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BELL
SYSTEM
PRACTICES
AT
&
TCo
Standard
DIGITAL TRANSMISSION SYSTEMS
T1 DIGITAL
LINE
SECTION
365-222-200
Issue
6,
July
1977
INSTALLATION
AND
REPLACEMENT
OF OFFICE
REPEATERS
The purpose of
this
section is
to
provide procedures for installation
and
replacement of office repeaters
in
the
office repeater bays
(201
ORB,
206
ORB,
and T1C/T1 ORB).
This section is reissued to include
the
231-
and
236-type repeaters and to revise Table A. Changes
are
indicated by arrows. This reissue does not affect
the
Equipment Test List.
Table A is a summary of the office and bridging repeaters
and
features applicable to each repeater.
The EXCP and some bridging repeaters
must
be used
with
a DSX-1. All others (except bridging)
may be used with or without a
DSX
-1.
•The intermixing of low power
(60
rnA)
and
standard
power
(140
rnA) repeaters will cause maintenance
and
service problems. Therefore,
it
is recommended
that
these repeaters never be
intermi~ed
in
the
same span line,
apparatus
case,
or
office repeater shelf pair. Also
the
intermixing of integrated
and
nonintegrated circuit repeaters will cause maintenance problems
.•
Procedures
are
provided in this section for testing bridging repeaters
after
installation
or
replacement.
All
other
office repeaters are tested as a
part
of
the
digital line.
Note:
T1
digital lines must have a bipolar signal capplied to prevent oscillation in
the
event
that
they
are
equipped with nonintegrated circuit-type repeaters.
The following
tasks
are contained in
this
section:
TASK
PAGE
A-Installation
of
201B
or
201E Repeater
in
a
201
ORB
. 2
B-Replacement
of
201B
or
201E Repeater in a
201
ORB
3
C-Installation
of
201K
Repeater in a
201
ORB
4
D-Replacement
of a Repeater in a
201
ORB
With a 201K Repeater 4
E-Installation
of a
208D
•or
208AB• Repeater in a
201
ORB
4
F-Replacement
of a Repeater in a
201
ORB
With a
208D
•or
208AB• Repeater
5
G-Installation
and Testing of 201-Type Bridging Repeater
NOTICE
Not for use or disclosure outside
the
Bell System except under written agreement
Printed in U.S.A.
5
Page 1
SECTION
365-222-200
TASK
H-Installation
of 206-Type Office Repeater
I-
Replacement of
206-
Type Office Repeater
J-Installation
and Testing of 206-Type Bridging Repeater
K-Installation
of 221-Type Office Repeater
L-Replacement
of 221-Type Office Repeater
M-Installation
and Testing of 221-Type Bridging Repeater
N-•Installation
of 231-Type Office Repeater
0-Replacement
of 231-Type Office Repeater
P-Installation
and Testing of 231-Type Bridging Repeater
Q-Installation
of 236-Type Office Repeater
R-Replacement
of 236-Type Office Repeater
S-Installation
and Testing of 236-Type Bridging Repeater•
APPARATUS:
•Note:
The following apparatus is required for testing bridging repeaters only
.•
2-P3BH
Cords
1-380B
Plug (135-ohm termination)
1-J98725AD Fault-Locating Test Set
(25AD
FLTS) or J98710F
Fault
Locating Set (10F
FLS)
1-J98725AC Office Bipolar Violation Detector
(OBVD)
or J98710G
Error
Detecting
Set
(EDS)
STEP
PROCEDURE
A. Installation of
2018
or
201E Repeater
in
a 201
ORB
PAGE
7
8
9
11
11
11
13
13
14
15
16
17
1 Select a
201B
or 201E repeater and provide for the loop power option by tightening
the
L screws and removing the T screws.
Page 2
ISS
6,
SECTION
365-222-200
STEP
PROCEDURE
2
Insert
the
proper 836-type
LBO
networks in side 1
and
side 2 of the
repeater
as
required
by
the
span line record card. Securely tighten
the
screws in each network to provide a
good electrical connection.
Note:
If
repeaters
are
checked for continuity,
it
must
be done
after
the
power option
is provided
and
the 836-type networks
are
in place
as
outlined in Section 365-221-500.
3
Insert
the repeater into
the
repeater opening of the proper position in the
span
terminating
assembly (STA) as determined from
the
span line record card.
B.
