Installation manual

Function 2: CO lines IVX 128
E.6
Function 2123: Line build-out
This function allows you to adjust the line build-out of the DLC12 card. The level programmed de-
pends on the application (CSU or DSX-1) indicated in the following table.
Level CSU line build-out DSX-1 line build-out
1
0 dB 0 to 133 feet
2
N/A 133 to 266 feet
3
N/A 266 to 399 feet
4
N/A 399 to 533 feet
5
N/A 533 to 655 feet
6
-7.5 dB N/A
7
-15 dB N/A
8
-22.5 dB N/A
Use the scroll keys to select the line build-out and press
#
to confirm. Default is
1
.
If a second DLC12 card is installed, the system will alternate to the next port card. Select the line
build out with the scroll key. Press
#
to confirm.
Function 2124: CSU emulation
Use the scroll keys to toggle between enabled and disabled.
Default:
Off. If there is no external
CSU, the CSU emulation setting should be set to
On
but the remaining options should be left at the
default setting of
Off
. When CSU emulation is enabled, the following test options will be available
and
should be used only at the request of the carrier
.
Test option* Description Options Default
ATT PRF Loopback test per AT&T spec 62411 for performance assessments,
sent to the carrier on ESF trunks only.
On/Off Off
ANSI PRM Loopback test per ANSI spec T1.403 for performance assessments,
sent to the carrier on ESF trunks only.
On/Off Off
PLB (Payload loopback.) Accepts signal from the carrier at the chip level,
puts it through the framer (de-frames and re-frames signal with data
staying the same) and sends it back to the carrier. Used to determine
whether the chip itself is functioning correctly.
On/Off Off
LLB (Line loopback.) Sends the signal back right at the point it enters the
chip before it enters the framer. Helps determine whether the line
itself is good.
On/Off Off
NET LLB (Network loopback.) Lets the carrier put the DLC’s CSU into any of the
loopback modes.
On/Off Off
* Test options available only when CSU emulation is set to On.
Warning:
The default setting is
Off
for those systems using an external CSU. If there is no
external CSU, the CSU Emulation setting should be set to
On
but
the remaining
options should be left at the default of
Off
.
Use these other settings ONLY at the
request of your carrier or the phone system manufacturer for testing purposes.