6100 ADCCP Programming Manual

Station and Data Capacity on Links
ADCCP Link and Station Management
2–18 069225 Tandem Computers Incorporated
Note The total amount of memory available on the LIU varies depending on the LIM type and the release level
of microcode.
If you are having problems with memory allocation, you can make the following
adjustments in your configuration or your application:
1. Modify the application so smaller frames are exchanged between stations and
change the MAXFRAMES parameter accordingly. (If a device requires a large
frame size, this change might not be feasible.) However, changing the frame size
must be coordinated with other stations on the link. If the frame size is too small,
the station may be disconnected when it receives a large frame.
2 Do not run a trace on a fully loaded line. If you are running a trace to debug a
problem, you have probably stopped important applications.
3. Change the WINDOW parameter to provide for fewer outstanding frames per
station. (If the application requires a very large window size, use fewer stations
per line.)
4. Modify DEFINELIST requests to include fewer stations. (This will have only a
small impact on performance.)
5. Reduce the traffic on the link. The ADCCP protocol module dynamically allocates
the majority of its buffer space as applications make SENDTEXT requests or as
frames arrive on the line. To reduce traffic, an application can put some stations
into an RNR condition, or a system manager can use CMI to suspend some
stations temporarily. If you cannot disable stations, consider moving some
stations to another line.