Key Features Of The Stx Module - 3Com 3C63100-AC-C - PathBuilder S600 Bridge/router Reference Manual

Key Features of the STX
Module
Slot 1 contains the Management CPU (MCPU). This slot is permanently
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allocated. The MCPU manages the configuration database, network
management (via Text User Interface and SNMP) and software download
capabilities.
Slot 2 contains the STX Module. This slot is permanently allocated.
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Slots 3-6 contain the application modules.
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All modules are front-loading with a direct cable attachment on the front of each
card, and each module incorporates an RISC based processor (30 MIPs each) for
processing packets/cells, communication information, and statistics. The unit
accommodates up to 2 power supplies (AC 110/220 VAC & DC -48 VDC) in a
redundant configuration.
The S600 supports the following ATM and application modules:
DS3 UNI module
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E3 UNI module
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OC3/STM-1 UNI module
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DS1 UNI with Inverse Multiplexing for ATM (IMA)
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E1 UNI with Inverse Multiplexing for ATM (IMA)
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Dual Ethernet module
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CBR (Constant Bit Rate) DSX module (4 port or 8 port)
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CBR (Constant Bit Rate) E1 module (4 port or 8 port)
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QSIM (Quad Serial Interface Module) (QSIM) - V.35/RS422/EIA530/X.21
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HSIM (HSSI Serial Interface Module)
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FAM (Frame Access Module) - DS1
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The STX module includes a switching matrix that provides sophisticated traffic
management, priority queuing, and multicasting. Once an application module
SARs its traffic into ATM cells, the STX receives the cells and performs address
lookup for switching, queuing, traffic shaping, traffic policing, early packet
discard, and multicasting. The STX module provides the following functions to the
PathBuilder S600:
Provides any-to-any port switching.
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Supports Deep buffers (192,000 cell buffers per module) for queuing.
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Introduces virtual interfaces (VIs)—logical UNI ports—and supports up to 24 VIs
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per application module and up to 2 VIs for the MCPU module. The VIs provide
traffic shaping profiles.
Provides priority queuing in which each VI can be assigned to specific VCs
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which then can be allocated to one of 4 queues.
Supports per VC and/or per VP traffic shaping.
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Supports per VC traffic policing.
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Supports multicasting (up to 256 connections with 32 leaves).
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Includes a Bits timing clock.
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Supports per VC statistics.
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Allows a total of 8,000 connections per unit.
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PathBuilder S600 with STX Overview 21