Cisco Cisco IOS Software Release 12.2(2)XA

Signaling transparency

Channel-associated signaling (CAS) and common channel signaling (CCS) support

The number of virtual path identifier (VPI) and virtual channel identifier (VCI) bits must equal 13 
bits. The VPI default is five bits with a range of 0 to 31 bits; the VCI default is eight bits with a range 
of 1 to 256 bits.

For variable bit rate real time VBR (RT) traffic shaping, the maximum burst size (MBS) is 255 cells.

Subcell multiplexing is defaulted and not configurable.

AAL2 supports a permanent virtual circuit (PVC); AAL5 supports PVC and a switched virtual 
circuit (SVC).

If all of the 60 channels for transparent common-channel switching (TCCS) and transparent 
channel-associated signaling (TCAS) over AAL2 are configured, you cannot save the configuration 
into NVRAM. The configuration must be compressed to save it to the start up.

The number of AAL2 VCs is limited to 16. Each VC supports up to 255 subchannels, and each 
subchannel can be used for voice port. 

Cisco IOS Voice, Video, and Fax Configuration Guide, Release 12.2

Cisco IOS Voice, Video, and Fax Command Reference, Release 12.2

Cisco IOS Wide-Area Networking Configuration Guide,  Release 12.2

Cisco IOS Wide-Area Networking Command Reference,  Release 12.2

Cisco 2600 series

No new or modified standards are supported by this feature.

No new or modified MIBs are supported by this feature. The Chassis MIB has been modified to support 
the High Performance ATM AIM.

For descriptions of supported MIBs and how to use MIBs, seethe Cisco web site on CCO at 
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.

No new or modified RFCs are supported by this feature.