Line 34 Mb/S, Transparent (Unframed) - Wavetek ANT-20 Operating Manual

ANT-20SE
4.3 Line 34 Mb/s, transparent (unframed), full test (approx. 25 min)
Commissioning a transparent 34 Mbit/s communications line
Use the "Line 34 Mb/s, transparent (unframed), full test (approx. 25 min)" application if you want
to commission a transparent 34 Mbit/s line.
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 coaxial output and input sockets of the item under test are connected to input [14] of the
receiver (RX) and output [15] of the generator (TX) for the "Line 34 Mb/s, transparent
(unframed), full test (approx. 25 min)" application.
Measurement
The following typical line parameters are expected:
Typical line parameter
Frames
Table SA-6
The following measurements are then performed:
Test
Alarm sensor test LOS → AIS
Signal delay < 22 ms "round trip"
Intrinsic jitter HP1 (10 Hz/100 kHz):
< 1.1 UI
Intrinsic jitter HP2 (18 kHz/100 kHz):
< 0.2 UI
MTJ
M.2100/G.826
Table SA-7
Standard Applications
Expected line type parameters
pp
pp
Measurements performed
Explanation
no
Explanation
The line must return an 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)
Intrinsic jitter measured with HP2 (18 kHz high-pass filter)
The requirements of ITU-T G.823 must be met.
No errors may occur for measurement times of up to 24 hours.
Test signal: PCM31CRC with PRBS15
A G.826 "Out of Service" analysis is performed (default gate time:
15 min).
ANT-20 NEXT
SA-17