Sec. 68.502 Configurations.
This section describes connection configurations which telephone
subscribers may request their local telephone company to provide, in
accordance with Sec. 68.104 of these rules. In the absence of a request
for a specific jack configuration, the telephone company shall install
the standard jack depicted in Sec. 68.502(a)(1). The listed
configurations are for connections to be made by the telephone company
to the standard jacks specified in this subpart. Plugs on registered
terminal equipment and registered protective circuitry shall be wired so
as to be compatible with the jack connections specified herein. The
following nomenclature is used in this section:
T/R--Connections to the ``tip'' and ``ring'' wires of a telephone
communications line, trunk, channel or facility.
A/A1--Connections to the ``hold'' functions of key telephone systems
which use such connections. In such systems, the ``A'' lead
corresponding to a particular telephone line is shorted to the ``A1''
lead when that line is placed in the ``off-hook'' state to permit proper
operation of the ``hold'' functions associated with that line.
MB/MB1--Connections to leads implementing a make-busy feature where
required. The MB lead is shorted by the terminal equipment to the MB1
lead when the corresponding telephone line is to be placed in an
unavailable, or artificially busy condition.
Bridged--A bridged connection is a parallel connection.
[[Page 370]]
Data--Data configurations are those which use jacks incorporating
components to limit signal power levels of data equipment. Data
equipment with a maximum signal power output of -9 dBm may be connected
to other than data configurations. See Sec. 68.308 of these rules.
A ``USOC'' (Universal Service Ordering Code) is specified for each
configuration. These USOCs are generic telephone company service
ordering codes. If a telephone subscriber wishes to have the telephone
company install a standard jack other than the one depicted in
Sec. 68.502(a)(1) below, he shall specify the appropriate USOC when
requesting the installations.
(a) Bridged configurations other than data; single line
connections--(1) Bridged T/R; 6-position jack.
Electrical Network Connection: Single line bridged tip and ring only--
Conductors 1, 2, 5 and 6 are reserved for telephone company use.
Universal Service Order Code (USOC): RJ11W for Portable Wall-Mounted
equipment--RJ11C all others.
Mechanical Arrangement: Miniature 6 position jack.
Typical Usage: Single line non-key telephone, ancillary devices, PBXs
and key telephone systems.
Wiring Diagram:
[GRAPHIC] [TIFF OMITTED] TC02JN91.068
(2) Bridged T/R; 3-position weatherproof jack.
Electrical Network Connection: Single line bridged tip and ring.
Universal Service Order Code: RJ15C.
Mechanical Arrangement: 3 position weatherproof jack.
Typical Usage: Providing telephone service to boats in marinas.
Wiring Diagram:
[[Page 371]]
[GRAPHIC] [TIFF OMITTED] TC02JN91.069
(3) Bridged T/R with make-busy arrangement; 6-position jack.
Electrical Network Connection: Single-line bridged tip and ring only
with MB/MB1 leads. Conductors 2 and 5 are reserved for telephone company
use.
Universal Service Order Code (USOC): RJ18W for portable wall-mounted
equipment--RJ18C for all others.
Mechanical Arrangement: Miniature 6-position jack.
Typical Usage: Single-line non-key telephone and ancillary devices
connected directly to central office lines, where a make-busy
requirement is needed.
Wiring Diagram:
[[Page 372]]
[GRAPHIC] [TIFF OMITTED] TC02JN91.070
(b) Series configurations--(1) Series T/R ahead of all station
equipment; 8-position series jack.
Electrical Network Connection: Series tip and ring ahead of all station
equipment. Conductors 2, 3, 6 and 7 are reserved for telephone company
use.
Universal Service Order Code (USOC): RJ31X.
Mechanical Arrangement: Miniature 8 position series jack.
Typical Usage: Alarm reporting devices.
Wiring Diagram:
[[Page 373]]
[GRAPHIC] [TIFF OMITTED] TC02JN91.071
(2) [Reserved]
(3) Series single-line tip and ring ahead of all station equipment;
8-position series jack equipped with continuity circuit.
Electrical Network Connection: Series tip and ring ahead of all station
equipment with continuity circuit. Conductors 3 and 6 are reserved for
telephone company use.
Universal Service Order Code (USOC): RJ38X.
Mechanical Arrangement: Miniature 8-position series jack.
Typical Usage: Alarm reporting devices.
Wiring Diagram:
[[Page 374]]
[GRAPHIC] [TIFF OMITTED] TC02JN91.072
(c) Two-line configurations--(1) Bridged T/R; 6-position jack.