Replacement of 201B
or
201E Repeater
in
a 201
ORB
Caution: To
prevent
interruption
of
service
when
performing
this
task,
service
must
be
patched
off
per
Section
865-226-500.
1 Turn down power on
the
faulty repeater (see Fig. 1).
Note:
Power for
the
office repeaters
in
a
201
ORB
can be
turned
down in only two
ways, depending upon how
the
repeater is powered.
(a) Powered Separately: To
turn
down power, remove
the
office
repeater
OFF
REP
fuse from the control
unit
located directly below
the
faulty repeater.
(b) Powered in Series With Line:
To
turn
down power, remove
the
two upper fuses
associated with line 1 from the control
unit
directly below
the
faulty repeater.
Caution:
Removal
of
the
fuses
from
the
wrong
control
unit
will
interrupt
service
on
one
or
more
working
lines
associated
with
other
Tl
digital
lines.
2 Remove
the
faulty repeater from the STA.
3 Select a new
201B
or
201E repeater; provide L power option by
tightening
the
L screws
and removing
the
T screws.
4 Remove the 836-type
LBO
network from side 1 of
the
faulty
repeater
and
insert
it
into
side 1 of the replacement repeater. Similarly,
insert
the
836-type network
in
side 2 of
the replacement repeater. Securely tighten
the
screws on each network to provide a good
electrical connection.
5 Verify the 836-type network assignments with
the
span line record card before
the
repeater
is placed in the STA.
Note:
If
repeaters
are
checked for continuity,
it
must
be done
after
the
power option
is provided and the 836-type networks
are
in place
as
outlined in Section 365-221-500.
6
Insert
the
replacement repeater into the proper position in the STA.
7 Restore power on the line by replacing
the
proper fuses removed in Step
1.
Page 3
SECTION
365-222-200
STEP
PROCEDURE
8 Notify the office
at
the other end of
the
span
that
the
repeater has been replaced and
the
line is ready for test.
C.
Installation
of
201K Repeater in a 201
ORB
1 Select a
201K
repeater.
2 Insert the
201K
repeater into the repeater opening of the proper position in
the
STA as
determined from
the
span line record card.
D.
Replacement of a Repeater in a 201
ORB
With a 201K Repeater
Caution: To
prevent
interruption
of
service
when
performing
this
task,
service
must
be
patched
off
per
Section
365-226-500.
1 Turn down power on the faulty repeater (see Fig.
1).
Note:
Power for
the
office repeaters in a
201
ORB
can be turned down in two ways,
depending upon how the repeater is powered.
(a) Powered Separately:
To
turn
down power, remove
the
office repeater OFF REP
fuse from the control unit located directly below the faulty repeater.
(b) Powered in Series With Line:
To
turn down power, remove the two upper fuses
associated with line 1 from
the
control
unit
directly below
the
faulty repeater.
Caution:
Removal
of
the
fuses
from
the
wrong
control
unit
will
interrupt
service
on
one
or
more
working
lines
associated
with
other
Tl
digital
lines.
2 Remove
the
faulty repeater from the
STA.
3 Select a
201K
and insert
it
into the repeater opening of the STA.
4 Restore power on
the
line by replacing the proper fuses removed in Step
1.
5 Notify the office
at
the other end of the span
that
the
repeater has been replaced and
the line is ready for test.
E.
Installation of
d
2080
tor
208AB.
Repeater in a 201
ORB
1 Select a
208D
tor
208AB• repeater and a
215A
adapter.
2
tlf
repeater being installed is a
208AB,
provide loop powering by setting powering option
to L.•
3 Insert the
215A
adapter into
the
repeater opening of
the
proper position in
the
STA as
determined from
the
span line record card.
Page
4
ISS
6,
SECTION
365-222.;,200
STEP
PROCEDURE
4
Insert
the
208D
•or
208AB• repeater into
the
215A
adapter.
F.
Replacement
of
a Repeater
in
a 201
ORB
With a
2080
tor
208AB.
Repeater
Caution: To
prevent
interruption
of
service
when
performing
this
task,
service
must
be
patched
off
per
Section
365-226-500.
1 Turn down power on
the
faulty repeater (see Fig. 1).
Note:
Power for
the
office repeaters can be
turned
down in only two ways, depending
upon how
the
repeater is powered.
(a) Powered Separately:
To
turn
down power, remove
the
office
repeater
OFF
REP
fuse from the control
unit
located directly below the faulty repeater.
(b) Powered in Series With Line:
To
turn
down power, remove the two upper fuses
associated with line 1 from the control
unit
directly below
the
faulty
repeater.
Caution:
Removal
of
the
fuses
from
the
wrong
control
unit
will
interrupt
service
on
one
or
more
working
lines
associated
with
other
Tl
digital
lines.
2 Remove
the
faulty
repeater
from the STA.
3
If
the
faulty repeater is a
201B,
201E,
•or
201K,. select a
215A
adapter
and
insert
it
into
the
repeater opening of
the
STA.
4 Select a
208D
•or
208AB• repeater.
5
•If
the repeater being installed is a
208AB,
provide loop powering by
setting
powering
option
to
L
.•
6
Insert
the
208D
•or
208AB• repeater into
the
215A
adapter.
7 Restore power on
the
line by replacing the proper fuses removed in Step
1.
8 Notify
the
office
at
the
other
end of
the
span
that
the
repeater
has
been replaced
and
the
line is ready for test.
G. Installation and
Testing
201-Type Bridging Repeater
1 Select a 201-type bridging repeater.
Note:
The power option for these repeaters is provided internally. No
LBO
network is
required.
2
Insert
the
repeater into
the
repeater opening of
the
proper position in
the
STAas
determined
froni
the
span line record card.
Page 5
SECTION
365-222-200
STEP
PROCEDURE
3
Insert
the
proper fuse in the office repeater OFF REP fuse holder on
the
control
unit
located directly below the bridging repeater (Fig. 1).
4 The repeater may now be tested to ensure proper operation.
5 Plug
the
-48V cord of the 10F FLS or 25AD FLTS into one of
the
-48V TST jacks on
the
jack mounting panel.
6
Plug
the
-48V cord of the EDS
or
OBVD
into another of
the
-48V TST jacks on
the
jack
mounting panel.
7 Connect a P3BH cord from
the
TEST jack of
the
10F FLS
or
the
GEN
MON
jack of
the
25AD
FLTS
to
the
IN
1 jack on
the
proper position of
the
STA.
Note: No plug should be in
the
GEN
OUT
jack of
the
10F FLS, since
this
disables
the
TEST
jack
output.
8
If
the
25AD FLTS is used,
set
the
CLOCK
RATE switch to
Tl.
Note: The
T1
indicator lights, indicating
that
the
T1
clock
in
the
FLTS
has
been selected
and
the
FLTS is powered.
9
Set
the
FUNCTION switch on
the
lOF FLS to BIPOLAR SIGNAL
or
the
25AD FLTS to
BI-POLAR SIGNAL and
the
PULSE PERIOD (lOF FLS)
to
REF
or PULSE DENSITY
(25AD FLTS) switch to
11
REF.
10
If
the
bridging. repeater is not connected to a
spare
line, terminate
the
OUT
1
jack
with
a
386B
plug.
11
Connect a P3BH cord from
the
IN
jack
of
the
EDS
or
the
SiG IN
jaek
of
the
OBVD
to
the
MON
(side 1
or
2)·
jaclt
of
the
repeater under test.
12
If
the
EDS'
is used, continue with Step·
13.
If
the
OBVD
is used,
proeeecl
to
Step
17.
•
Note;
Il
any
of
the
following requirements
are
not met, replace
the
bridging
repeater~
If
the
requir.ements are stili not met; refer
to
80~9'7080-01
.•
f3
Set
th:e·
PULSES~ERROR&
switch
on
the
EDS
to PULSES.
llequiretne:at: The lamp
on;
the
EDS is lighted, indieating proper regeneration
of
pulses
by
the
repeater.
Note: The lamp may light continuously
or
flfcker slightly.
Either
of these conditions
meets
the
l'ef}Uirement.
14 Set
the
PULSES-ERRORS switch
to
ERRORS.
Requirement:
The lamp
is
extinguished,. indicating error-free operation of
the
repeater.
ISS
6,
SECTION
365-222-200
STEP
PROCEDURE
Note:
The lamp
must
be completely extinguished.
It
must
not
flash occasionally.
15
Set
the
FUNCTION switch on the 10F FLS to MEAS 3
or
the
25AD FLTS to MEAS 3
SIGNAL.
Requirement:
The lamp on the EDS is lighted, indicating errors.
