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Configuring T1 and E1 Trunk Modules
Introducing the T1 and E1 trunk modules
Introducing the T1 and E1 trunk modules
Two versions of the OC3-ATM trunk module are produced. One version is for use in
the Stinger MRT 23, a second version is for use in the Stinger MRT 19 chassis. These
versions are not interchangeable. For information about the product numbers for
these modules, and for the optional software described in the following paragraphs,
see "Stinger MRT models and optional products" on page 1-2.
All T1 and E1 trunk modules contain eight RJ-48 connectors.
A T1 or E1 module supports two ATM connection modes:
UNI mode. Each individual T1 or E1 interface can connect to one or more ATM
links through User-to-Network Interface (UNI) ports.
IMA mode. The module can use inverse multiplexing to aggregate the bandwidth
of up to eight T1 or E1 interfaces as a single logical port for one or more ATM
links. Up to four inverse multiplexing over ATM (IMA) groups can be created.
In this guide, a T1 or E1 interface configured in UNI mode or a group of T1 or E1
interfaces configured in IMA mode is referred to as a logical port.
With inverse multiplexing, ATM cells are distributed in round-robin fashion across
multiple T1 or E1 interfaces. This distribution method allows the total bandwidth of
multiple T1 or E1 lines to be used for outgoing ATM traffic from a Stinger MRT unit
when the full bandwidth of a DS3, E3, or OC3 line is not needed.
Overview of supported features
A T1 or E1 trunk module for a Stinger MRT unit has the following capabilities and
compliances:
Eight active T1 or E1 ports
Support for up to 384 virtual channels (VCs), or up to 384 virtual channels per
port, in UNI or IMA mode
Quality of service (QoS) support for constant bit rate (CBR), variable bit rate
(VBR)-real time, VBR-nonreal time, and unspecified bit rate (UBR) service
categories
Cell buffers of up to 8MB for both incoming and outgoing traffic
Traffic policing by means of the dual leaky bucket algorithm, also known as the
generic cell rate algorithm (GCRA)
Traffic shaping for each logical port in both UNI and IMA modes
Operation, Administration, and Maintenance (OAM) support
Local and remote loopback testing functions
Compliant with the following standards:
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–
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9-2
ITU-T I.432 recommendation for performing ATM framing by cell delineation
ITU-T G.803 and G.804 recommendations for performing cell mapping into
T1 and E1 transmission systems
ATM Forum T1 physical interface specification AF-PHY-0016.000 (T1
models)
ATM Forum E1 physical interface specification AF-PHY-0064-000 (E1
models)
Stinger® MRT Getting Started Guide
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