TTC T-BERD 107A, Справочное руководство

Страница: 69 / 261

SECTION 3
3-30
INSTRUMENT
DESCRIPTION
Figure 3-6
Troubleshooting Controls and Indicators
ERR
INS
B8ZS
BRIDGE
TERM
DSX MON
-7.5
-15.0
-22.5
0
LBO
LOOP
DOWN
CSU
NIU
PROG
RCVD
PRE-EXISTING LOOP
RX
INPUT
LOOP
CODES
LOOP
UP
23
21
20
22
24
LOOP CODES Switch
20
This switch selects the type of loop code transmitted
and responded to by the T-BERD 107A: CSU, NIU,
or PROG. The T-BERD 107A can transmit loop-up
and loop-down codes (
LOOP UP and LOOP DOWN
switches) to devices that can respond to in-band loop
codes or out-of-band (ESF datalink) loop codes.
These loop codes enable the T-BERD 107A to
establish an out-of-service loopback anywhere along
the span. Loop codes can be sent framed or unframed.
The following auxiliary functions are used in con-
junction with the
LOOP CODES switch to determine
the loop codes that are transmitted and responded to
by the T-BERD 107A (see Section 4 Auxiliary
Functions):
AUX PGM LPUP — Programs the program-
mable loop-up code.
AUX PGM LPDN — Programs the program-
mable loop-down code.