3Com 3C63400-3AC-C - PathBuilder S700 Switch, Справочное руководство

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80 C
HAPTER
4: P
ATH
B
UILDER
S700 M
ODULE AND
A
PPLICATION
O
VERVIEW
DS3 UNI Module
Overview
The DS3 module is compatible with AT&T Publication 54014 specifications, uses
the unchannelized format, and is compliant to M23 or the C-bit parity ANSI-107a,
1991 specifications. It performs the following key functions:
n
Provides line interface functions and terminates the FEAC and MDL for the
C-bit format
n
Performs ATM to physical layer mapping and adds PLCP according to UNI 3.0
n
Performs peak traffic shaping on the transmit (14 bulk shapers)
E3 UNI Module
Overview
The E3 UNI module is typically used for terminating/accessing public or private
WAN services. However, depending on your local applications, you can also use
this module in the port slot for taking local traffic across the WAN.
The E3 UNI module performs the following key functions:
n
Performs ATM to physical layer mapping and adds PLCP according to UNI 3.0
n
Performs peak traffic shaping on the transmit (14 bulk shapers)
OC3/STM-1 UNI Module
Overview
There are two versions of the OC3/STM-1 module: multi-mode fiber and
single-mode fiber. The multi-mode fiber module is typically used for connecting
ATM LAN equipment such as 3Com CoreBuilder 7000. The single-mode fiber
module is typically used for WAN ATM services, providing a longer reach in terms
of distance. Both version support the European SDH framed optical networks
(STM-1).
The OC3/STM-1 UNI module provides an ATM connection at up to 155 Mpbs and,
like other UNI modules, it supports multiple traffic shaper values.
DS1/E1 UNI with IMA
Module Overview
The DS1/E1 UNI module provides Inverse Multiplexing of ATM cell streams over
multiple T1/E1 physical links, based on the industry standard ATM Forum
Specification. It provides the following key benefits:
n
Uses a cell-based multiplexing technique to convert a single ATM stream into
multiple lower speed ATM streams to be sent over independent links and
retrieve the initial ATM cell stream from the links at the far end
n
Preserves cell order from end-to-end in the ATM layer
n
Supports up to 8 DS1/E1 ports (n = 1 to 8)
n
Supports multiple IMA groups
n
Supports differential delay tolerance up to 70ms for DS1 and 56ms for E1
n
Handles link addition/deletion, failure/recovery with minimal disruption
n
Provides ATM Forum specified performance statistics
Application Module
Overview
The PathBuilder S700 supports the following application modules:
n
Ethernet (Dual Ethernet Module)
n
CBR (DSX-1 CBR, E1 CBR)
n
Frame Relay (QSIM, HSIM, FAM)