Cisco Systems OL-7396-01 Manual De Usuario
19-34
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 19
Configuring Circuit Emulation Services
Configuring T1/E1 Structured (n x 64) Circuit Emulation Services
Dst: atm addr 47.0091.8100.0000.00e0.4fac.b401.4000.0c81.8030.00
Configuring a Soft PVC for Structured CES with CAS Enabled
Since the CES T1/E1 port adapter emulates CBR services over ATM networks, it must be able to support
channel-associated signalling (CAS) information that is introduced into structured CES circuits by PBXs
and TDMs. An optional CAS feature for the CES T1/E1 port adapter meets this requirement.
channel-associated signalling (CAS) information that is introduced into structured CES circuits by PBXs
and TDMs. An optional CAS feature for the CES T1/E1 port adapter meets this requirement.
CAS information carried in a CBR bit stream can be configured with a CES module, as follows:
•
The optional CAS feature is not enabled (the default state). For information about configuring a
soft PVC for structured CES without CAS enabled, see the
soft PVC for structured CES without CAS enabled, see the
•
The optional CAS feature is enabled, but without the optional, Cisco-proprietary on-hook detection
feature enabled. This option is described in the following procedure.
feature enabled. This option is described in the following procedure.
•
Both the optional CAS and on-hook detection features are enabled. For information about
configuring a soft permanent virtual channel (soft PVC) for structured CES with both CAS and
on-hook detection enabled, see
configuring a soft permanent virtual channel (soft PVC) for structured CES with both CAS and
on-hook detection enabled, see
.
Note
For a detailed description of CAS operation and the on-hook detection feature, refer to the circuit
emulation services topic in the Guide to ATM Technology.
emulation services topic in the Guide to ATM Technology.
This section describes how to configure a soft PVC for structured CES with channel-associated
signalling (CAS) enabled.
signalling (CAS) enabled.
Note
Typically you will configure a soft PVC between CES modules anywhere in your network. For
simplicity, this example and the accompanying procedure describe how to create a soft PVC between
modules in the same ATM switch router chassis.
simplicity, this example and the accompanying procedure describe how to create a soft PVC between
modules in the same ATM switch router chassis.
The following procedure is based on the following assumptions:
•
The source (active) side of the soft PVC (CBR-PVC-A) remains as previously configured.
•
The destination (passive) side of the soft PVC (CBR-PVC-B) remains as previously configured.
•
Four time slots (DS0 channels) remain as previously configured for the soft PVC:
–
For circuit CBR-PVC-A: DS0 channels 1 to 3 and 7 are used on port CBR3/0/0.
–
For circuit CBR-PVC-B: DS0 channels 10 to 13 are used on port CBR3/0/3.
•
CAS is enabled for the circuit.
•
The signalling mode for the T1 CBR ports is set to “robbedbit.”
shows a soft PVC configured for structured CES with CAS enabled.