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How to Configure the ATM T3/E3 Network Module
Classes of Service
ATM resources can be specified dynamically on a per-connection basis (per SVC). The ATM T3/E3
network module supports four classes of service:
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How to Configure the ATM T3/E3 Network Module
To configure the ATM T3/E3 network module, complete the following procedures:
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Configuring the Card Type
To configure the ATM T3/E3 network module for T3 or E3 operation, perform the following tasks.
The ATM T3/E3 network module will not be operational until a card type is configured.
Note
SUMMARY STEPS
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Cisco IOS Release 12.4(15)T
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Constant Bit Rate (CBR): This class emulates circuit switching. CBR has the highest transport
priority, which is 0. CBR can be used for connections such as voice and video. This bandwidth is
characterized by peak cell rate (PCR).
Variable Bit Rate (VBR): VBR is available in non-real-time (VBR-nrt) and real-time (VBR-rt). VBR
has the second highest transport priority, which is 1. VBR sends traffic at a rate that varies with time,
depending on the availability of user information.
Available Bit Rate (ABR): ABR has the transport priority of 2. ABR provides rate-based flow
control and is aimed at data traffic.
Unspecified Bit Rate (UBR): UBR has the transport priority of 3. UBR is a "best effort" class of
service that uses the unutilized bandwidth for a connection. Traffic categorized as UBR+ is
guaranteed a minimum line rate through the minimum cell rate (MCR) traffic parameter.
Configuring the Card Type, page 4
Changing the Card Type, page 5
Enabling the ATM Interface, page 7
Configuring PVCs, page 7
enable
configure terminal
card type {t3 | e3} slot
Configuring the Cisco NM-1A-T3/E3 Network Module
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