Licensing
The Cisco Software License Activation feature is a set of processes and components to activate Cisco IOS-XE
software feature sets by obtaining and validating fee-based Cisco software licenses.You should enable the
license only for OCx ports. License is not required for the ports 0-15 (DSx ports).
You should associate a required license to a port. Many licenses can be configured for a port. Only one license
can be associated with a port as only one rate can be configured at a time. Other licenses are not required
unless rate is changed frequently.
No license is enabled on the port by default. Same port license (OC-3 or OC-12) can be used for Legacy OC-3
IM. A port can be enabled with any one of the following license types:
•OC-3
•OC-12
•OC-48
On each IM, OCx port can be configured on ports 16-19. For example, a maximum of four OC-3 ports can
be configured on ports 16-19. A maximum of four OC-12 ports can be configured on ports 16-19. A maximum
of one OC-48 port can be configured on ports 16-19.
Information About Port Licensing
Scenario of IM Removal
•All licenses enabled on the IM ports are removed.
•The free licenses can be associated with the same or different IM ports.
Scenario of IM Re-insertion
•When IM is inserted back in the same slot, the IM ports require the licenses based on the configurations.
•The available free licenses are used and old configurations are retained.
•When free licenses are not available, the controller port moves to "shut" state and the following error
message is displayed:
Controller port does not have license so putting it into shut state. Un-shut after
enabling license or remove controller port configuration
•To remove the "shut" state, perform any one of the following actions:
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco
IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
2
Configuring Support of 1 port OC-48/ 4 port OC-12/OC-3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module
Port Licensing

Remove all the configurations present at rate level and beyond.
•
•Enable the license on the port that has the same rate as that of the configured controller. For example,
enable OC3 license for any OC3 configuration to remove the "shut" state.
Thus, port configurations remain intact and controller port re-configuration is not required.
Installing a License
To install or upgrade a license by using the license install command, you must have already received the
license file from the Cisco Product License Registration portal at http://www.cisco.com/go/license (or you
already backed up the license by using the license save command).
To install the license:
enable
show license udi
Convert the PAK to a license by entering the PAK and the UDI into the Cisco Product License
Registration portal: http://www.cisco.com/go/license
license install stored-location-url
show license detail
end
Enabling a License
Use the platform enable controller Mediatype <slot/bay/port> <port rate> to enable a particular license
type on the controller port. Providing a particular license type is mandatory to enable the license on the IM.
This command is not applicable for DSx ports (0-15).Note
You should configure controller mediatype and controller SONET before enabling the license on the port.
License enabling is allowed when the license with the same rate is configured on the port. The configuration
fails if the license with a different rate is configured on the port.
Note
To enable port licensing:
enable
configure terminal
platform enable controller MediaType 0/4/16 oc3
controller MediaType 0/4/16
mode sonet
exit
controller sonet 0/4/16
rate oc3
exit
Verifying License Configuration
Use the show license detail command to verify the license configuration:
Router#show license detail
Index: 15 Feature: oc3 Version: 1.0
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
XE Fuji 16.7.x (Cisco ASR 900 Series)
3
Configuring Support of 1 port OC-48/ 4 port OC-12/OC-3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module
Installing a License

License Type: Permanent
License State: Active, In Use
License Count: 1/1/0 (Active/In-use/Violation)
License Priority: Medium
Store Index: 4
Store Name: Primary License Storage
#
Disabling a License
Use the no platform enable controller Mediatype <slot/bay/port> <port rate> to disable a particular license
type on the controller port.
Disabling a license is not successful if a rate is configured on the controller that requires the license. Hence,
you should first remove the controller configuration before disabling the license.
Note
To disable port licensing:
enable
configure terminal
controller sonet 0/4/16
sts-1 1
no vtg 1 t1 1 cem-group 23 unframed
no mode vt-15
controller MediaType 0/4/16
no mode sonet
exit
no platform enable controller MediaType 0/4/16 oc3
Uninstalling a License
To uninstall a license:
enable
configure terminal
no platform enable controller MediaType slot/bay/port OC3
end
license clear feature-name
Enabling T1 Controller
To enable T1 controller:
enable
configure terminal
controller mediatype 0/4/0
mode t1
end
Configuring the Controller
To configure T1 interface, use the following commands:
enable
configure terminal
controller mediatype 0/4/0
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco
IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
4
Configuring Support of 1 port OC-48/ 4 port OC-12/OC-3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module
Disabling a License

mode t1
exit
controller t1 0/4/0
clock source internal
framing esf
cablelength short 110
linecode b8zs
no shutdown
exit
Enabling T3 Controller
To enable T3 controller:
enable
configure terminal
controller mediatype 0/4/12
mode t3
end
Enabling SONET Controller
To enable SONET controller:
enable
configure terminal
controller mediatype 0/0/16
mode sonet
end
Associated Commands
The following table shows the commands for the IM configuration:
LinkCommand
Link to Command Reference Guideplatform enable controller Mediatype
<slot/bay/port> <port rate>
Additional References
Related Documents
Document TitleRelated Topic
Cisco IOS Master Commands List, All Releases
Cisco IOS commands
Cisco SFP Modules for Gigabit Ethernet Applications
Data Sheet
Compact-SFP
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
XE Fuji 16.7.x (Cisco ASR 900 Series)
5
Configuring Support of 1 port OC-48/ 4 port OC-12/OC-3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module
Enabling T3 Controller

