JDS Uniphase CellAdvisor JD780A Series, User Manual

Page: 533 / 592

JD780A Series Analyzers
Using T1 Analyzer
533
–
Monitor : Provides 100-ohm nominal input impedance for the in-service monitoring of T1
lines.
3.
Toggle the Framing soft key between SF-D4 and ESF and select the framing type for your
receiver setting:
–
SF-D4 (Super Frame-D4): Group of 12 frames, used to align equipment for framing.
–
ESF (Extended Super Frame): Group of 24 frames, used to align equipment for framing.
4K for a maintenance channel (Facilities Data Link), 2K for CRC-6 checksum, and 2K for
framing/synchronization.
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 B8ZS and select the line code type to send an
T1 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.
–
B8ZS: It stands for Bipolar with 8-Zero Substitution. A coding scheme in which the
transmitter "substitutes" a fixed pattern of ones, zeros, and BPVs in place of 8 consecutive
zeros.
To start or stop testing:
1.
Press the MEASURE hot key.
2.
Press the RX Signal soft key, and then select the testing 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.
Measurement example
Figure 280 T1 RX signal testing