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Introduction Passport 4400 Hardware Installation Manual
1-3
Ethernet Base Module
The Ethernet Base Module performs central processing functions for the
Passport 4400 unit. This module must be present in the lowest slot in the unit.
The Ethernet Base Module provides support for the following:
• Processor and memory
• Serial access port
• Management port
• 10BASE-T Ethernet interface
• Optional plug-in SIMMs
— 16 Mbyte Flash Memory SIMM
– Passport 4430/4450 - NTBQ69AA
– Passport 4455 - NTBQ70AA
— 16 Mbyte DRAM SIMM - NTAU95AA
— Data Compression SIMM - NTAU94AA
Refer to Chapter 3, Ethernet Base Module, for more detailed information
concerning this module and the optional plug-in SIMMs.
Data Modules
Data Modules are installed in the slots above the Ethernet Base Module (slots
B, C, D, E). They consist of the following modules:
• High-speed Data Module
— 8-Port High Speed Data Module (HDM) - NTAU74AA
— 4-Port High Speed Data Module (HDM) - NTAU83AA
• Legacy Data Modules
— 6-Port Legacy Data Module (LDM) - NTAU73AB
— 6-Port Legacy Data Module with Token Ring (LDM) - NTAU71AB
— 8-Port Legacy Data Expansion Module (LDEM) - NTAU77AB
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.24, V.35, V.36, and X.21 interfaces, determined by the cable used. The HDM
can support both DTE and DCE modes.
Legacy data modules include the Legacy Data Module (LDM) and the Legacy
Data Expansion Module (LEM). The LDM and LEM provide legacy protocol for
branch sites connected to a Passport only network (usually one which includes
a Passport 6000 unit). These include FR, X.25, ITI, TR, SNA, SDLC, DTDS and
HTDS. The LDM provides six legacy service ports; the LEM provides an
additional eight ports.
Refer to Chapter 4, Data Modules, for more detailed information concerning
these modules.