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IBM 1 Series - Page 75

IBM 1 Series
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Unit-Load
Equivalences
Unit-load
substitutions
may
be
made
on
the
I/O
channel
using
the
following
equivalence
definitions
and
rules.
The
I/O
channel
feature
sockets
in
the
processor
and
I/O
expansion
card
files
represent
an
available
resource
in
the
system.
A
unit
of
available
locations
is
a
subset
of
this
total
resource
for
planning
and
application
purposes.
A
unit
of
available
locations
is
defined
as
the
physical
group
of
sockets
available:
1.
Outboard
of
the
processor
and
up
to,
but not
including,
the
first
channel
repower
feature.
2.
Outboard
of
any
channel
repower
feature,
and
including
the
next
channel
repower
feature.
3.
Outboard
of
the
last
channel
repower
feature
installed
on
the
system.
Given
a
unit
of
available
locations
for
case
1,
the
total
connected
load
for
any
4955
processor
model
is:
[(No.
of
general
loads)
+2
(No.
of
TTL
unit
loads)
+
(channel
repower)|
<21
where:
(No.
of
TTL
unit
loads)
<8.
Given
a
unit
of
available
locations
for
case
1
for
all
models
of
4952
and
4953:
[(No.
of
general
loads)
+2
(No.
of
TTL
unit
loads)
+(channel
repower)]
<14
where:
(No.
of
TTL
unit
loads)
<6
All
versions
of the
4952
and
4953
processors
require
a
channel
repower
card
to
exit
the
card
file.
For
cases
2
and
3:
[(No.
of
general
loads)
+2
(No.
of
TTL
unit
loads)]
<14
where:
(No.
of
TTL
unit
loads
)
<7
Any
unit
of
available
locations
may
not
contain
more
than
one
cable,
which
must
be
less
than
1.8
meters
long.
A
special
case
of
a
unit-load
substitution
is
for
an
attachment
that
presents
a
TTL
unit
load
in
all
respects,
except
that
any
of
its
type
A-A,
A-B,
or
A-C
receiver
always
presents
an
active
receiver
load
(—1.6
mA
at
0.4
V).
This
type
of
load
is
called
a
TTL-selected
load.
A
maximum
of
one
TTL-selected
load
attachment
can
be
substituted
for
one
general
unit-load
attachment
in
any
unit
of
available
locations.
No
TTL
unit
loads
may
coexist
in
a
unit
of
available
locations
containing
a
TTL-selected
load.
2-64
GA34-0033

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