Switchback; Figure 5. Protect Operation; Figure 6. Switchover - ADTRAN 1xN Installation And Maintenance Manual

See Figure 5 and Figure 6 for switchover codes
and traffic results.

8. SWITCHBACK

Switchback operation is defined as the
re-establishment of the T1 transmission path between
the network and the customer using the regularly
assigned line. Communication between the COE and
RE will be based upon in-band or out-of-band (ESF
datalink) commands.
Switchback Receive Path
Remote
Switchback operation is accomplished by sending a
specific sequence of SF in-band patterns or ESF
datalink messages over the standby line.
CENTRAL OFFICE
DSX-1
< Live Traffic >
DCS
< Acknowledge
Switch Code >
TEST
CENTRAL OFFICE
DCS
< Live Traffic >
TEST
10
All manuals and user guides at all-guides.com
Office
Repeater
Bay
Office Repeater
or
HTU-C
T1 / HDSL / HDSL2
Office Repeater
or
HTU-C
WECO D4
WESCOM 3192
PROTECT OPERATION

Figure 5. Protect Operation

Office
Repeater
DSX-1 Bay
Office Repeater
or
HTU-C
Office Repeater
or
HTU-C
WECO D4
WESCOM 3192

Figure 6. Switchover

Section 61190860L1-5, Issue 2
Communication using in-band codes will override
the customer's data during the switchback
operation. The customer's data will be overridden
for 10 seconds. These remote provisioning
commands are transmitted to the controller card
from a remote test facility or a T1 test set at a DSX
panel.
Local
Depressing S2 on the SCIM card for a minimum 5
seconds resets the protect configuration in memory.
< Live Traffic >
Switch Codes >
T1 / HDSL / HDSL2
< Live Traffic >
SWITCHOVER
NOTE
CUSTOMER PREMISES
DTWA
NIU CIM
Main
CPE
Standby
CUSTOMER PREMISES
DTWA
NIU CIM
Main
CPE
Standby
61190860L1-5B