Line 34 Mb/S, Unknown Structure - Wavetek ANT-20 Operating Manual

ANT-20SE
4.2

Line 34 Mb/s, unknown structure

Analysis of a 34 Mbit/s line with unknown properties
Fig. SA-4
Special features
If the properties of the line are unknown, a measurement to determine the type of line present
is performed first. After this, measurements that apply to the type of line detected will be
performed.
A "Pass/Fail" assessment will not be made from the properties that are detected, since the
nominal line type is unknown.
Connecting the item under test
The balanced or 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, unknown
structure" application.
Measurement
The application initially starts a measurement to typify the line. The following properties of the
line are investigated:
• Is the line also suitable for unframed signals (transparent)?
• Is the line only suitable for framed signals (structured)?
• Is there a loop back for the payload data at the far end of the line (continuity)?
• Is the line terminated for FAS?
After this, measurements that apply to the type of line detected will be performed:
• Do the alarm and error sensors work properly?
• Is the frequency of the incoming signal (when there is no RX signal) within ±2 ppm of the
nominal clock frequency (AIS frequency)?
• Are the intrinsic jitter and tolerance to jitter within the limit values?
• Does a clock-transparent line also operate properly at the limits of the clock pulling range?
• Are any errors detected during a G.826 / M.2100 analysis (long term measurement)?
Standard Applications
Analysis of a 34 Mbit/s line with unknown properties
ANT-20 NEXT
SA-15