Specifications

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CHAPTER 14: Viewing Status Information
Current DDS Network Status
This display line (see Figure 14-1) displays the status of the main telco line.
For normal operation this should display LOOP IS NORMAL; these are the
other possible messages:
Answering Call The CSU/DSU MS DBU detects an incoming
call.
Check Telco The transmit and receive (Tx/Rx) pairs of the
loop connection are reversed. The pairs should
be swapped for normal operation.
Going to DBU This message is displayed briefly while switching
from the dedicated service to dial-backup mode.
In Dial Backup The DSU is in dial-backup mode.
LL Test From Telco An LL test has been initiated from the telco.
Loop is Normal The DSU is connected to the dedicated line.
OOS/OOF The telco is transmitting an out-of-service code.
Open Loop The DDS physical connection has been broken.
Waiting for Call The DBU module is waiting for a call.
DTE C ONTROL L EADS AND S TATUS
Four additional DTE interface leads are displayed with their current status
(on or off) displayed below:
TR—Data Terminal Ready
SR—Data Set Ready
LLB—Local Loopback
RLB—Remote Loopback