Nortel Networks Passport 4400 - Manual (Page 13)

Introduction Passport 4400 Hardware Installation Manual
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Passport 4400 units are available for use with either ac or dc current, and a
redundant power supply option is available on the 5-slot models. Passport 4400
units are available in the following configurations:
• 4430ac, 3-slot, Ethernet interface, ac power
• 4450ac, 5-slot, Ethernet interface, ac power
• 4450dc, 5-slot, Ethernet interface, dc power
• 4450acR, 5-slot, Ethernet interface, ac power with redundant power
supply
• 4450dcR, 5-slot, Ethernet interface, dc power with redundant power
supply.
The chassis houses the modules that provide the various access services offered
by the 4400. The number of slots indicates the maximum number of modules,
including the base module, that can be supported by each unit.
Ethernet Base Module
The Ethernet Base Module performs central processing functions for the 4400.
This module must be present in the lowest slot in the unit for any of the other
modules to function.
The Ethernet Base Module includes the following:
• processor and memory
• serial access port
• management port
• AUI and 10BaseT Ethernet interfaces
• optional plug-in interface modules.
Data Modules
The Passport 4400 supports two types of data modules:
• High-speed Data Module
• Low-Speed Data Services Modules.
The High-speed Data Module (HDM) provides additional port capability, identical
to Port 1 on the Ethernet Base Module. The module supports RS-232, V.35, V.36,
and X.21 interfaces, determined by the cable used. The HDM can support both
DTE and DCE modes.