JDS Uniphase CellAdvisor JD780A Series, User Manual

Page: 521 / 592

JD780A Series Analyzers
Using E1 Analyzer
521
Monitoring transmission
Making a test
Procedure
To select the measurement mode:
1.
Press the MODE hard key.
2.
Press the E1/T1 Analyzer soft key.
3.
Select E1 Analyzer > Monitoring .
To configure measurement parameters:
1.
Press the MEASURE SETUP hot key.
2.
Press the RX Mode soft key, and then select the receiver input option from the following choices:
–
Terminate : Provides 120-ohm nominal input impedance, according to the framing and line
code settings.
–
Bridge : Provides input impedance greater than one kilohm for in-service monitoring,
bridging the receiver input across lines that are terminated elsewhere in the network.
–
Monitor : Provides 120-ohm nominal input impedance for the in-service monitoring of E1
lines.
3.
Toggle the Framing soft key between PCM30 and PCM31 and select the framing type for your
receiver setting:
–
PCM30 : Timeslots from 1 to 15 correspond to channels from 1 to 15 and timeslots from 17
to 31 to channels from 16 to 30. Timeslot 16 is for the multi-frame alignment and Channel
Associated Signaling (CAS).
–
PCM31 : Timeslots from 1 to 31 correspond to channels from 1 to 31.
NOTE
If the framing type does not match with your receiver setting, a framing alarm occurs.
4.
Toggle the Line Code soft key between AMI and HDB3 and select the line code type to send an
E1 signal:
–
AMI: It stands for Alternate Mark Inversion. A line code uses one three level signal to
convey binary digits in which successive binary ones (
“marks” or pulses) are of alternating
polarity, either positive or negative, equal in amplitude. A binary zero
(“space”) is
transmitted as no pulse or zero amplitude.
–
HDB3: It stands for High Density Bipolar order 3 encoding. It is a bipolar signaling
technique (using both positive and negative pulses) based on the AMI. It extends AMI by
inserting violation codes whenever there is a run of four or more zeros.
To start or stop monitoring:
1.
Press the MEASURE hot key.
2.
Press the Monitoring soft key, and then select the monitoring option as needed: Start , Stop , or
Clear .
Optional . You can save event records automatically by using the Save Logging Data soft key. See
“Using save” on page 31 for more information.