Expand Configuration and Management Manual (H06.21+, J06.10+)

Expand Modifiers
Expand Configuration and Management Manual — 529522-013
16 - 7
COMPRESS_OFF/COMPRESS_ON
COMPRESS_OFF/COMPRESS_ON
Default: COMPRESS_ON
Units: Not applicable
Range: Not applicable
These path modifiers are applicable to all Exp
and line types. The COMPRESS_ON
modifier specifies that data compression will be performed. Data compression causes
multiple blanks, zeros, and nulls to be removed before data transmission. You can stop
data compression from being performed by using the COMPRESS_OFF modifier.
You can increase the net line throughput by using the COMPRESS_ON modifier
because compression causes the number of bytes transmitted to be reduced; however
,
if data being transmitted is not compressible and the COMPRESS_ON modifier is
used, throughput can actually be reduced (processor cycles are required to perform
compression).
To determine if data compression should be set, you should examine the message
traffic character composition to assess its compressibility. For example, EDIT files do
not compress well, while structured files and object code compress an average of 20 to
50 percent.
If compressed data is received by an Expand line-handler process that does not have
compression configured, the data will still be decompressed. Therefore, it is not
mandatory that the COMPRESS_ON modifier be configured at both ends of a line.
CONNECTTYPE_ACTIVEANDPASSIVE/
CONNECTTYPE_PASSIVE
Default: CONNECTTYPE_ACTIVEANDPASSIVE
Units: Not applicable
Range: ON or OFF
These modifiers are applicable to Expand-over-NAM, Exp
and-over-IP, Expand-over-
ATM, and Expand-over-ServerNet line-handler processes.
For Expand-over-NAM and Expand-over-ServerNet line-handler processes, the
CONNECTTYPE_ACTIVEANDP
ASSIVE modifier indicates to the network access
method (NAM) that it should first issue call requests and then, if the requests are
unsuccessful, then wait for an incoming call request.
For Expand-over-IP and Expand-over-A
TM line-handler processes, the
CONNECTTYPE_ACTIVEANDPASSIVE modifier indicates that the Expand-over-IP or
Expand-over-ATM line-handler process sends a Connect request; if the Connect
request is unsuccessful, then the Expand-over-IP or Expand-over-ATM line-handler
process waits for an incoming Connect request.
For Expand-over-NAM and Expand-over-ServerNet line-handler processes, the
CONNE
CTTYPE_PASSIVE modifier causes the network access method (NAM) to wait
for incoming connect requests; the NAM will not initiate connect requests.