Cable, CompactFlash and Accessory Specifications
A-16
Termination Shunt for the ISDN BRI-S/T NIM Card
ISDN
BRI
‐
S/T
terminal
equipment
devices
may
be
connected
at
random
points
of
the
cable
in
point
‐
to
‐
point
or
point
‐
to
‐
multipoint
configurations.
Line
termination
resistors
must
be
provided
at
both
ends
of
the
transmit/receive
lines
only.
The
XSR’s
BRI
NIM
card
provides
an
option
to
terminate
receive
as
well
as
transmit
lines
using
100
Ohm
resistors.
Shunts
are
required
to
shorten
the
appropriate
contacts
of
the
terminal
headers
(P1,
P2).
Refer
to
“Installing
Shunt/Terminal
Strip”
on
page
‐
16
for
directions.
Figure A
‐
20
shows
per
port
respective
termination
header
locations
and
the
orientation
of
the
receive
and
transmit
pairs.
Refer
to
Chapter
2
for
directions
on
accessing
the
BRI
card
on
the
XSR.
Installing Shunt/Terminal Strip
To
install
the
shunt
or
terminal
strip,
attach
two
dual
‐
pin
units
vertically
to
P1
and
P2
four
‐
pin
jumpers
corresponding
to
the
RJ
‐
45
port
using
a
balun,
as
shown
in
Figure A
‐
20
.
Any
other
RJ
‐
45
ports
on
the
NIM
card
connected
to
120
‐
ohm
lines
do
not
require
shunts.
Figure A-20 Installing a Termination Shunt on ISDN BRI-S/T NIM Card
Caution:
The cable connecting the BRI NIM to the balun requires two additional wires to extend
the chassis ground to the balun. Cables of this type are often provided by your supplier who can
customize them for your needs.
P2
P1
T1
T2
F1
4
F1
6
CR
1
F1
7
J1
J2
R eceive Pair Term ination
Transm it Pair Term ination
Port 0
Port 1
CR
2
R1
32
R1
33
F1
5
F1 F2
F3 F4
F5 F6
F7 F8
