Clear-Com EF-701M - Manual (Page 24)

2 - 2 E F - 7 0 1 M I N T E R F A C E
Note that when the EF-701M 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-701M’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-701M’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-701M TO A MODEM
The first step in connecting the EF-701M 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.