User guide

35
Chapter 3 - Front & Rear Panel Descritpions
3.3 LED Indicators
Command Modem
Indicator Description
CD Indicates the local command modem has detected a
carrier signal from a remote modem.
RCV/XMT Indicates that the command modem is on-line by
flashing with data activity between the two command
modems.
OH Indicates that the dial-up line for the command
modem is off-hook.
DTR Indicated that the command modem is ready to
communicate.
External Composite Link
CD The Carrier Detect (CD) indicator is used when the
MultiMux MMH900 series is configured for an
external composite link device and a carrier signal is
detected.
RCV/XMT The Transmit (XMT) and Receive (RCV) indicators
are used when the MultiMux MMH900 series is
configured for an external composite link device and
the network is on-line by flashing with data activity
between the two multiplexers.
CTS The Clear To Send (CTS) indicator is used when the
MultiMux MMH900 series is configured for an
external composite link device and the composite
link device is ready to transmit data.
V.35 The V.35 indicator is used when the MultiMux
MMH900 series is configured for an external
composite link device which uses a V.35 interface.
The V.24/V.35 shunt has to be in the V.35 position
for this LED to light.