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Part 68 and ringbacks

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~Subject: Part 68 and ringbacks
Organization: PANIX Public Access Unix, NYC
~Date: Sun, 21 Feb 1993 20:29:55 GMT
~Lines: 251

Someone posted a question to this group, namely how to find out
how to make the phone line ring back for testing newly installed
wiring.  I responded that the way to find out is to call your telco,
since under Part 68 they have to tell you.  (This is in the US only.)
I also acknowledged that many telcos play dumb and say they are not
aware they have to reveal the ringback number.

A number of readers have written to me since then asking where they
could find the regulation that requires this, and I assume it is so
they can show it to their local telco who is playing dumb.

So here it is, in case it may be helpful.

If you are like me you will read the section hoping to find a place
where it says "the telco has to tell you how to do ringback".  Those
words do not appear.  Instead, the section talks about contacting
the telco to see if it is available.   A telco that wants to be a
jerk will say, yes it is available, but not to non-telco employees,
thus they do not have to tell you.  That's the wrong answer.  What
the section means is if their switch does not have the feature at all,
then they don't have to tell you since there is no such number.
But if there is such a feature and they make it available to their
own installers, they have to make it available to you.

  Title 47--Telecommunication; Revised as of October 1, 1991


  Subpart C--Registration Procedures

  Sec. 68.213 Installation of other than "fully protected"
non-system premises wiring.

  47 CFR 68.213

  (a) Scope of this rule.  Provisions of this rule are limited to
"unprotected" premises wiring used with simple installations of
wiring for one and two-line residential and business telephone
service.  More complex installations of wiring for multiple line
services, for use with systems such as PBX and key telephone
systems, are controlled by sec. 68.215 of these rules.

(b) Wiring authorized.  "Unprotected" premises wiring (wiring
which is not located electrically behind apparatus which protects
against hazardous voltages and imbalance) may be used to connect
units of terminal equipment or protective circuitry to one
another, and to the network interface (or demarcation point), if
installed in accordance with these rules.  Subsequent relocation
of a demarcation point may be arranged, either at the
subscriber's request or on the serving telephone company's
initiative, but the serving telephone company shall not
discriminate in its treatment of demarcation point location, or
relocation.  Responsibility for the protector (and its associated
grounding) on the network side of the demarcation point rests
with the telephone company, though the subscriber is responsible

for consequences resulting from erroneous wiring procedures
conducted under his or her direction.  Responsiblity for wiring
on the subscriber's side of the demarcation point (including any
protector that maybe installed as part of the premises wiring)
purchased inplace or wholly or partially new, rests with the
owner (or subsequent owner) of the wiring.

  (c) Material requirements.  Conductors shall have insulation
with a 1500 Volt rms breakdown rating.  This rating shall be
established by covering the jacket or sheath with at least six
inches (measured lineraly on the cable) of conductive foil, and
establishing a potential difference between the foil and all of
the individual conductors connected together, such potential
difference gradually increased over a 30 second time period to
1500 Volts rms, 60 Hertz, then applied continuously for one
minute.  At no time during this 90 second timeinterval shall the
current between these points exceed 10 milliamperes peak.

  (d) Attestation.  Manufacturers (or distributors or retailers,
whichever name appears on the packaging) of non-system telephone
premises wire shall attest in a letter to the Commission that the
wire conforms with Part 68, FCC Rules.

  (e) Notice to the telephone company.  Subscribers performing
installation, connection, disconnection, reconfiguration or
removal of premises wiring to or from the telephone network
shall, upon request of the telephone company, inform the
telephone company of:

  (1) The responsible subscriber's telephone number(s).

  (2) A description of the location of the jack to which the
premises wiring isto be connected.

  (3) A statement that all applicable rules, building codes and
electrical codes will be complied with.

  (4) The wire manufacturer, or brand name, and model number, if
any, of the wire used.

  (f) Acceptance testing.  Non-system premises wiring installed
in accordance with these rules shall be tested under the
acceptance tests specified in this subsection whenever an
operation associated with any installation, reconfiguration or
removal of wiring (other than final removal) is performed.
Atelephone which responds to ringing shall be used to perform the
tests when the CPE connected or to be connected to the premises
wiring does not itself provide ringing.

  (1) Dial tone testing.  A telephone connected with the line(s)
shall be used to perform this test in the following order:

  (i) Lift the handset of the telephone to create the off-hook
state on the line under test.

