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MDR-2000
VJ
User's Reference Manual
Communications
4.3 Discrete Polling
Under normal circumstances the MDR-2000 collects call detail (CDR) data which is preprocessed
and optionally any non-CDR data which it stores in an unprocessed image format. When polled by
a host system the C
DR
and image data records are transmitted in the order they arrived from the
PBX. The host system can separate the two formats
of
data by testing the record type affixed by the
MDR-2000 when it processes the data records. This
is
done automatically by the downstream data
collection modules found in MDR products.
Certain users may find it necessary to collect CDR data at one site, or on one downstream machine,
and image data on another. For these applications descrete polling
of
CDR or image data has been
implemented in the MDR-2000. With the descrete polling commands it is possible for polling
modules on host computer systems to collect either CDR or image data and have other processes on
another host computer collect the remaining type
of
data.
The descrete polling commands are all covered under sections
of
this manual dealing with the
commands and details on them can be found there. The commands used in discrete polling are SET
DESCRETE COLLECTION FUNCTIONS found in the Interactive Monitor, and the computer-to-
computer commands; CL, CA, CI, CC,
OK
, DB and BE.
The process
of
discrete polling
is
implemented by the cooperative effects
of
the MDR-2000 and the
downstream polling module. Firstly, the MDR-2000 must have the descrete polling capability
enabled by using the SET DESCRETE COLLECTION FUNCTIONS command in the Interactive
Monitor. Then when polling is initiated the host collecting CDR data must issue the 'CC'
command before it begins collecting. This command indicates that the downstream facility only
wishes to receive the CDR data.
When the end
of
the data is reached the downstream facility must issue a 'CL' command to clear
the buffer. This has the effect
of
moving the MDR-2000's pointers back to their values before data
collection began and then advanced
to
the first image record. When the second downstream
process begins collecting it must issue a 'CI' command
to
indicate that it only requires the image
data.
It
is
noteworthy that the 'DB' command used to determine
if
an MDR-2000
is
active always issues
an automatic 'CA' command to effectively disable descrete collection. As well the 'OK' command
that
is
used to advance the MDR-2000's pointers to the next record for collection now skips over
any record
of
the wrong type, and flags the last transmitted record as deleted. This operation is
largely invisible to the user or programmer interfacing with the MDR-2000. Finally, it should be
noted that
if
descrete collection is in progress and only one type
of
record
is
being collected (say
4-7
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