3Com 3C63400-3AC-C - PathBuilder S700 Switch, Reference Manual, Page: 21 / 272

Introducing the PathBuilder S700 7
Because the STX module allows any-to-any port switching, there is no distinction
between port and trunk modules for the PathBuilder S700. Thus, the slot
assignments are as follows:
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Slot 1 contains the Management CPU (MCPU). This slot is permanently
allocated. The MCPU manages the configuration database, network
management (via Text User Interface and SNMP), and software download
capabilities.
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Slot 3 contains the STX Module. This slot is permanently allocated.
Slots 2 and 4 are reserved for redundant MCPU and STX modules, which will be
supported in subsequent releases.
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Slots 5-18 contain the application modules.
Each module incorporates an RISC-based processor for processing packets/cells,
communication information, and statistics.
The S700 supports selected rear redundant application modules (T1/E1 and
DS3/E3). You can use front connector modules (identical to those used in the
PathBuilder S600) as well as the rear redundant modules, but only the rear
connector types will support the redundant operation available in subsequent
releases.
The S700 supports the following ATM and application modules:
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DS3 UNI module (front or rear connector)
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E3 UNI module (front or rear connector)
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OC3/STM-1 UNI module (front connector)
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DS1 UNI with Inverse Multiplexing for ATM (IMA) (front or rear connector)
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E1 UNI with Inverse Multiplexing for ATM (IMA) (front or rear connector)
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Dual Ethernet module (front connector)
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DSX-1 CBR (Constant Bit Rate) module (4 port or 8 port) (front or rear
connector)
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E1 CBR (Constant Bit Rate) module (4 port or 8 port) (front or rear connector)
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QSIM (Quad Serial Interface Module) (QSIM) - V.35/RS422/EIA530/X.21 (front
connector)
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HSIM (HSSI Serial Interface Module) (front connector)
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DS1 FAM (Frame Access Module) - (front connector)