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OPERATION
The Maintenance
Screen
3-35
ILB Frame
This sets the Inband Loopback Code Framing option to UNFRAMED
(CSU transmits unframed inband loopback codes) or FRAMED (CSU
transmits framed inband loopback codes), when a DS1 Remote Test is
started. The default setting is UNFRAMED. (This option is also set via
option switch S5-7.) (In Unframed Mode, this function is always set to
UNFRAMED.)
Line Build-Out
This sets the Line Build-Out option for Line Build-Out on the network side
to AUTO (automatic Line Build-Out, based on the signal level received
from the network) or M A N (manually-set Line Build-Out), and one of the
following attenuation levels: 0 dB (no attenuation), 7.5 dB (7.5 dB atten-
uation), or 15 dB (15 dB attenuation). Selecting the proper signal level
ensures that the signal reaching the Central Office is satisfactory. The
default setting is M A N 0 dB. When the CSU is configured as a slave
CSU, this option cannot be changed via the Supervisory terminal. (This
option is also set via option switches S7-4, S7-5, and S7-6.)
Do not enable automatic Line Build-Out for both CSUs
when they are connected back-to-back.
Pre Equalizer
This sets the Pre-Equalization option for matching the equipment-side
line length, providing transmitter pre-equalization for lengths of 130 ft
(0-130 feet), 260 ft (130-260 feet), 390 ft (260-390 feet), 530 ft (390-530 feet),
or 655 ft (530-655 feet). The default setting is 130 ft. Selecting the proper
length ensures that the signal reaching the equipment is satisfactory.
When the CSU is configured as a slave CSU, this option cannot be
changed via the Supervisory terminal. (This option is also set via option
switches S7-1, S7-2, and S7-3.)
Update Defaults
This function to set all options to their factory default values (unless there
is a conflict with an option switch, in which case the switch setting pre-
vails). To use this function, press U. All options are set to their factory
default values, and these values are displayed. (When through updating,
the CSU displays the message Update Is Complete.) Set individual op-
tions, as required. When the CSU is configured as a slave CSU, this op-
tion cannot be changed via the Supervisory terminal.
The Supervisory terminal can be used to set the CSU date and time, to se-
lect a new CSU address, and to reset the CSU. Figure 3-18 illustrates the
functions available through the MAINTENANCE screen.
NOTE
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