ATtkT 462-250-110
issue 2, July 1988
AT&T PRACTICE
Standard
CONNECTORS AND 76-TYPE BINDING POSTS
WIRING
CROSS-CONNECT
METHODS
80-TYPE CABINETS
PAGE
CONTENTS
1. GENERAL
.
.
2. PRECAUTIONS
.
.
.
.
.
.
.
.
.
.
.
.
.
.
3. METHOD OF PAIR IDENTIFICATION
.
.
.
.
3. Verifying
tors
.
1
.
.
.
.
2
.
.
.
.
2
4. TERMINATING CROSS-CONNECTING WIRE IN
80-TYPE CABINETS EQUIPPED WITH 108-TYPE
CONNECTORS
. . . . . . . . . . .
Feeder-In Pair—108-Type
. . . . . . . . .
Connec. . .
5
4. Terminating Cross-Connecting
Wire on Distribution Field—1 08-Type Connectors
. .
6
5. Seating and Cutting
. . . . . . .
7
the
Wire
.
24-Gauge
. . .
.
.
F
.
5. TERMINATING CROSS-CONNECTING WIRE IN
80-TYPE CABINETS EQUIPPED WITH 76-TYPE
BINDING POSTS.
. . . . . . . . . .
A. Terminating
Cross-Connecting
the
Wire
22-Gauge
. . . .
6. REMOVING AND REGERMINATING
CONNECTING WIRES . . . . .
A. 108-Type
B. 76-Type
7. IDENTIFYING
A. 108-Type
B. 76-Type
.
G
. .
.
.
Finger Loop
Feeder-In
. . .
Cross-Connecting
.
.
.
.
.
.
14
12. Cutting
SPECIAL CIRCUITS
.
.
.
.
.
15
Connecting
.
.
.
.
.
15
.
.
15
.
.
15
Posts
8. ISSUING ORGANIZATION
.
.
t,..
.
.
.
.
.
.
.
7
Wire to Assigned
. . . . . . .
8
Wire.
.
.
.
.
.
11
Loop and Placing Wire in
. . . . . . . . . .
12
14
14
Binding
.
Pair—76-Type
. . . . .
.
10
.
Blocks
.
9
.
.
.
Wire on Dis9. Terminating Cross-Connecting
tribution Field—76-Type
Binding Post
. .
.
Posts
.
9
.
Binding
.
Binding
. . .
.
.
Blocks
Wire
. .
8. Verifying
Post .
11. Forming Finger
Wiring Trough.
Connecting
.
9
10. Routing
.
Cross-Connecting
. . . . . .
7. Routing Cross-Connecting
Feeder Pair . . . . .
4
CROSS-
.
.
4
6. Forming
A. Terminating
Cross-Connecting
PAGE
CONTENTS
Cross-Connecting
13. Removing
Cross-Connecting
.
.
.
.
13
Wire .
.
.
.
14
Wire .
14. Placing Clip Terminal Insulator for Special
Circuit- Identification
—108-Type
Connectors
. . . . . . . . . . . ...15
15. Placing Clip Terminal Insulator for Special
—76-Type
Binding
Circuit
Identification
Posts . . . . . . . . . . . . ..15
Figures
Cabinets Equipped With Three Panels of 108Type Connectors.
. . . . . . . . .
1.
1. Method of Pair identification-80-Type
2. Method of Pair identification-80-Type
inets Equipped With Three Panels
Type Binding Posts . . . . . .
Cabof 76. . .
3
4
GENERAL
This practice covers the method for running
cross-connecting
wire between the feeder and
distribution cable terminations in 80-type cabinets
equipped with 108-type
connectors
and 76-type
binding posts.
1.01
Copyright @ 1988 AT&T — AH Rights Reserved
Printed in U.S.A.
Page 1
AT&T 402-250-110
This practice is reissued to update text and
illustrations. Since this is a general revision,
change arrows are omitted.
1.02
2.
PRECAUTIONS
To avoid excessive buildup of wire inside the
cabinet, remove any cross-connecting wire that
is not to be reterrninated.
3.
