
Media Processing Server System Operator’s Guide
Page 158 # P0602484 Ver: 2.7
Host Communication Troubleshooting
Since each application communicates directly with the host, problems that arise may
be logical (i.e., software or protocol related) rather than absolute (i.e., the physical
interface).
For additional information on working with applications, see the MPS Developer
User’s Guide. For additional host-specific issues, refer to the Media Processing
Server Series
COMMGR Reference Manual.
Host Communication Troubleshooting
Condition Cause Action
MPS is not
communicating with the
host
The host link is physically
disconnected.
Check all physical connections. Make sure they are
secure.
The host is down. Wait for the host to start up.
The host is up, but all terminals
(LUs) are down.
Bring up all appropriate host applications.
The protocol software is not
functioning properly.
Call for maintenance service.
Host went down and
came up but the MPS is
not responding
The application does not handle
the host-up condition properly.
Verify that the application properly handles host up/
down status messages.
Host error message
(COMMGR) occurred
during application run
time
The host is sending delayed
responses that the MPS is
discarding.
The MPS discards messages sent in 24-byte header
mode. This is normal.
The application code contains
incorrect host access commands.
Verify and correct the application host access
sequences.
There is not enough delay time
between the host send and host
receive calls.
Two send requests without an intervening receive
request causes an error.
Excessive missed polls
or retry sequences
The modem and clocking options
are not correct.
Synchronize the MPS and modem clocking options.
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