Instruction manual

100DCD Module
4-8
Installation, SPM, Maintenance, and Troubleshooting Supplement
TD-A, TD-B Transmit Data, differential pair, data
transmitted to the DCE.
DSR Data Set Ready, DCE activated and ready to
operate.
CTS-A, CTS-B Clear To Send, differential pair, indicator to
DTE that DCE is ready to receive data.
RLSD-A, RLSD-B Receive Line Signal Detect, differential pair,
activated by the DCE to indicate that a
communications channel exists.
TT-A, TT-B Transmit Clock, differential pair, DTE sourced
timing reference for TD-A/B.
RTS-A, RTS-B Request To Send, differential pair, indicator to
DCE that the DTE is ready to transmit data.
LL Local Loopback.
DTR Data Terminal Ready. DTE activated and
ready to operate.
RL Remote Loopback.
TM DCE Test Mode indicator to DTE.
SIG-GND Common ground reference for balanced
circuits on the data interfaces.
FRAME-GND Protective ground, equipment frame ground.
Table 4-4. Data Port Interface Signal Descriptions