METHOD OF PAIR IDENTIFICATION
Before proceeding, the craft personnel must
become familiar with the pair identification
method for an 80-type cabinet. The SAI (serving area
interface) or FDI (feeder distribution interface) arrangements can be equipped with either 108-type connectors (Fig. 1) or 76-type binding posts (Fig. 2).
3.01
2.01
To avoid a tracing problem, leave a sufficient
amount of slack for movement of the crossconnecting wires.
2.02
To avoid damaging the cross-connecting wires,
always use an orange stick or equivalent to
dress the wires. Also, use only approved tools for
terminating the wires. Do not use a screwdriver or
scissors.
2.03
To avoid cross-connecting wire breaks, use only
G cross-connecting
wire with the 76-type
binding post.
(a) The binding post count is left to right and top to
bottom of each panel.
(b) The feeder cables are terminated in the green
field, and the distribution cables are terminated
in the blue field.
3.02
The 80B cabinet houses FDIs of 1800 pairs using
76-type binding posts or 2700 pairs using 108type connectors.
3.03
The 80C and 80D cabinets have three standard
SAI or FDI arrangements.
●
A small two panel FDI arrangement
pairs, 76-type binding posts or 1200
108-type connectors).
●
A three panel SAI arrangement [1800 pairs,
76-type binding posts (Fig. 2) or 2700 pairs,
108-type connectors (Fig. l).]
●
A four panel FDI arrangement (2400 pairs,
76-type binding posts or 3600 pairs, 108-type
connectors).
2.04
To avoid damaging the slotted beams of the
108-type
connectors,
use
only
F
cross-connecting wire that is the correct diameter for
insertion between the slotted beams of the connector.
(1000
pairs,
2.05
Page 2
I
1SS 2, AT&T 462-250-110
.
FEEDER
FIELD
(PAIRS 1–600)
DISTRIBUTION
(PAIRS 1–600)
FIELD
(G REENI
DISTRIBUTION
FIELD
(PAIRS 601–1200)
(BLUE)
\
(BLUE)
l“”’
I
I
k—--------t-
F
t--
I
,.
DOTTEO
LINES INDICATE
PROPER PATH
FOR RUNNING
CROSS CONNECTING
WIRE
BETWEEN
FEEDER AND DISTRIBUTION
Fig. l—Method
of Pair identification—80-Type
108-Type Connectors
Cabinets
Equipped
With Three Panels of
Page 3
AT&T 462-250-110
DISTRIBUTION
(BLUE) (PAIRS
FIELD
1–600)
FEEDER
(G REENI
FIELD
(PAIRS
1–600)
DISTRIBUTION
FIELD
(BLUE)
(PA IRS601–1200J
DOTTED
LINES INDICATE
PROPER PATH
FOR RUNNING
CROSS CONNECTING
WIRE
BETWEEN
FEEDER
AND DISTRIBUTION
BINDING
POST
Fig. 2—Method of Pair Identification
76-Type Binding Posts
—80-Type
4.
TERMINATING CROSS-CONNECTING
WIRE IN 80TYPE CABINETS EQUIPPED WITH 108-TYPE CONNECTORS
A.
Terminating
4.01
Page 4
the 24-Gauge
F Cross-Connecting
Wire
Locate the feeder-in pair specified on the service
order. Remove the test cord from the door, raise
Cabinets
Equipped
With Three Panels of
the environmental shield, and place the spring clips of
the test cord on the specified feeder-in pair. Attach the
clips from the handset cord to the binding posts on the
door and verify the feeder-in pair (Fig. 3).
It is recommended that the distribution
Note:
pair be terminated first. Leave the test cord on
the feeder pair to provide easier feeder-pair
identification.
1ss 2, AT&T 4s2-250-110
TEST CORD ATTACHED
TO
SPECIFIED
FE EDER-l N PAIR
Fig. 3—Verifying
Feeder-In
Pair—1 08-Type
Connectors
Page 5
AT&T 462-250-110
Locate the assigned distribution
pair. Pull
enough cross-connecting wire from the spool to
reach the assigned distribution pair. Then, raise the
environmental shield and insert the F cross-connect
wire into the block, splitting the tip and ring conductors over the black high tooth (Fig. 4). The tip conductor is on the left, and the ring conductor is on the
right.
