Filter
Top Products
T1, E1, and Digital Voice ModulesPassport 4400 Hardware Installation Manual
5-10
Digital Voice Expansion Module
The Digital Voice Expansion Module (DVEM - NTAY18AA) is used to extend
the number of voice channels supported by a T1 or E1 Voice Module. Each Digital
Voice Expansion Module can accommodate up to a maximum of 12 additional
Digital Voice Modules. By combining the Digital Voice Modules installed on the
T1 or E1 Voice Module, and those installed on Digital Voice Expansion Modules,
the Passport 4400 unit can support all the digital voice channels provided by a
full T1 (24 channels) link or E1 (30 channels) link.
Note:
The Digital Voice Expansion Module must be physically
installed directly on top of the T1/E1 Voice Module or another
Digital Expansion Module.
The Passport 4450/4455 can house a maximum of three Digital Voice Expansion
Modules, while the Passport 4430 can house two Digital Voice Expansion
Modules.
Note:
The connections will depend on the specific site
requirements. If you are not sure of the connections required
for the Passport 4400 unit, consult your system administrator
or refer to the following:
• Chapter 11, Connecting a Workstation.
• Appendix A, Cable Diagrams.
• Appendix B, Agency and Telephone Company Requirements.
• Appendix D, T1 Voice Module Cabling Requirements.
Caution:
!
The following applies to connecting the DVEM Power Harness:
•
Do not
connect the Digital Voice Expansion Module
Power Harness to the T1/E1 Voice Module.
•
If your Passport 4450/4455 unit contains only one Digital
Voice Expansion Module, there will be an additional,
unused connector on the power harness. Leave the spare
connector unconnected.