Technical data

Overview of the ATMSpeed/155 Modules and Media Dependent Adapters
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ATMSpeed/155 MMF Switch Module
The ATMSpeed/155 MMF Switch Module (Figure
1-2) provides four ATM ports
on each module. Onboard connectors include four OC-3 ports with SC connectors
for multimode fiber (MMF) interfaces.
ATMSpeed/155 MCP Switch Module
In addition to connectivity provided by four ATM ports, the ATMSpeed/155 MCP
Switch Module (Figure
1-2) manages the Centillion 100 switch. One (and only
one) MCP module is required for each Centillion 100 chassis; however, a
TokenSpeed/MCP or an EtherSpeed/MCP module could also be used to meet this
requirement.
Onboard connectors include OC-3 ports with SC connectors for multimode fiber
(MMF) ATM interfaces. The ATMSpeed/155 MCP module has both a serial port
(Mini DIN 8) and a 10BASE-T port (RJ-45) to connect a network management
station.
ATMSpeed/155 MDA Switch Module
The ATMSpeed/155 MDA Switch Module (Figure
1-3) provides two slots for
installing MDAs to provide ATM port connections. Each MDA provides two
OC-3 ports; a fully equipped MDA switch module therefore has four ports for
making ATM connections. You can install different MDAs in one MDA host
module as needed to obtain maximum flexibility of connection types.
The MDA switch module provides different types of ATM connectivity through
the following MDAs:
• A multimode fiber optic MDA (Model 5720-14 MDA) provides synchronous
optical network/synchronous digital hierarchy (SONET/SDH) synchronous
transport signal-3c (STS-3c/OC-3c) connectivity over 62.5/125 µ m or 50/125
µ m multimode fiber cable.
• An unshielded twisted pair (UTP) MDA (Model 5720-15 MDA) provides
SONET/SDH STS-3c/OC-3c connectivity over Category 5 UTP cable.
Note: The 10BASE-T Ethernet port on the ATMSpeed/155 MCP module is
not supported by the switch software at this time. It will be supported in a
future release.