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Selecting Test Features
Selecting ATM Cell Stream Payload
Selecting ATM Cell Stream Payload
Description The test stream comprises: 1 Foreground (F/G) Channel, 3 Background
(B/G) Channels and the remaining cell opportunities which are filled
with unassigned or idle cells.
HOW TO: 1 Select the payload which will be the subject of the test, the foreground
payload, in F/G PAYLOAD
For Delay measurements and Cell Misinsertion and Loss measurements
you need to select .
The PRBS runs continuously from cell to cell. With the
cross cell PRBS, cell misinsertion or cell loss will cause pattern sync loss.
With PRBS, the PRBS is restarted in every cell. Cell loss
will NOT cause pattern sync loss but, of course, payload errors will be
counted.
The selection allows you to select your own fixed byte in the
foreground.
2 Select a background stream B/G STREAM 1,2 or 3
3 Select the byte to be used as a payload in the selected background
(B/G PAYLOAD).
4 Repeat the procedure for the other B/G STREAMS.
5 Select the remaining content of the cell stream FILL CELLS or
.
TEST CELL
CROSS CELL
SINGLE CELL
USER BYTE
IDLE
UNASSIGNED
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