Comdial FX Series Especificaciones descargar pdf (Pagina 230)

VMMI Programming Exercises

GCA39-082 Rev 2, Issue 9/01 Page 22 Printed in the USA

Comdial makes the following boards that are capable of using E & M tie lines:

Board Comments

FXEMDD-DF

FXEMDD-MF

The FXEMDD-DF/MF boards are analog boards that

provide two wires for a tip and ring voice circuit and two

wires (the E & M line) to provide control signaling

between the systems.

When a local FX or DXP puts a request for service from

the remote equipment on the M lead, the remote

equipment detects this request on its E lead. As an

option it can also respond by putting an alerting signal on

its M lead.

DXPT1 and FXT1 The digital T-1 boards provide several line options on a

per channel basis, the E & M tie lines only being one of

those options. When you connect two Comdial systems

together using E & M protocol through the T1 lines,

designate one as the master and the other one as the

slave. In this application, only the slave system requires

a synchronizing card.

DXP Multi-purpose board

If you plan to use tone dial configured E & M lines with any of the boards mentioned above, you

may need to install one or more DTMF receiver cards into the Comdial system being used with

the tie lines. Typically, you will need one DTMF receiver for every 6 lines.

Connection and Signaling Considerations

Connection Types

The FX and DXP support two different types of E & M lines. The E & M Direct type is for

direct connection between two telephone systems. It is also known as a metallic connection. The

E & M Carrier type is for tie lines that run through a central office (CO) interface.

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Comdial FX Series Especificaciones Pagina 230