Electrical Network Connection: Two line bridged tip and ring.
Universal Service Order Code (USOC): RJ14W for Portable Wall-Mounted
equipment--RJ14C for all others.
Mechanical Arrangement: Miniature 6-position jack.
Typical Usage: Two line non-key telephone sets and ancillary devices.
Wiring Diagram:
Note: The telephone company will wire the lines to the jack in the
sequence designated by the customer.
[[Page 375]]
[GRAPHIC] [TIFF OMITTED] TC02JN91.073
(d) Multiple-line bridged configurations--(1) Up to 25 bridged T/R;
50-position jack.
Electrical Network Connection: Multiple line bridged tip and ring.
Universal Service Order Code (USOC): RJ21X.
Mechanical Arrangement: 50-position miniature ribbon jack.
Typical Usage: Traffic data recording systems, PBXs and key telephone
systems.
Wiring Diagram:
Note: At the time the jack is ordered the customer must specify the
sequence in which the central office lines are to be connected to the
jack. The telephone company will consecutively wire these lines to the
jack as shown below without skipping any positions.
[[Page 376]]
[GRAPHIC] [TIFF OMITTED] TC02JN91.074
(2) Bridged multiple-line 50-position T/R with make-busy
arrangement.
Electrical Network Connection: Multiple line bridge tip and ring with
MB/MB1 leads for make-busy indication.
Universal Service Ordering Code (USOC): RJ2MB.
Mechanical Arrangement: 50-position miniature ribbon jack.
Typical Usage: 2-12 non-key telephone and ancillary devices connected
directly to central office lines where a make-busy requirement is
needed.
Wiring Diagram:
[GRAPHIC] [TIFF OMITTED] TC02JN91.075
[[Page 377]]
(e) Data configurations. There are two categories of data
configurations, which may be implemented either on an 8 position keyed
data jack, or on a 50 position unkeyed ribbon jack. These are: a
``universal'' configuration, which incorporates both a programming
resistor (for programmed data signal power limiting) and an attenuator
(for ``fixed-loss loop'' data signal power limiting), and a
``programmed'' configuration, which incorporates a programming resistor,
but not an attenuator. The programming resistor is selected as follows:
The proper programming resistor (Rp) shall be selected by the
telephone company at the time of installation based upon the loop loss
of the telephone line to arrive at the optimum signal power level of -12
dBm at the central office. The table shown below gives the required
signal power output for the programmed data equipment for each value of
the programming resistor.
------------------------------------------------------------------------
Programmed Data
Programming Resistor (Rp)* Equipment Signal
Power Output**
------------------------------------------------------------------------
short................................................ 0 dbm
150 ohms............................................. -1 dbm
336 ohms............................................. -2 dbm
569 ohms............................................. -3 dbm
866 ohms............................................. -4 dbm
1,240 ohms........................................... -5 dbm
1,780 ohms........................................... -6 dbm
2,520 ohms........................................... -7 dbm
3,610 ohms........................................... -8 dbm
5,490 ohms........................................... -9 dbm
9,200 ohms........................................... -10 dbm
19,800 ohms.......................................... -11 dbm
open................................................. -12 dbm
------------------------------------------------------------------------
* Tolerance of Rp is &177; 1%.
** Tolerance of programmed data equipment signal power output is 1 dB.
The voltages impressed on resistor Rp by the data equipment shall be
such as not to cause power dissipation in Rp in excess of 50 milliwatts.
The circuit shown below was used in calculating values of the
programming resistors and may be useful in implementing the automatic
control of signal power output in the programmed data equipment.
[GRAPHIC] [TIFF OMITTED] TC02JN91.076
R1 is the source impedance for the input signal Vin, and also the
terminating impedance of the load. RS is a series resistance,
on which the computation of the programming resistor Rp is based. The
table of values of Rp is derived for R1=600 ohms;
RS=3600 ohms.
In ``universal'' configurations, the proper attenuator shall be
installed or adjusted by the telephone company at the time of
installation, based upon the loop loss of the telephone line, to arrive
at the optimum power level of -12 dBm at the central office, with a data
device maximum signal power level of -4 dBm.
The switch which is incorporated in ``universal'' configurations
shall be operated to the position appropriate for the type of data
equipment which is connected.
(1) Bridged T/R; 8-position keyed data jack--Universal.
Electrical Network Connection: Single line bridged tip and ring.
Universal Service Order Code: RJ41S.
Mechanical Arrangement: Single miniature 8-position keyed jack for
surface mounting.
