Table 3-1. Front Panel Led Descriptions - ADTRAN DSU IV ESP User Manual

LED
RS: Request to Send
CS: Clear to Send
TD: Transmit Data
RD: Receive Data
CD: Carrier Detect
ALM: Alarm Indication
TST: Test Mode
61204011L1-1

Table 3-1. Front Panel LED Descriptions

Reflects the status of the request to send pin of the
DTE interface.
Reflects the status of the clear to send pin of the DTE
interface.
This LED is active when data is transmitted from the
DTE.
This LED is active when data is received from the net-
work.
This LED is active when frame synchronization is
achieved and the DSU IV ESP is ready to transfer data.
This LED activates whenever an alarm condition exists.
Alarm conditions include:
Open loop on network
No frame synchronization
Unit in dial backup
Problem on dial backup line
This LED is on whenever the unit is in test mode.
DSU IV ESP User Manual
Chapter 3. Operation
Description
3-7