The following files are provided with the Kernel
rate example file
for device I/O Control
Duplex Receive File example C code
Duplex Receive File example program
Duplex Send File example C code
Duplex Send File example program
Duplex Example program
Driver Statistics from I/O Control call
file using Registry Keys
The Kernel Driver is a Microsoft Character Device Driver.
It is a very efficient code implementation, using minimum
of the host processor resources. No transmission protocol
is used although data is packaged into HDLC type frames that
are of user defined size. Any errors which may occur in the
data transmission connection between the two systems are not
recovered but, the number of CRC errors may be monitored if
needed. If the communications link is of very high quality
and if the occasional error can be tolerated in the data,
then the Kernel Driver may also be used for data transmission.
The Kernel Driver now supports multiple channels, which
is sometimes referred to as bonded channels. A T1/WAN Master
is a two-channel device. In some cases it may be desirable
to increase the speed of a link by using two pipes. For example,
two T1 channels each running at 1.5M bits/sec may be used
to transmit data at the combined rate of 3M bits/sec. as if
there was one big pipe. The driver performs the multiplexing/de-multiplexing
automatically so that the data leaves in the same order as
This function of the Kernel Driver can be used with multiple
cards. For example, three WAN Master cards with six IM-T1-CSU
modules installed can give a maximum throughput of 6M bits/sec.
This data rate is fast enough for MPEG 2 Full D1 resolution,
which gives broadcast quality video. Of course the mux is
not restricted to MPEG applications.
DESCRIPTION OF dtest.exe
A program called DTEST is supplied as a test program.
DTEST is used most often to verify that a WAN/T1 Master communications
card is operating correctly. A "shorting plug" is used to
connect the transmit to receive data and clock for a single
board test set-up. It can also be used to test two systems
connected back-to-back with a null modem cable. An install.txt
file is supplied on the distribution disk which describes
the installation and use of this program. It also describes
the pin connections for a shorting plug and null modem cable.
The MTEST program is supplied with C source code and shows
how to transmit and receive data using the Kernel Stream driver.
It shows the OEM developer an example interface and can be
used to build custom applications. Minimum of one board with
a test plug is needed or it can also be used with two boards
connected back to back.
msend.exe AND mreceive.exe
These programs demonstrate how to use the Kernel Driver
to transmit and receive in a half duplex mode. Because it
is half-duplex there is a separate send side and a receive
side program. Together they demonstrate a software interface
to the Kernel Stream driver which can be used as a starting
point for OEM application software. Source code is supplied.
Two systems are needed in order to properly test the
drivers; a transmit computer and a receive computer, connected
back to back with a null modem cable. Each computer must have
a WAN/T1 Master installed. The transmit and receiving computers
can use one of a range of available interface modules. The
two computers must be connected using the proper null modem
cable. Null modem cables are available for all of the modules
listed in the following table.
or RS-449 or RS422 Interface
Speed Serial Interface (HSSI)
The Kernel Driver can be used to transmit information
from point to point or point to multi-point. It can also be
used in both full duplex and half duplex applications. A satellite
modem example is shown below.
that the Forge/Fusion can be substituted if higher quality
video is needed. Data rates up to 13.5 Mbits/sec are possible
using the IM530/449-DTE-100 module.