Standards and RFCs
TitleStandard/RFC
There are no standards and RFCs for this feature.
—
MIBs
MIBs LinkMIB
There are no MIBs for this feature.
http://www.cisco.com/go/mibs
—
Technical Assistance
LinkDescription
http://www.cisco.com/cisco/web/support/index.html
The Cisco Support website provides extensive online
resources, including documentation and tools for
troubleshooting and resolving technical issues with
Cisco products and technologies.
To receive security and technical information about
your products, you can subscribe to various services,
such as the Product Alert Tool (accessed from Field
Notices), the Cisco Technical Services Newsletter,
and Really Simple Syndication (RSS) Feeds.
Access to most tools on the Cisco Support website
requires a Cisco.com user ID and password.
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco
IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
6
Configuring Support of 1 port OC-48/ 4 port OC-12/OC-3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module
Additional References

CHAPTER 2
Configuring CEM
This module describes how to configure Circuit Emulation (CEM).
•Overview of Circuit Emulation, page 7
•Configuring CEM, page 8
•Associated Commands, page 12
•Additional References for Configuring CEM, page 13
Overview of Circuit Emulation
Circuit Emulation (CEM) is a technology that provides a protocol-independent transport over IP/MPLS
networks. It enables proprietary or legacy applications to be carried transparently to the destination, similar
to a leased line.
CEM provides a bridge between a Time-Division Multiplexing (TDM) network and Multiprotocol Label
Switching (MPLS) network. The chassis encapsulates the TDM data in the MPLS packets and sends the data
over a CEM pseudowire to the remote Provider Edge (PE) chassis. As a result, CEM functions as a physical
communication link across the packet network.
The chassis supports the pseudowire type that utilizes CEM transport: Structure-Agnostic TDM over Packet
(SAToP).
L2VPN over IP/MPLS is also supported on the interface modules.
Structure-Agnostic TDM over Packet
Structure-Agnostic TDM over Packet (SAToP) encapsulates Time Division Multiplexing (TDM) bit-streams
as pseudowires over public switched networks. It disregards any structure that may be imposed on streams,
in particular the structure imposed by the standard TDM framing.
The protocol used for emulation of these services does not depend on the method in which attachment circuits
are delivered to the Provider Edge (PE) chassis. For example, a T1 attachment circuit is treated the same way
for all delivery methods, including copper, multiplex in a T3 circuit, a virtual tributary of a SONET circuit,
or unstructured Circuit Emulation Service (CES).
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
XE Fuji 16.7.x (Cisco ASR 900 Series)
7

In SAToP mode, the interface is considered as a continuous framed bit stream. The packetization of the stream
is done according to IETF RFC 4553. All signaling is carried out transparently as a part of a bit stream.
Configuring CEM
This section provides information about how to configure CEM. CEM provides a bridge between a Time
Division Multiplexing (TDM) network and a packet network, MPLS. The chassis encapsulates the TDM data
in the MPLS packets and sends the data over a CEM pseudowire to the remote Provider Edge (PE) chassis.
The following sections describe how to configure CEM.
Configuring CEM Restriction
Not all combinations of payload size and dejitter buffer size are supported. If you apply an incompatible
payload size or dejitter buffer size configuration, the chassis rejects it and reverts to the previous configuration.
CEM interface does not support idle-cas parameter.
Note
Configuring CEM Classes
A CEM class allows you to create a single configuration template for multiple CEM pseudowires. Follow
these steps to configure a CEM class:
Note •The CEM parameters can be configured either by using CEM class or on CEM interface directly.
•The CEM parameters at the local and remote ends of a CEM circuit must match; otherwise, the
pseudowire between the local and remote PE chassis does not come up.
enable
configure terminal
class cem mycemclass
payload-size 512
dejitter-buffer 12
exit
interface cem 0/4/0
cem 0
cem class mycemclass
xconnect 10.10.10.10 200 encapsulation mpls
exit
Configuring CEM Parameters
The following sections describe the parameters you can configure for CEM circuits.
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco
IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
8
Configuring CEM
Configuring CEM