[[Page 378]]
Typical Usage: Universal jack for fixed loss loop (FLL) or programmed
(P) types of data equipment.
Wiring Diagram:
[GRAPHIC] [TIFF OMITTED] TC02JN91.077
(2) Bridged T/R; 8-position keyed data jack--Programmed.
Electrical Network Connection: Single line bridged tip and ring.
Universal Service Order Code: RJ45S.
Mechanical Arrangement: Single miniature 8-position keyed jack for
surface mounting.
Typical Usage: Programmed data equipment.
Wiring Diagram:
[GRAPHIC] [TIFF OMITTED] TC02JN91.078
[[Page 379]]
(3) Multiple bridged T/R; 8-position keyed data jack--Universal.
Electrical Network Connection: Multiple line bridged tip and ring.
Universal Service Order Code: RJ41M.
Mechanical Arrangement: Up to 8 miniature 8-position keyed jacks in
multiple mounting arrangement.
Typical Usage: Multiple installations of fixed loss loop or programmed
types of data equipment.
Wiring Diagram: Multiple arrangement of Sec. 68.502(e)(1).
(4) Multiple bridged T/R; 8-position keyed data jack--Programmed.
Electrical Network Connection: Multiple line bridged tip and ring.
Universal Service Order Code: RJ45M.
Mechanical Arrangement: Up to 8 miniature 8-position keyed jacks in
multiple mounting arrangement.
Typical Usage: Multiple installations of programmed types of data
equipment.
Wiring Diagram: Multiple arrangement of Sec. 68.502(e)(2).
(5) Bridged T/R; 50-position ribbon jack--Universal.
Electrical Network Connection: Single or multiple line bridged tip and
ring.
Universal Service Order Code: RJ26X.
Mechanical Arrangement: 50-position miniature ribbon jack.
Typical Usage: Universal jack for fixed loss loop (FLL) or programmed
(P) types of data equipment.
Wiring Diagram:
[GRAPHIC] [TIFF OMITTED] TC02JN91.079
------------------------------------------------------------------------
Position
-----------------------
Line FLL P
---------------- PR PC
T R T R
------------------------------------------------------------------------
1............................................... 26 1 27 2 28 3
2............................................... 29 4 30 5 31 6
3............................................... 32 7 33 8 34 9
4............................................... 35 10 36 11 37 12
5............................................... 38 13 39 14 40 15
6............................................... 41 16 42 17 43 18
7............................................... 44 19 45 20 46 21
8............................................... 47 22 48 23 49 24
------------------------------------------------------------------------
Note: At the time the jack is ordered, the customer shall specify the
number of and sequence of central office lines to be connected to the
jack. The telephone company will consecutively wire these lines to the
jack in accordance with the table above, without skipping any
positions.
(6) Bridged T/R; 50-position ribbon jack--Programmed.
Electrical Network Connection: Single or multiple line bridged tip and
ring.
Universal Service Order Code: RJ27X.
Mechanical Arrangement: 50-position miniature ribbon jack.
Typical Usage: Programmed jack for programmed (P) types of data
equipment.
Wiring Diagram:
[[Page 380]]
[GRAPHIC] [TIFF OMITTED] TC02JN91.080
------------------------------------------------------------------------
Position
---------------
Line P
-------- PR PC
T R
------------------------------------------------------------------------
1....................................................... 27 2 28 3
2....................................................... 30 5 31 6
3....................................................... 33 8 34 9
4....................................................... 36 11 37 12
5....................................................... 39 14 40 15
6....................................................... 42 17 43 18
7....................................................... 45 20 46 21
8....................................................... 48 23 49 24
------------------------------------------------------------------------
Note: At the time the jack is ordered, the customer shall specify the
number of and sequence of central office lines to be connected to the
jack. The telephone company will consecutively wire these lines to the
jack in accordance with the table above, without skipping any
positions.
(f) Multiple line series configurations--(1) Up to eight (8)
position jacks. Multiple series jacks in this category consist of
multiple arrangements of configurations specified in paragraph (b) of
this section, in a multiple mounting arrangement. Such multiple
arrangements may be ordered as a unit under the following:
Universal Service Order Code: RJ31M: Multiple series T/R ahead of all
station equipment (reference Sec. 68.502(b)(1)).
[41 1997 FR 28699 , July 12, 1976, as amended at 44 FR 7959 , Feb. 8, 1979; 46 FR 38516 , July 28, 1981; 50 FR 47549 , Nov. 19, 1985; 50 FR 49930 , Dec.
6, 1985; 51 FR 951 , Jan. 9, 1986]
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