Expand Configuration and Management Manual (G06.24+)

Expand Modifiers
Expand Configuration and Management Manual—523347-008
17-19
PATHPACKETBYTES n
than the PATHPACKETBYTES modifier value, the PATHBLOCKBYTES modifier value
is automatically changed to the PATHPACKETBYTES modifier value.
A value of 0 (the default) specifies that the multipacket frame feature will be disabled.
A value of 0 is recommended for Expand-over-ATM lines.
PATHPACKETBYTES n
Default: 1024
Units: Bytes
Range: 0 or 1024 through 9180 for Expand-over-ATM and Expand-over-IP lines
0 or 1024 through 4095 for all other Expand line types
This path modifier is applicable to all Expand line types. This modifier specifies the
maximum size, in bytes, of a variable packet. You should read the description of the
variable packet size feature in Section 18, Subsystem Description, before using this
modifier.
The variable packet size feature cannot be used if the FRAMESIZE modifier is 517 or
more words. This feature does not provide any benefit on paths configured with the
L4EXTPACKETS_OFF modifier, which specifies that the extended 64-byte packet
header format not be used. Nonextended frames are not fragmentable and therefore
must use the network-wide FRAMESIZE modifier value.
The value of n must be larger than the result of the following equation:
n > framesize * 4
where framesize is the configured frame size, in words, as specified by the
FRAMESIZE modifier. If n is not greater than the result of this equation,
PATHPACKETBYTES will be set to zero, the variable packet size feature will be
permanently disabled, and an operator message will be logged.
To enable the PATHPACKETBYTES modifier, the setting must be greater than or equal
to 1024. If the PATHPACKETBYTES modifier was set to a value less than 1024, but
greater than 0, it is automatically changed to 1024.
If both the PATHBLOCKBYTES and PATHPACKETBYTES modifiers are enabled, the
PATHBLOCKBYTES modifier must be greater than or equal to the
PATHPACKETBYTES modifier value. If the PATHBLOCKBYTES modifier value is less
than the PATHPACKETBYTES modifier value, the PATHBLOCKBYTES modifier value
automatically changes to the PATHPACKETBYTES modifier value.
A value of 0 specifies that the variable packet size feature will be disabled.
A value of 9152 is recommended for Expand-over-ATM lines.