Expand Configuration and Management Manual (G06.24+)

Expand Modifiers
Expand Configuration and Management Manual—523347-008
17-18
OSTIMEOUT n
multi-line paths may require all Expand line-handler processes to have more than the
default buffer size for storing OOS packets.
OSTIMEOUT n
Default: 300 (3 seconds)
Units: 0.01 seconds
Range: 10 through 32767 (0.1 seconds through 5:27.67 minutes)
This path modifier is applicable to all Expand line types. This modifier specifies the
amount of time, in one-hundredth of a second increments, that out-of-sequence (OOS)
packets are held before they are discarded. For example, an OSTIMEOUT modifier
value of 300 is equal to 3 seconds. In general, the OSTIMEOUT modifier value should
be greater than the L2TIMEOUT modifier value and less than the L4TIMEOUT modifier
value.
The OSTIMEOUT modifier must be set to the same value for every Expand line-
handler process on every node in the network. If congestion control is enabled for any
system in the network, an OSTIMEOUT modifier value of at least 3 seconds is
recommended.
PATHBLOCKBYTES n
Default: 0
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 multipacket frame. You should read the description of the
multipacket frame feature in Section 18, Subsystem Description, before using this
modifier.
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, the
PATHBLOCKBYTES modifier will be set to zero, the multipacket frame feature will be
permanently disabled, and an operator message will be logged.
If both the PATHBLOCKBYTES and PATHPACKETBYTES modifiers are enabled, the
PATHBLOCKBYTES modifier value must be greater than or equal to the
PATHPACKETBYTES modifier value. If the PATHBLOCKBYTES modifier value is less
Note. The OSSPACE modifier is currently ignored. The amount of space allocated to out-of-
sequence (OOS) packets is limited by the OSTIMEOUT modifier and by the base size of the
line handler’s data segment. The OSSPACE modifier may be used in the future, in which case
its default, units, and range may be different. For this reason, the recommended setting for
OSSPACE is to not specify it, but to let the default be used.