4.02
Caution:
Use only F cross-connecting
wire when placing
cross connections
on
108- type connectors.
G cross-connecting
wire may damage slotted beams due to its
larger diameter.
ENVIRONMENTAL
SHIELD
4.03
Using the insertion cutoff tool, seat and cut the
cross-connecting wire (Fig. 5).
Use only approved
tools for
Caution:
terminating
cross-connecting
wire. Do not
use a screwdriver.
To cut the cross-connecting wire, always
Note:
place the cutting bIades of the 788NI insertion
cutoff tool (supplied with the cabinet) on the
same side as the designation strip.
TERMINATING
CROSS-CONNECTING
WIRE TO DISTRIBUTION
FIELD
108
Fig. 4—Terminating
Page 6
Cross-Connecting
Wire on Distribution
CONNECTORS
Field—108-Type
Connectors
ATaT 462-250-110
FORMING
\..:
“
..-:
---—
—
FINGER
LOOP
WIRING
SLOT
- —-.
~,;
‘-!9.
.
INSERT IO NC UTOFF
———————
TOOL
1.
Fig. 5—Seating
and Cutting
Cross-Connecting
I
ii
Wire
Push the terminated wires to the rear of the
wiring channel between the connecting blocks.
Position the wires along the channel, through the
wiring slots, and into the wiring trough. Form a finger
loop to provide 2 inches of slack (Fig. 6). These finger
loops allow a sufficient amount of slack for movement of the cross-connecting
wire for tracing.
4.04
Fig. 6—Forming
Finger Loop
Page 7
AT&T 482-250-110
cross-connecting
wire to the rear of channel (Fig. 7).
Remove the test cord from the previously tested feeder
pair and terminate the cross-connecting
wire as outlined in paragraphs 4.02 and 4.03.
Route the cross-connecting
wire within the
wiring trough to the feeder field; form a finger
loop of slack and place wire in the fanning strip. Raise
the
environmental
shield
and
push
the
4.o5
WIRING
ENVIRONMENTAL
SHIELO
TEST
Fig. 7—Routing
Page 8
CORD
Cross-Connecting
TROUGH
I
FEEOER
Wire to Assigned
Feeder Pair
FIELO
1SS 2, AT&T 462-250-110
5.
TERMINATING CROSS-CONNECTING
WIRE IN 80TYPE CABINETS EQUIPPED WITH 76-TYPE BINDING
POSTS
A.
Terminating
the 22-Gauge
G Cross-Connecting
Wire
Use only G cross-connecting
Caution:
wire with the 76-type
binding
post. The
smaller diameter
F cross-connecting
wire
breaks when the binding post screw is tightened.
Locate the feeder-in pair specified on the service
order. Remove the test cord from the door.
Squeeze the spring clip on the test cord, and place the
clip on the specified feeder-in pair. Attach the clips
from the handset to the binding posts on the door, and
verify the feeder-in pair (Fig. 8).
5.o1
It is recommended that the distribution
Note:
pair be terminated first. Leave the test cord on
the feeder pair to provide easier feeder-pair i(
tification.
TEST CORD ATTACHED
TO
SPECIFIED
FEEDER-IN
PAIR
..
v.
.
.“,
.,.—
,.
.
.
..
K
*
s
“
;
i
“i
..”.
. .
. .. .
. . . . .
Fig. 8—Verifying
Feeder-In
Pair—76-Type
Binding
..
.
.
.
. ..
‘*.
..
.
Post
Page 9
AT&T 462-250-110
Locate the assigned distribution
pair. Puh
enough cross-connecting wire from the spool to
reach the assigned distribution pair binding post. Strip
about 1 inch of insulation from the ends of the
cross-connecting
wire. Do not nick the conductors.
Using a screwdriver, loosen the screw on the binding post.
5.02
Place wires between washers on the binding
post. Do not cross-over the wires. Tighten the
screw finger tight plus 1/4 turn with the screwdriver.
