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Chapter 3 - Front and Rear Panel Descriptions
Voice/Fax Channels
FXS (Foreign Exchange Station) This indicator lights when the voice/fax channel is configured
for FXS operation.
FXO (Foreign Exchange Office) This indicator lights when the voice/fax channel is configured
for FXO operation.
E&M (E&M Operation) This indicator lights when the voice/fax channel is configured for E&M
operation (voice/fax channel 1 only).
FAX (Fax) This indicator lights when there is fax traffic on the voice/fax channel.
XMT Transmit. This indicator lights when voice or fax data is being transmitted.
RCV (Receive) This indicator lights when voice or fax data is being received.
XSG (Transmit Signal) This indicator lights when the FXS-configured channel is off-hook, the
FXO-configured channel is receiving a ring from the telco, or the M lead is active when the voice/
fax channel is configured for E&M operation (i.e., the DataTalker is receiving a ring from the
PBX).
RSG (Receive Signal) This indicator lights when the FXS-configured channel is ringing or the E
lead is active on the E&M-configured channel.
Composite Link Status
RXT (Retransmit) This indicator lights when the local DataTalker is retransmitting a block of data
on request. The RXT indicator lights for both internal and external link devices.
FCR (Flow Control Received) This indicator lights when the remote DataTalker’s buffers are full
and the local DataTalker has been told to stop sending data. This indicator lights for both internal
and external link devices.
RD (Remote Down) This indicator lights when the local DataTalker cannot establish
communications with the remote DataTalker. The RD lights for both internal and external link
devices.
TM (Test Mode) This indicator lights when one of the diagnostic tests is active.
V35 (V.35 Interface) This indicator lights when the V.24/V.35 shunt is in the V.35 position.
EXT (External) This indicator lights when the DataTalker is configured for an external composite
link device (DIP switch 2 is down).
MDM (Modem) This indicator lights when the internal composite link device is a modem.
DSU (Data Service Unit) This indicator lights when the internal composite link device is a DSU.
TA (Terminal Adapter) This indicator lights when the internal composite link device is an ISDN
terminal adapter.
CD (Carrier Detect) This indicator lights when the composite link detects a carrier signal from a
remote DataTalker or a local external DSU or modem.
RCV (Receive) This indicator flashes as data is being received from a remote DataTalker. The
RCV indicator flashes for both internal and external link devices.
XMT (Transmit) This indicator flashes as data is being transmitted to the remote DataTalker. The
XMT indicator flashes for both internal and external link devices.
CTS (Clear To Send) This indicator lights when the composite link device is ready to transmit
data. The CTS indicator lights for both internal and external link devices.