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Data Modules Passport 4400 Hardware Installation Manual
4-3
Legacy Data Expansion Module
The Legacy Data Expansion Module (NTAU77AB) offers additional interface
ports that support Legacy Data protocol in your Passport 4400 unit.
Note:
The connections will depend on the specific site requirements. If
you are not sure of the exact connections required for the
Passport 4400 unit, consult your system administrator.
Use a 50-pin connector to join each serial data port to your local equipment. The
type of cable used will depend on the class of service you desire. Refer to
Appendix A, Cable Diagrams, of this manual.
Figure 4-2. Legacy Data Expansion Module
Memory Expansion Module for Legacy Data Module
For Passport 4400 units containing a Legacy Data Module and one or more
Legacy Data Expansion Modules, you must order an LDM Memory Expansion
Module for the Legacy Data Module. This module provides 1 Mbyte of SRAM
memory required to support the additional ports provided by the Legacy Data
Expansion Module.
Installation Procedure for the Memory Expansion Module
The following procedure explains how to install a Memory Expansion Module
on the Legacy Data Module already installed in the Passport 4400 unit.
For information on opening the unit and removing/installing modules, refer to
Chapter 10, General Installation.
Caution:
!
Modules cannot be inserted into or removed from the unit while
the Passport 4400 unit is operating. This could cause damage to
the unit or interruption of network service or both.
Back
Indicators
Stacking Connectors
Rear View
Data Ports
50-pin Connectors
(see Figure 3-5 on
page 3-5 for pin
assignments)
Module Switch Group
(see Figure 10-1 on
page 10-4)