The interface module operates in following two modes:

• Single XFI or 10 G mode

• Dual XFI or 20 G mode

Single XFI or 10 G mode

Consider the following requirement while working on the 10 G mode:

• OC-192 or SFP+ port is supported on the 10G GE port. In the 10G mode, 7.5G for CEM traffic is supported.

• If bandwidth is available to accommodate a particular circuit or Ethernet port, then configuration is allowed, and it can be performed. Otherwise, the configuration is rejected due to bandwidth limitation.

• When there is a change in the payload size, the required bandwidth gets modified accordingly. This in turn checks for the bandwidth and if the sufficient bandwidth is not available, the configuration is rejected.

• You can remove or delete the existing configuration from the port and perform new configuration on the port.

Dual XFI or 20 G mode

You can convert the IM into dual mode. In 20G mode of operation, channelized (xfi0) and non-channelized (xfi1) bandwidth are available.

Enter the following commands to convert into dual mode and then reload the IM:

router (config)# platform hw-module configuration
PE1(conf-plat-hw-conf)# hw-module <slot/subslot> A900-IMA1Z8S-CXMS mode 10G_CEM

Consider the following requirements while working on the 20-G mode:

• For configuring CEM group, the software performs bandwidth check. If the required bandwidth is not available, you cannot configure the CEM group.

• If a maximum capacity configuration is already performed on the IM and you update the payload size, then the update is not accepted on the same channel (xfi). You need to remove some configurations on circuits and then update the payload again.

For slot compatibility, refer Supported RSP and Slots in the Cisco ASR 900 Series Routers and Cisco ASR 920 Series Routers, and Cisco Interface Module Hardware Installation Guide.

Feature Restrictions

The following features are not supported:

• Ethernet

• EOS L1 or L2

• MS features

• DCC is not supported for the Cisco IOS XE 16.12.1 release.

• iMSG is not supported for the Cisco IOS XE 16.12.1 release. .

• STS-192c or VC-4-64c concatenation

• Low order path concatenation (VCAT)

• Fractional CEP

• BLSR for SONET or MSSP ring for SDH

• SyncE and PTP Support on EoS (L1 or L2/L3 Terminated)

• Card level protection

• Non-standard concatenation such as STS-6c, STS-9c, STS-15c, STS-18c, and so on.

• APS or MSP 1:N, where N is greater than 1

• TSOP support

• Auto detection support

• SONET to SDH and SDH to SONET Translation

• CAS Signaling

• HSPW

Management Restrictions

The following are some management restrictions to consider while configuring the module:

• The ports can be configured and used regardless of available backplane bandwidth or HO Path resources.

• Provisioning a new CEM circuit and payload size change to the new CEM circuit is allowed as long as bandwidth is available.

• Gigabit Ethernet configuration is allowed if required bandwidth is available. Bandwidth reallocation can be performed based on some following scenarios:

  • The required bandwidth is not available on channelized xfi, but sufficient bandwidth is available on non-channelized xfi. In such cases, you should remove some configuration from circuits on the channelized xfi and then provision Gigabit Ethernet followed by CEM circuit provision.

Scale Restrictions

• The maximum number of supported VT1.5 CESoP circuits are 672 per interface module for Cisco IOS XE 16.12.x release.

The ASR 900 combo 8-port SFP GE and 1-port 10 GE 20G interface module functions similar to the 1-port OC-192/STM-64 or 8-Port OC-3/12/48/STM-1/-4/-16 interface module. The configurations remain the same. For more information, refer the 1-Port OC-192 or 8-Port Low Rate CEM Interface Module Configuration Guide, Cisco IOS XE Gibraltar 16.11.x (Cisco ASR 900 Series).

The following TDM features are supported:

• SNMP

• Local, network, or remote loopback

• BERT (both system and line). The system side BERT is not supported in the framed SAToP mode.

• OH config

• Network synchronization

• SSM

• Shut at port and CEM-group level

The CEM features such as SAToP, CESoP, and CEP are supported in the following modes:

• Unprotected CEM with ACR or DCR are supported in the following modes:

  • T1, T3, E1, E3, DS0, DS1, and DS3

  • CEM Payload size configurable.

  APS CEM with ACR or DCR are supported in the following modes

  • DS0, DS1, DS3, T1, T3, E1, E3, AU-3, and AU-4

  • CEM payload size configurable.

• UPSR at VT or STS mode.

• DS1 (with VT Protection) or DS3 (STS Protection) with ACR or DCR

• CEM Class with configurable payload size or jitter buffer

Note	For more information, see the Cisco ASR 900 Series Routers and Cisco ASR 920 Series Routers, and Cisco Interface Module Hardware Installation Guide.