Installation guide

356 Installation Guide for Clients
If you don’t know the number of SAPs and stations your application
requires, and you want to minimize the memory usage of your
terminal emulation applications, start with large values and gradually
reduce them until the application no longer works.
The default is set to saps=3 and stations=20. This is more than
enough for most Microsoft DLC applications. Unused SAPs and
stations are harmless except that they consume memory.
swap
This parameter is only meaningful if Microsoft DLC is bound to an
Ethernet driver. It turns on address bit-swapping when
Microsoft DLC is bound to an Ethernet driver. If you are not sure
what value you need for this entry, please consult the system
administrator for the host system.
If you previously used the DXME0MOD.SYS driver successfully,
this is how to map its xmit_swap parameter to Microsoft’s DLC
swap and usedix parameters:
DXME0MOD.SYS
xmit_swap
Microsoft
DLC swap
Microsoft
DLC usedix
01
0
11
1
20
0
30
1
timers
Specifies the number of timers running at one time using the
Microsoft DLC timer primitives.
t1_tick_one
Sets the retransmission-timer “short tick” value in units of 40
milliseconds. This timer determines the delay before retransmitting a
link-level frame if no acknowledgment is received.
The Microsoft DLC protocol uses three timers: t1 (retransmission),
t2 (acknowledgment), and ti (inactivity). Each timer has a “short tick”
rate and a “long tick” rate that individual commands use in
determining timer values. A command such as dlc.open.sap specifies
a timer value with a number range of 1–10 units of milliseconds.
When the number is in the range of 1–5 units of milliseconds, the
actual timer value is: