BELL SYSTEM PRACTICES
AT&TCo Standard SECTION 582-200-212
Issue 2,
January
1979
"DATASPEED"*
40
KEYBOARD-DISPLAY AMPLIFIER (KDA) FEATURE
CONTENTS PAGE
1.
GENERAL
.....................
1
2. DESCRIPTION
..................
1
TECHNICAL DATA
..............
3
3. INSTALLATION
................
4
4. OPERATIONAL TEST
............
17
5. TROUBLE ISOLATION
...........
17
6. DISASSEMBLY/REASSEMBLY
.....
23
7. PARTS
........................
23
NUMERICAL INDEX
.............
29
1.
GENERAL
1.01
This section provides general description,
installation information, testing, trouble
isolation procedures, disassembly/reassembly and
parts identification for
the
40KDA101 Keyboard-
Display Amplifier (Fig.
1).
1.02
This section
is
reissued,
to
add
C18
to
Fig.
10
and
specify TKS107 in place
of
31246RM.
Fig.
1-40KDA101
Keyboard-Display Amplifier
*Registered Trademark
of
AT&TCo.
Note: When ordering replaceable
components,
prefix each
part
number with
the
letters
"TP"
(ie, TP405372), unless specified otherwise.
1.03 Two types
of
KDA installations, (Fig.
2)
are described in this section:
(a) Free-standing units requiring a
405982
modification kit.
(b) KDA units
mounted
in a 40CAB251/AC
cabinet requiring a 405983 modification
kit.
Support
components for use
with
the
KDA in a DATASPEED
40/4
system are
also described.
2. DESCRIPTION
2.01 The KDA allows for
the
extension
of
a
KD
(Keyboard Display) device in an
already installed system
or
may be used
to
plan
new station layouts
with
a greater KD location
flexibility.
It
is only required when a KD is
to
be
more
than
100
feet away from its controller (up
to
600
feet). However
if
desired,
the
KDA can
also
be
used when a KD
is
less
than
100
feet
from a controller.
2.02
The
KDA may be used in maxi-cluster
station arrangements where
it
is
desired
to
place
the
Device Cluster Controllers (DCC) adja-
cent
to
the
Station
Cluster Controller (SCC)
to
more closely resemble
the
station arrangement
that
this station
is
replacing
and
thus
use similar
cable runs
to
the
devices. The use
of
the
KDA in
such a case allows
the
smaller diameter cable
to
be
used. Similarly, when
the
station includes a
Mini-Cluster Controller (MCC),
the
use
of
this
smaller diameter cable may be advantageous.
2.03 The keyboard-display amplifier accepts
the
low video and half-intensity signals
from
the
40C400
type
controller. These signals
are driven
into
an Emitter Coupled Logic (ECL)
line receiver
by
the
discrete differential ampli-
fiers.
The
outputs
are standard ECL differential
signals
of
1.6
volts.
Prepared for American Telephone and. Telegraph Company
by
Teletype Corporation
©1976
and
1979
by
Teletype Corporation
All rights reserved
Printed in U.S.A.
Pagel
