TTC T-BERD 107A, Reference Manual

Page: 113 / 261

4-16
SECTION 4
AUXILIARY
FUNCTIONS
ESF PAYLOAD — Out-of-band payload loop
codes are transmitted in the ESF datalink. The
T-BERD 107A does not respond to an out-of-
band payload loop code. The loopback affects
only data bits; framing bits are not affected. The
out-of-band payload loop-up code is 1111 1111
0010 1000. The out-of-band payload loop-
down code is 1111 1111 0100 1100. If this
choice is selected when the mode is not an ESF
operating mode, the CSU IN BAND loop code
is transmitted instead.
When the LOOP CODES switch is in the NIU
position, the RESULTS switch is used to select one
of the following loop codes:
FAC1
—
The 4-bit facility or network (smart
jack) loop codes allow the T-BERD 107A to
establish a loopback with a compatible facility
interface or respond to a facility loop code. The
facility 1 (FAC1) loop-up code is 1100. The
facility 1 (FAC1) loop-down code is 1110.
FAC2
—
The 5-bit facility or network (smart
jack) loop codes allow the T-BERD 107A to
establish a loopback with a compatible facility
interface or respond to a facility loop code. The
facility 2 (FAC2) loop-up code is 11000. The
facility 2 (FAC2) loop-down code is 11100.
FAC3
—
These facility or network (smart jack)
loop codes allow the T-BERD 107A to establish
a loopback with a compatible facility interface
or respond to a facility loop code. The facility 3
(FAC3) loop-up code is 100000. The facility 3
(FAC3) loop-down code is 100.