4-3
© Sage Instruments 2000
9100-2930-02 01/31/00
Sage Instruments 930i Communications Test Set
PCM
Operation
To select the external clock:
1. Press K3 under
EXT CLK
in the main PCM display (when in TERMINATE mode only). The
CLOCK
display reads:
CLOCK: LOOP-TIME INTERNAL
K1
K2
K3
K4
In
TERMINATE
mode, it is assumed that the E1 span you are terminating has been taken out of service
for test purposes. With the other three modes it is assumed that live traffic may be on the span.
2. Press K2 under
LOOP-TIME
OR K4 under
INTERNAL
for a clock source.
4-1.4 Setup
To change the default setups or the setup you have previously entered:
1. Press K4 under
SET-UP
from the main PCM display. The
SPAN
display reads:
IMPEDANCE: 120/75 OHM >1K OHM
K1
K2
K3
K4
The cursor appears above the current selection.
2. Use the
120/75 OHM
default at the Jack Field or at the CSU or Office Repeater jacks. Use
>1K
OHM
only in cases where your Jack Field does not supply isolation resistors.
If you leave the 930i in the >1K OHM position and connect it to the Jack Field monitor jacks (which
already have 1000 Ohms of isolation), the signal will be distorted and cause error indications
.
The display reads:
LINE CODING: AMI AUTO HDB3
K1
K2
K3
K4
3. Press K2 or K4 to select a line coding type, and press K3 to toggle
AUTO
on and off. Pressing
K2 or K4 will advance you to the following display:
FRAMING: CRC4 PCM30 PCM31 AUTO
K1
K2
K3
K4
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Содержание 930i
Страница 11: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 19: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 43: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 203: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 235: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...