Clear-Com PL-PRO EF-1M, Инструкция по эксплуатации

Страница: 21 / 55

E F - 1 M I N T E R F A C E 3 - 2
Note that when the EF-1M is set to Matrix Direct mode (mode-switch 1 ON), the
internal baud rate jumpers have no effect. The transmission rate is automatically set to the
19.2 kilobaud rate required for Matrix communication.
If you set mode-switch 2 on the EF-1M’s rear panel to the ON position, the 20-kHz call
signal is selected and audio levels are adjusted for connection to RTS-TW lines. If you set
mode-switch 2 to the OFF position, the DC voltage call signal is selected and line levels
are optimized for Clear-Com.
Shorting pins 8 and 15 of the DB-15 connector on the EF-1M’s back panel will also
select the 20-kHz call signal and adjust audio levels for connecting to RTS-TW lines.
When you short pins 8 and 15, set mode-switch 2 to the OFF position.
CONNECTING THE EF-1M TO A MODEM
The first step in connecting the EF-1M to a fiber-optic modem is to wire the DB-15 jack
to the appropriate connector(s) for that modem.
The modem’s connectors may be terminal blocks, XLR jacks, or co-axial connectors.
Four-pair twisted cable or shielded-pair cable may be required. Check the operations
manual for the modem. For unshielded, twisted-pair cable (UTP), Category 3, 5, or
higher is acceptable if used within the distance limitations specified by the modem’s
manufacturer for this application.