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Installation
Prime Proprietary
2.8.10.9.2 ICS2 Buffer Board Configuration
The ICS2 buffer board, which is located in
the
ICS2
card
caye,
is
available in two configurations:
e
Terminated (ESA5238-901)
@
Nonterminated (&SA5238-902)
A terminated buffer board has two cable terminating resistor
dips
at
board
locations
O9A and 11A.
The nonterminated board has nothing at
these dip locations.
A terminated buffer board must be used if it
is
the only, or the last, buffer board connected to a controller board to
buffer board cable.
2.8.10.9.3 ICS2 LAC Bus Backplane Configuration
Each
Line Adapter Card (LAC) bus backplane supports one power supply,
one buffer board and from one to eight LACs.
Looking at the backplane
from the front of the card cage, the power supply
is
always
plugged
into
the left-nost slot.
Moving to the right, the buffer board is in
the next slot.
The remaining eight slots are for LAC cards.
There are two possible ways
in
which
the
LAC
bus
backplanes
ar
configured
in
manufacturing.
The first configuration has no jumpers
on the backplane.
This configuration sets the slot addresses
of
the
eight
LAC slots to $0 through $7.
The other configuration vequires a
jumper wire on the buffer board slot of the backplane
connecting
pin
CA-07
with pin CA-44.
Providing this jumper wire causes the 'FIRST-'
signal on the backplane to be hard-wired to a high state.
Without the
jumper, the 'FIRST-' signal will be hard-wired to a low
state.
With
this
configuration, the slot addresses of the eight LAC slots will be
set to $8 to SF.
Whenever
two
LAC
bus'
backplanes
are
connected
together
using
the
double
cable
(CBL6267-901),
their
LAC
slot
addresses must be different.
That is, one
backplane
must
have'
the
jumper
present
and
the other must not.
The two versions of the LAC
bus backplane are presented in Table 2-31.
TABLE 2-32: LAC BUS BACKPLANES
LAC BUS
BACKPLANE #
ADDRESSING
ESA49 39-901
Slots $0 —- $7 (no jumper wire)
ESA4939-902
Slots $8 - SF (jumper wire required)
2.8.10.9.4 ICS2 LAC Bus Power Supply Configuration
The LAC bus power supply, which is located in the ICS2 card cage,
has
no configuration options.
It is available in only one version.
070-C
2-
66
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