Do not overtighterr. Cut the excess length of wire at
the binding post and remove the wire clippings (Fig.
9).
5.03
INSULATION
REMOVED
FROM ENDS
OF CROSS-CONNECTING
WIRE
,..
SCREWDRIVER
Fig.
Page 10
9—Terminating
Cross-Connecting
SCREW ON BINDING
Wire on Distribution
POST
Field—76-Type
Binding
Post
1SS 2, AT&T 452-250-110
Using
an orange
stick,
dress
the
cross-connecting
wire horizontally along the
binding post row (Fig. 10).
5.04
Caution:
scissors
Do not use a screwdm”ver
to dress the wires.
ORANGE
or
STICK
Fig. 10—Routing
5.o5
Place the wire through the wiring trough slot,
form a finger loop, and dress wires to the rear of
the trough (Fig. 11). These finger loops allow a
sufficient amount of slack for movement of the crossconnecting wire for tracing.
BINDING
POST ROW
Cross-Connecting
Wire
Page 11
AT&T 462-250-110
Fig.
Page 12
1—Forming
Finger Loop and Placing
Wire in Wiring Trough
1SS 2, AT&T 462-2S0-110
Route the cross-connecting wire to the assigned
feeder bkding post, and cut to the required
length (Fig. 12). Remove the test cord from the previ-
5.06
ously tested feeder pair, and terminate the crossconnecting wire as outlined in paragraphs 5.02 and
5.03.
CR OSSCONNECTING
Fig. 12—Cutting
Cross-Connecting
WIRE
Wire
Paga 13
AT&T 462-250-110
6.
REMOVING
AND
REGERMINATING
CROSS-CONNECTING WIRES
A.
108-Type
Connecting
6.02
After removing the cross-connecting wire, make
sure there is no insulation left in the block. In
the event that there is insulation left in the block,
remove the insulation using an orange stick or other
insulated tool.
Blocks
Using long-nose
pliers, remove the crossconnecting wire by pulling it forward in a
direction perpendicular to the face of the wiring block
(Fig. 13). If the cross-connecting
wire is not to be
regerminated, remove it from the cabinet. This prewire and
vents excessive buildup of cross-connecting
helps maintain good housekeeping.
6.01
6.03
To regerminate the cross-connecting
wire, cut
off the old contact part of the wire and
reterrninate as outlined in paragraphs 4.02 and 4.03. If
the wire is not long enough to leave the proper amount
of slack, replace the wire, Do not piece out.
B.
76-Type
Binding
Posts
Loosen the binding post screws, and remove the
cross-connecting wire from the feeder side first.
If the cross-connecting wire is not to be regerminated,
remove the wire from the cabinet. This prevents
excessive buildup of wire and helps maintain good
housekeeping.
6.04
6.05
To regerminate the cross-connecting
wire, cut
off the contact
portion
of the wire and
reterrninate as outlined in paragraphs 5,02 and 5,03. If
the wire is not long enough to leave the proper amount
of slack, replace the wire. Do not piece out.
REMOVING
CROSS-CONNECTING
USING LONG.NOSE
PLIERS
Fig. 13—Removing
Page 14
WIRES
Cross-Connecting
Wire
1ss 2, AT&T 462-250-110
IDENTIFYING
7.
SPECIAL CIRCUITS
76-Type
B.
7.02
A.
7.01
108-Type
Connecting
Blocks
Binding
Posts
When cable pairs are used for special services, it
will be necessary to identify the circuits bY
placing a binding post insulator (AT-6798) over the
pair at the feeder and distribution termination as
shown in Fig. 15.
When cable pairs are used for special service, it
will be necessary to identify the circuits by
placing an H clip terminal insulator (AT-8660-H) over
the pair at the feeder and distribution terminal as
shown in Fig. 14.
.,
Fig. 15—Placing
Circuit
8.
Clip Terminal Insulator for Special
—76-Type Binding Posts
Identification
ISSUING ORGANIZATION
Published by
The AT&T Documentation
Fig. 14-PkIcing
Circuit
Management
Organization
Ctip Terminal Insulator for Special
—108-Type Connectors
Identification
Page 15
15 Pages