User manual

Configuring and Monitoring Through the LCD
4-12 Campus-RS Fractional Interface Card User Manual
CONFIGURING OUTPUT CONTROL SIGNALS
The fractional interface cards provide four standard output control signals:
• RLSD (Receive Line Signal Detect)
• TM (Test Mode)
• DSR (Data Set Ready)
• CTS (Clear to Send)
The operation of each control signal depends upon the specific operating
mode selected. Each control signal can be individually configured for one of
three modes:
• ON forces the control signal to remain on permanently, regardless of any
other control signal activity or changes in unit status.
• OFF forces the control signal to remain off permanently, regardless of
any other control signal activity or changes in unit status.
• STD sets to signal according to the standard rules for control signal
operation found in RS-449 and RS-530 interfaces, as described below:
– RLSD is on as long as the HDSL link is synchronized. If the HDSL
link is not synchronized, then RLSD is off.
– TM is on whenever a loopback function is active at either the local
or remote unit. The TM signal is affected by both V.54 loopbacks
and loopbacks that are initiated through the LCD or terminal menus.