ADTRAN 1xN - Manual (Page 10)

10 61190860L1-5B Section 61190860L1-5, Issue 2
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.
Figure 5. Protect Operation
Figure 6. Switchover
NOTE
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.
DSX-1
DCS
TEST
T1 / HDSL / HDSL2
Office
Repeater
Bay
Office Repeater
or
HTU-C
< Live Traffic > < Live Traffic >
Switch Codes >
Main
Standby
Switch Code >
< Acknowledge
WECO D4
WESCOM 3192
CENTRAL OFFICE CUSTOMER PREMISES
PROTECT OPERATION
Office Repeater
or
HTU-C
NIU
DTWA
CIM
CPE
DSX-1
DCS
TEST
T1 / HDSL / HDSL2
Office
Repeater
Bay
Office Repeater
or
HTU-C
< Live Traffic > < Live Traffic >
Main
Standby
WECO D4
WESCOM 3192
CENTRAL OFFICE CUSTOMER PREMISES
SWITCHOVER
Office Repeater
or
HTU-C
NIU
DTWA
CIM
CPE