Note:
The lamp may light continuously
or
flicker slightly.
Either
of
these conditions
meets the requirement.
16
Proceed to Step
19.
17
Set
the MODE switch on
the
OBVD
to
BV,
the
TIMER switch to BEGIN,
and
depress
the START/RESET pushbutton.
Requirement:
The counter sets
to
all zeros,
the
UNDER TEST light is lighted,
and
all
other
lamps
are
extinguished.
18
Set
the
FUNCTION switch on the 10F FLS to MEAS 3
or
the 25AD FLTS to MEAS 3
SIGNAL.
Requirement:
The BIPOLAR VIOLATIONS lamp on
the
OBVD
is lighted
and
the
counter
indicates errors.
19
Repeat Steps
•9•
through
18
to
test
side 2 of
the
bridging repeater.
20
When
the
requirements
are
met
for sides 1 and
2,
remove all plugs
and
test
connedions.
H. Installation of 206-Type Office Repeater
1 Select
the
206-type repeater shown on
the
span line record card.
2 Provide the proper power option by
turning
down
the
option screws
in
accordance
with
Section 365-223-500
and
the
span line record card. Turn back all unused option screws
two complete
turns
counterclockwise (Fig.
2,
3,
or
4).
3 •Record options selected
and
repeater type on Form E-5416, Office Repeater Record Card
(Fig.
5)
.•
4
If
the
repeater is a nonintegrated circuit type, select
the
836-type
LBO
network shown on
the
span line record card.
If
the
selected repeater is
an
integrated circuit type, proceed
to Step 6 because no
LBO
is required; otherwise, continue with Step
5.
5
Insert
the selected network into
the
repeater. Securely tighten the screws in the network
to provide a good electrical connection. Proceed to Step 10.
6
If
the repeater is an EXCP type (Table
A),
continue with Step
7;
otherwise, proceed to
Step
10.
Page 7
SECTION
365-222-200
STEP
PROCEDURE
7 Select a 983-type equalizer according to span line record card and Table B for installation
in
the
repeater.
8 Connect the pigtailed wires on
the
equalizer to the points on
the
repeater
as
shown in
Fig.
4.
9 Install the equalizer in the repeater (Fig.
6)
and insert the correct color plug button into
the
hole in the faceplate of the repeater.
Note:
To
restrict the use of 206-type repeater positions to
the
correct type
of
repeater,
keys are provided in each connector on
the
repeater shelves. These keys
are
normally
provided in jack contact 8 of the connector.
10
Note
the
required keying listed
i:n
Table C for
the
206-type repeater being installed.
11
If
necessary, relocate the key to the proper jack contact.
12
Insert
the
repeater into the assigned shelf position in
the
repeater bay
per
the span line
record card.
13
•verify
that
the span number office repeater type and powering, power loov voltage and
current, and repeater powering options are recorded
on
Form E-5416, Office Repeater
Record Card (Fig.
5)
.•
I. Replacement
of
206-Type Office Repeater
Caution:
To
prevent
interruption
of
service
when
performhlg
this
task,
service
must
be
patched
off
per
Section
365-226-500.
1 Remove the faulty repeater from
the
repeater bay.
2 Select a
206
replacement repeater.
3 Refer
to
Form E-5416 (Fig.
5)
and apply the same power options (Fig.
2,
3,
or
4)
as
those
used
on
the faulty repeater. Turn back all unused option screws two ce.inplete
tarns
counterclockwise.
Warning: A
fire
hazard
exists
if
ground
option
P in
the
206B
or
206F
repeater
is
improperly
applied
for
178-
or
260-volt
line
powerifig.
Refer
to
Section
365-223-500'
for
instructions
before
replacbtg
tbe
repeater.
4
•verify
that
the
replacement repeater has
the
same type fuses installed
in
the
front panel
as those in the faulty repeater
.•
5
If
the repeater being replaced is an integrated circuit type,
pr@ceed
to Step.
8;
otherwise,
continue with Step
6.
Page 8
(
ISS
6,
SECTION
365-222-200
STEP
PROCEDURE
6 Remove the 836-type
LBO
network from
the
faulty repeater
and
insert
the
network
in
the
mounting location on the replacement repeater. Securely tighten
the
screws on
the
network to provide a good electrical connection.
7 Verify
the
836-type network assignment with
the
span line record card before
the
new
repeater is placed in
the
repeater bay. Proceed to Step
12.
