User Guide
DVS-21
02/2018
• V.1.0 • L. Wolle
40/131
© 2017 ProCom
®
Professional Communication & Service GmbH • Technical changes reserved.
7.5 4NSA
Audio Frequency (AF) interface module, serial, analog, for connecting four ProCom stations in 4-wire
technology, including fuse, each with a modem interface electrically isolated and short circuit proof.
Level incoming
AF input gain (from the external device to the module)
Level outgoing
AF output attenuation (from module to external device)
Operation mode
Modem (Master)
Operating as a transmission line (master)
Modem (Slave)
Operating as a transmission line (the opposite
side master)
no Modem
with pure AF frequency, the modem can be
disabled
AF controlling
Activation of self-monitoring and adjustment of
the measurement interval.
The monitoring is done by playing and
receiving a measurement frequency via the
speaker and the microphone unit. The initiation
and evaluation of the received frequency is on
the module.
Display and control elements:
LEDs
GREEN - ON
Incoming
connection is
active
GREEN - FLASHING
Outgoing
connection is
active
GREEN - FLASHING (slow) Faulty connection
GREEN - OFF
Idle state
GREEN - ON
Ready power
supply (48V)
GREEN - OFF
Fuse burn-out
(48V)
Line fuses
Microfuse of the
supply voltage for
connected devices
