Line 2 Mb/S, Transparent (Unframed), No Re-Timing - Wavetek ANT-20 Operating Manual

ANT-20SE
3.4 Line 2 Mb/s, transparent (unframed), no re-timing, full test (approx. 25 min)
Commissioning a transparent 2 Mbit/s communications line
Use the "Line 2 Mb/s, transparent (unframed), no re-timing, full test (approx. 25 min)"
application if you intend to commission an unstructured 2 Mbit/s line. The term unstructured
means that the line can transport any unframed or framed 2 Mbit/s signals.
Special features
If the desired or required properties of the line to be tested are known (transparent or structured
lines), a check is first made to see if these properties are present. The in-depth measurements
(e.g. MTJ, G.826, jitter) are performed after this.
Connecting the item under test
The balanced or coaxial output and input sockets of the item under test are connected to input
[12] or [14] of the receiver (RX) and output [13] or [15] of the generator (TX) for the "Line 2 Mb/
s, transparent (unframed), no re-timing, full test (approx. 25 min)" application.
Measurement
All the relevant tests are performed using an unframed PRBS15 test pattern.
The following typical line parameters are expected:
Typical line parameter
Frames
CRC
Re-timing
Clock pulling range > ±50 ppm
Termination for FAS and CRC
CRC-4 / E bit detection
Table SA-4
The following measurements are then performed:
Test
Alarm sensor test LOS → AIS_2M
Signal delay < 22 ms "round trip"
Intrinsic jitter HP1 (10 Hz/100 kHz):
< 1.1 UI
Table SA-5
Standard Applications
Expected line type parameters
pp
Measurements performed
Explanation
No
Not applicable
No
All measurements are performed with the "ANT-20 TX clock from
RX" setting.
Not applicable
Not applicable
Explanation
The line must return an unframed all ones signal if no signal is
present at the input.
Corresponds to an "end-to-end" delay of 11 ms
Intrinsic jitter measured with HP1 (10 Hz high-pass filter)
ANT-20 NEXT
SA-11