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19-2
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter19 Configuring Circuit Emulation Services
Overview of CES T1/E1 Interfaces
Overview of CES T1/E1 Interfaces
You can use CES T1/E1 port adapters for links that require CBR services, such as interconnecting PBXs,
time-division multiplexers (TDMs), and video conference equipment over campus, public, or private
networks.
This section provides an overview of the hardware features and functions supported on the CES T1/E1
port adapters.
Clocking Options
You can configure each interface on the port adapter to support the following clocking options:
• Self-timing based on a stratum 4 level clock
• Loop timing from the received data stream—ideal for public network connections
• Timing synchronized to a selected master clock port—required to distribute a single clock across
anetwork
Interfaces Supported
The number of CES T1/E1 interfaces you can configure is platform dependent:
• Catalyst 8540 MSR—up to 64 CES T1/E1 interfaces
• Catalyst 8510 MSR and LightStream 1010—up to 32 CES T1/E1 interfaces
Connectors Supported
The CES T1 port adapters support UTP connectors and the CES E1 port adapters support UTP, foil
twisted-pair, or 75-ohm BNC connectors. Status and carrier-detect LEDs on each port give quick, visual
indications of port status and operation. For detailed network management support, comprehensive
statistics gathering and alarm monitoring capabilities are provided.
Functions Supported by CES Modules
The functions supported by a CES module include the following:
• Circuit emulation services interworking function (CES-IWF), which enables communication
between CBR and ATM UNI interfaces
• T1/E1 CES unstructured services
• T1/E1 CES structured services
Note The Cisco IOS release 12.1(22)EB and later releases for the Catalyst 8540 MSR, Catalyst 8510 MSR,
and LightStream 1010 ATM switch router support the ATM Forum CES IWF MIB and SNMP agent
code. All the MIB objects described in the ATM Forum CES Interoperability Specification, Version 2.0,
are supported except the following objects:
• atmfCESBufMaxSize
• atmfCESCellLossIntegrationPeriod