Testing ATM Networks
Quality of Service Tests
6
6-47
Cell Loss Test
The Cell Loss test is used to test an ATM switch for the loss of cells. In a typical
Cell Loss test, a burst of cells is transmitted on TRANSMIT STREAM 1 for a
specified length of time. After the burst transmission, the OC3port Plus counts the
number of cells received on RECEIVE FILTER 1 (within a time period specified
by the user as "round-trip delay").
If the count of received cells on RECEIVE FILTER 1 matches the count of
transmitted cells from TRANSMIT STREAM 1, no cell loss occurred. If, on the
other hand, no match occurs (cells are missing), the cell loss ratio (number of cells
loss/number of cells transmitted) is calculated and stored in memory. The cycle of
transmission and detection is repeated continuously until the user stops the test by
selecting another OC3port Plus operation.
This section shows you how to set up and run a Cell Loss test.
Setting Up a Cell Loss Test
To set up a Cell Loss test, complete the following steps:
1. Press the
ATM
key. The
ATM SELECTIONS
menu is displayed.
2.
Press the
Down Arrow
key to move the
Setup RX Filtrs
option to the selection
line. Press
ENTER
to display the setup menu for
RECEIVE FILTER 1
:
RECEIVE FILTER: 1
or for Change
NAME:FILTER_1_
LOAD TX HDR TX1
za012f.eps
3. Set up RECEIVE FILTER 1’s parameters. (See "Configuring a Receive Filter"
in Chapter 5 for details.)
Note
RECEIVE FILTER 1 must be configured to match the cell stream
that is being checked for cell loss or mis-insertion.
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