Verilink DIU 2130 (880-503297-001) Product Manual - Manual (Page 56)

T1 Dial Backup Option Overview
5-8 Verilink
Configuring Modes for Dial Backup
The AM2000 display for configuring the T1 Dial Backup Option
operation is shown in Figure 6.
Figure 6 Configuration Screen for Dial Backup Mode
The Port 1 Backup/Restore Mode line selection allows you to
select dial backup mode. (Port 2 is always the backup port.)
Pressing F8 steps through the available modes as follows:
AUTOMATIC/AUTOMATIC
Port 1 is connected to port 2 upon one of the following
conditions:
1) Abnormal Station Code (ASC) is detected
within the channel data.
2) Loss of Frame (LOF) occurs on the T1 Signal.
3) The handshake lead Carrier Detect (CD) on the
Port 2 interface goes high.
Once the failed condition clears, port 1 drops the backup
line and resume normal operation over the T1 line.
AUTOMATIC/MANUAL
Similar to AUTOMATIC/AUTOMATIC mode. Port 1
connects to port 2 upon any of the above conditions.
However, it does not switch back when the condition clears.
You must switch it back manually from the online Test
Activity menu by selecting the Deactivate backup
connection menu option. (See Figure 5-2.)
/ DBU