Cisco ISE - Line Card ISE Manual de usuario descargar pdf (Pagina 22)

Cisco IOS SoftwareConfiguration for theCisco 12000 SeriesOne-Port Channelized OC-12/STM-4(DS1/E1) ISE Line

How to Configure Layer 1 Features

Cisco IOS Release 12.0(27)S1

Configuring Attributes Under SDH Framing

Procedures and examples for configuring attributes under SDH framing are presented in the following

sections:

• Configuring the Mapping of an Administrative Unit Group (AUG), page 22

• Configuring a TUG-3 or AU-3, page 22

Configuring the Mapping of an Administrative Unit Group (AUG)

In SDH, there are two possible mapping/multiplexing schemes for most payload types: ANSI and ETSI.

In ANSI mapping, the Low Order payloads are aggregated into a VC-3 High Order Path. An AU pointer

is added to the VC-3 to create an AU-3 (Administrative Unit type 3). Three such AU-3s are then

synchronously multiplexed into an AUG (AU group). The multiplexing scheme is as follows:

…VC-3 to AU-3 (x3) to AUG to STM-1

SDH ANSI mapping is very similar to the SONET frame structure.

In ETSI mapping, the Low Order payloads are aggregated into a VC-4 High Order Path. An AU pointer

is added to the VC-4 to create an AU-4 (Administrative Unit type 4). One AU-4 is “multiplexed” into an

AUG (AU group), which is to say, the AUG is, in fact, equivalent to an AU-4. The multiplexing scheme

is as follows:

…TUG-3 (x3) to VC-4 to AU-4 (x1) to STM-1

To specify the AUG mapping, use the controller command aug mapping {au-3 | au-4}. The default is

operation using AU-4 mapping.

Note This command is available only when SDH framing is configured.

The example that follows selects AU-3 mapping for port 1 of the 1-Port CHOC-12 ISE line card in slot

2 of a Cisco 12000 Series Router:

Router(config)# controller sonet 2/0

Router(config-controller)# framing sdh

Router(config-controller)# aug mapping au-3

Configuring a TUG-3 or AU-3

Under SDH framing with AUG mapping set to AU-4, the VC-4 High Order Path comprises three

TUG-3s. Each TUG-3 can be configured to carry up to 21 E1s, mapped into VC-12s. The mode of

operation of a TUG-3 is not configurable, and defaults to mode c-12.

Under SDH framing with AUG mapping set to AU-3, each VC-3 High Order Path can be configured to

carry up to 28 T-1s, mapped into VC-11s. The mode of operation of an AU-3 is not configurable, and

defaults to mode c-11.

Note When configured for SDH framing, the 1-Port CHOC-12 ISE line card supports

channelization to E1s when the AUG mapping is set to AU-4, and channelization to T-1s

when the AUG mapping is set to AU-3. Different combinations of payload types and AUG

mappings are not supported.

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Cisco ISE - Line Card ISE Manual de usuario Pagina 22