AT&T 3B2/300 Technical Reference Manual page 425

FUNCTIONAL D E S C R I P T I O N - - - - - - - - - - - - - - - - - - - - - - - - - - -
CM 195A Equipped Device Table Data
The following table shows the Equipped Device Table (EDT) data for a CMl 95A NI Card. A value
of O means NO; a value of 1 means YES. The indirect device (indir_dev) is only applicable to systems
equipped with Small Computer System Interface (SCSI). The request queue size (rq_size) and the
completion queue size (cq_size) are NI software defined values. As such, the rq_size and cq_size
values may differ between versions of NI software.
3BNET Characteristics
Coaxial Media Cable
EDT ITEM
IDENTIFICATION CODE (ID_code)
DEVICE NAME (dev_name)
REQUEST QUEUE SIZE (rq_size)
COMPLETION QUEUE SIZE (cq_size)
BOOT DEVICE (booLdev)
WORD SIZE (word_size)
BOARD SIZE (brd_size)
SMART BOARD (smrLbrd)
CONSOLE CAPABILITY (cons_cap)
CONSOLE FILE (cons_file)
INDIRECT DEVICE (indir_dev)
DATA
Ox 0002
NI
Ox OA
Ox 19
0
1
0
1
0
0
0
The maximum end-to-end length of the media cable without using repeaters is 500
meters. The data transmission rate over the media cable is 10 megabits per second.
Terminators The media cable is terminated at each end with SO-ohm resistors to prevent signal
reflection.
Transceivers Transceivers provide nodal tap into the media cable and provide electrical isolation
for transmitting and receiving signals. These units must be installed at designated
points on the media cable to maintain standing wave specifications. Transceivers
are powered by 12 volt DC supplied from the NI card via the drop cable.
Drop Cable
The drop cable interconnects the transceiver and the NI card. The maximum length
of this cable is 50 meters.
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