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Configuring the Idle Cell Format

ATM devices send idle cells to enable the receiving ATM interface to recognize the start of each new cell. The receiving ATM device does not act on the contents of idle cells and does not pass them up to the ATM layer in the ATM protocol stack.

By default, the idle cell format for ATM cells is (4 bytes): 0x00000000. For ATM 2 PICs only, you can configure the format of the idle cell header and payload bytes.

To configure the idle cell header to use the International Telecommunications Union (ITU-T) standard of 0x00000001, include the itu-t statement at the [edit chassis fpc slot-number pic number idle-cell-format] hierarchy level:



[edit chassis fpc slot-number pic pic-number idle-cell-format]
itu-t;

On a TX Matrix platform, include the itu-t statement at the [edit chassis lcc number fpc slot-number pic pic-number idle-cell-format] hierarchy level:



[edit chassis lcc number fpc slot-number pic pic-number idle-cell-format]
itu-t;

By default, the payload pattern is cell payload (48 bytes). To configure the idle cell payload pattern, include the payload-pattern statement at the [edit chassis fpc slot-number pic number idle-cell-format] hierarchy level:



[edit chassis fpc slot-number pic pic-number idle-cell-format]
payload-pattern payload-pattern-byte;

On a TX Matrix platform, include the payload-pattern statement at the [edit chassis lcc number fpc slot-number pic pic-number idle-cell-format] hierarchy level:



[edit chassis lcc number fpc slot-number pic pic-number idle-cell-format]
payload-pattern payload-pattern-byte;

The payload pattern byte can range from 0x00 through 0xff.

For information about the TX Matrix platform, see TX Matrix Platform and T640 Routing Node Configuration Guidelines.

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