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ATM Operation
Setting Foreground Traffic
What is a test cell? Simultaneous measurement of all ATM performance parameters can be made using
a special-purpose test cell. The test cell is described in ITU 0.191. The cell payload
consists of a 4-byte sequence number (SN) which is used to detect lost or
misinserted cells, a 4-byte timestamp (TS) which is used for cell delay and CDV
measurements, a 1 byte test cell payload type (TCPT) and a 2-byte CRC-16 which is
used for error detection and protection of the sequence number and timestamp.
An example of the test cell is given below.
Test Cell
header
SN
TS
Unused
TCPT
CRC-16
5 bytes
4 bytes
4 bytes
37 bytes
1 byte
2 bytes
160
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