BELL SYSTEM PRACTICES
SECTION 461-400-150
AT&TCo
Issue 2, January
Standard
625TD
CONNECTING
IDENTIFICATION
STANDARD
CUSTOMER
NETWORK
PARTICIPATION
This section provides information
on the
625TD connecting block which is the standard
net~vork interface for new service arrangements.
(a) Expand information
necting block
on wiring of 625TD con-
designations
g
K
3.
The 625TD connecting block shall be installed
at a point inside the customer premises \vhere
the customer or customers representative
has control
of access to it. This point should be as close as possible to the main entrance terminal or drop termination, and still meet the above requirements.
In single
family units with unfinished basements, the 625TD
would normally be mounted directly through the \vall
from the outside mounted protector. In multiunit
construction, finished basements, slab construction,
etc, the 625TD location must be negotiated with the
builder at the time of construction since it must interface with the distribution facilities as well as \vith
the premises inside wiring.
(a) 625T swinger assembly
block base
unit
(d) Plastic covered
(Fig. 2).
silver
foil instruction
label
The 625TD connecting
block should
be
mounted in a horizontal plane with the modular jack to the right as you face the jack, so the instruction label can be read and the jack cover strings
upward.
3.02
A second connecting block, coded 625 TD-2,
will be made available w-hich will contain a
second terminating
unit when terminating
a second
line in the same connecting block.
2.02
2.03
INSTALLATION
3.o1
The 625TD connecting block assembly (Fig. 1)
is made up of the following:
(c) Line termination
The terminating
unit must always
be used with the 625 TD connecting
block.
R
and extra callouts
IDENTIFICATION
(b) 42B connecting
company
The termination unit in the 625TD connecting
block provides a recognizable capacitive loop
test (approximately
1/2 of a normal ringer) to Bell
System test equipment. This prevents the line from
testing open (unterminated)
when terminal equipment is disconnected from the connecting block modular jack.
Revision arrows are used to emphasize the more significant changes. The Equipment Test List (ETL) is
not affected.
2.01
PRODUCTS
2.04
1.02 This section is reissued to:.
2.
‘ ~;-;q$
f--J:,
#. !
L =-.5/,;}.
;
~jR,, ,; ;n p ?%; . f
i a:m,~ ‘i4! #~,.+J
..-.
j’
r=
—-’----_.__-=
j
-..+
premise wiring and Bell System telephone
network facilities.
1.01
(b) Add terminal
to Fig-. 1.
INTERFACE
ARRANGEMENTS
GENERAL
1.
BLOCK
AND INSTALLATION
NEW SERVICE
1982
The 625TD connecting block will be the standard network interface
between customer
3.03
Breakouts have been pro~’ided in the connecting block base at the bottom and at the ends.
NOTICE
Not for use or disclosure
Bell System
except under
Printed
outside
written
in [J,S.A.
the
agreement
Page 1
SECTION 461-400-150
It is recommended that the bottom entrance be used
and that no other breakouts be made in the base
other than the entrance used. This will maintain
maximum resistance to humidity and contamination.
(b) A two line termination
block:
(1) The ring of the first line, one lead of the terminating unit, and the red Ica(i of the jack
on terminal R.
The box should be mounted so there is sufficient space around it for bridging arrangements. This unit will normally be used in conjunction
with an entrance bridge which may be company or
customer provided.
3.o4
(2) The tipof the first line, the other lead of the
terminating
unit, and the gr(’en lead of the
jack on terminal G.4
The wiring of the 625TD should be as follows:
3.05
(a) $A one line termination
block:$
– 625TD connecting
(3) The rin~ of the second line, one lead of the
second terminating
unit, and the yello~r
lead of the jack on terminal Y.
(1) The ring of the first line, one lead of the terminating unit, and the red lead of the jack
on terminal R.
The tip of the second line, tht’ other lc’ad of
the second terminating
unit, an(] the black
lead of the jack on terminal Il.
(4)
(2) The tip of the first line, the other lead of the
terminating unit, and the green lead of the
jack on terminal G.
After the installation has bcwn conll)]eted, the
customer should be advise(l of the standar(l
netlvork interface, its location, and the instructions
on the label.
3.06
(3) $The yellow lead of the jack on terminal
(4) The black lead of the jack on terminal
Page 2
Y.
B.
– 625T1)-2 connecting
i
1SS2, SECTION 461-400-150
/
Y
I
1
‘1
R2(Y)
T2(BK)
,,.
.lTNE
$
‘“’A’h
TERMINATII)N
IT
(R)
f
\
\
FOR
FIRST
LINE
TERMINATION
xl
T1(G)
\
WIR
BRE
o
BREAKOUTS
TING
BASE
WIRE
BREAKOUT
Fig. l—$Exploded
RECEIVING
TERMINATION
SERVICE
View
SLOTS
FOR THE SECONO
UNIT FOR TWO LINE
of 625TD Connecting
LINE
Blockt
Page 3
SECTION 461-400-150
DISCONNECT
PLUG
THIS JACK DURING
INSTALLATION
AND
REPAIR
OF
WIRING
●
TESTING
FROM
M
@
PLUG WORKING
PHDNE DIRECTLY U--.-J
INTO THIS JACK.
IF
PHONE OPERATES.
FAULT
IS IN WIRING.
IF PHONE
DOES NOT OPERATE,
REPAIR
SERVICE
CALL
I \
PLUG-ENDED
CORD
l\
INSTRUCTION
LABEL
Fig. 2—~625TDor
I
f
f
Page
4
4 Pages
625TD-2
Connecting
Blockt