8
If
the
repeater is
an
EXCP type (Table A), continue with Step
9;
otherwise, proceed to
Step
12.
9 Remove the 983-type equalizer
and
the
plug button from
the
faulty repeater.
10
Connect
the
pigtailed wires on
the
equalizer to
the
points on the replacement
repeater
as
shown in Fig.
4.
11
Install the equalizer in
the
repeater (Fig. 6)
and
insert
the
plug
button
into
the
hole
in
the faceplate of the repeater.
12
Insert
the
replacement repeater into
the
assigned shelf position in
the
repeater
bay.
13
Notify the office
at
the
other end of
the
span
that
the
repeater
has
been replaced
and
that
the line is ready for test.
•Note:
If
the replacement
repeater
is
an
EXCP type
and
the
problem is still not cleared,
there
is a remote possibility
that
the
983-type equalizer is faulty. Therefore, replace
the
983-type equalizer with a known-good equalizer and
repeat
Step
13
.•
J.
Installation
and
Testing
of
206-Type
Bridging Repeater
1 Select a 206-type bridging repeater.
Note:
The power option for
this
repeater is provided internally. No line build-out
network is required.
2
Insert
the
repeater into
the
proper shelf (position
26)
in
the
repeater bay
as
determined
from the span line record card.
3 The repeater may now be tested to ensure proper operation.
4 Plug
the
-48V cord of
the
10F FLS
or
25AD FLTS into one of the -48V TST jacks on
the repeater bay jack field
or
the
DSX-1
maintenance panel.
5 Plug
the
-48V cord of
the
EDS
or
OBVD
into
the
-48V TST
jack
on
the
repeater
bay
jack
field
•or
the
DSX
-1
maintenance
paneU
6 Connect a P3BH cord from
the
TEST
jack
of the 10F FLS or
the
GEN
MON
jack
of
the
25AD FLTS to the B IN jack on
the
repeater
front
panel or
the
IN
jack
at
position
25
of
the
DSX-1 panel for
the
repeater under test.
Page
9
SECTION
365-222-200
STEP
PROCEDURE
Note:
No
plug should
be
in
the
GEN
OUT
jack of
the
10F FLS, since this disables
the
TEST jack output.
7
If
the
25AD
FLTS is used, set
the
CLOCK
RATE switch to
Tl.
Note:
The
T1
indicator lights,.indicating
that
the
T1
clock in the FLTS has been selected
and
that
the
FLTS is powered.
8 Set the FUNCTION switch on
the
10F FLS to BIPOLAR SIGNAL
or
the
25AD FLTS to
BI-POLAR SIGNAL and
the
PULSE PERIOD (10F FLS) to REF or PULSE DENSITY
(25AD
FLTS) switch to
11
REF.
9 Terminate
the
R
OUT
jack (if equipped) on the repeater with a
386B
plug.
10
Connect a P3BH cord from the IN jack of the EDS or the SIG IN jack of the
OBVD
to
the
MON
jack on
the
repeater
•or
the
BR
MON
jack on the
DSX-1
maintenance
paneU
11
If
the EDS is used, continue with Step
12.
If
the
OBVD
is used, proceed to Step
16.
•Note:
If
the following requirements are not met, replace the bridging repeater.
If
the
requirements are still not met, refer
to
SD-97080-02
.•
12
Set
the
PULSES-ERRORS switch
on
the EDS to PULSES.
Requirement:
The lamp on the EDS is lighted, indicating proper regeneration of pulses
by the repeater.
Note:
The lamp may light continuously
or
flicker slightly.
Either
of these conditions
meets the requirement.
13
Set the PULSES-ERRORS switch to ERRORS.
Requirement:
The lamp on the EDS is extinguished, indicating error-free operation of
the
repeater.
Note:
The lamp must
be
completely extinguished.
It
must not flash occasionally.
14
Set the FUNCTION switch on
the
lOF
FLS to MEAS 3 or
the
25AD
FLTS to MEAS 3
SIGNAL.
Requirement:
The lamp on
the
EDS is lighted, indicating errors.
Note:
The lamp may light continuously
or
flicker slightly.
Either
of these conditions
meets the requirement.
15
Proceed to Step
18.
16
Set the
MODE
switch
on
the
OBVD
to
BV,
the timer switch to BEGIN, and depress
the
START/RESET pushbutton.
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10