  (ii) Listen for noise.  Confirm that there is neither audible
hum nor excessive noise.

  (iii) Listen for dial tone.  Confirm that dial tone is present.

  (iv) Break the dial tone by dialing a digit.  Confirm that dial
tone is broken as a result of dialing the digit.

(v) With dial tone broken, listen for audible hum or excessive
noise, which could indicate a faulty connection.  Confirm that
there is neither audible hum nor excessive noise.

  (2) "Ringback" testing.  A telephone connected to the
subscriber's line(s) shall be used as follows:

  (i) Either make a "ringback" call if the service is available
(contact the local telephone company to determine the
availability of and procedure for utilizing such ringback
service) or have another person dial the number of theline being

  (ii) Permit the telephone to ring for one minute (usually
twelve rings).

  (iii) Lift the handset off the telephone for five seconds or
longer, as necessary.

  (iv) Hang up.  Check return of normal dial tone.

  (3) Failure of acceptance tests.  Absence of dial tone before
dialing or inability to break dial tone during either test
indicates failure of premises wiring.  Failure to receive ringing
during the "ringback" testing may indicate failure either of the
wiring or of the ringer in the telephone; if necessary,
substitute a telephone which is known to be operating to
determine which is at fault.  Upon any failure, the failing
equipment or portion of the premises wiring shall be
disconnnected from the telephone network, and may not be
reconnected until the cause of the failure has been isolated and
removed.  Any previously tested line(s) shall be retested if it
was in any way involved inthe isolation and removal of the cause
of the failure.

  (g) Extraordinary procedures.  The local telephone company is
hereby authorized to limit the subscriber's right of connecting
one and two-line non-system premises wiring.

  (1) Conditions which may invoke these procedures.  The
extraordinary procedures authorized herein may only be invoked
where one or more of the following conditions is present:

  (i) Information provided by the subscriber gives reason to
believe that a violation of Part 68 of the FCC's rules is likely.

  (ii) A failure has occurred during acceptance testing.

  (iii) Harm has occurred, and there is reason to believe that
this harm was a result of wiring operations performed under this

The extraordinary procedures authorized in the following
subsections shall not be used so as to discriminate between
installations by local telephone company personnel and
installations by others.  In general, this would require that any
charges for these procedures be levied in accordance with, or
analogous to, the "maintenance of service" tariff provisions: if
the installation proves satisfactory, no charge should be levied.

  (2) Monitoring or participation in acceptance testing.  Notwithstanding
the pr
evious subsection, the local telephone
company may monitor or participate in acceptance testing at the
time of the initial installation of wiring in the absence of the
conditions listed therein; at any other time, one or more of the
listed conditions shall be present.  Such monitoring or
participation in acceptance testing should be performed from the
central office test desk where possible to minimize costs.

  (3) Inspection.  Subject to paragraph (g)(1) of this section,
the local telephone company may inspect wiring installed pursuant
to this section.  To minimize disruption of the premises
communications system, we are limiting theright of inspecting
wiring as follows:

  (i) During initial installation of wiring: The telephone
company may require withdrawal of up to 5 percent (measured
linearly) of wiring run concealed in ducts, conduit or wall
spaces, to determine conformance of the wiring to the information
furnished by the subscriber.

  (ii) After failure of acceptance testing or after harm has
resulted from installed wiring: The telephone company may require
withdrawal of all wiring runconcealed in ducts, conduit or wall
spaces which reasonably could have caused the failure or harm, to
determine conformance of the wiring to the information provided
by the subscriber.

  (4) Requiring the use of protective apparatus.  In the event
that any of the conditions listed in paragraph (g)(1) of this
section, arises, and is not permanently remedied within a
reasonable period, the telephone company may require the use of
protective apparatus which protects against hazardous voltages.
Such apparatus may be furnished either by the telephone company
or bythe subscriber.  This right is in addition to the telephone
company's rights under sec. 68.108.

  (5) Notice of the right to bring a complaint.  In any case
where the telephonecompany invokes the extraordinary procedures
of sec. 68.213(g), it shall afford thesubscriber the opportunity
to correct the situation which gave rise to invoking these
procedures, and inform the subscriber of the right to bring a
complaint to the Commission pursuant to the procedures set forth
in Subpart E ofthis part.  On complaint, the Commission reserves
the right to perform any of the inspections authorized under this
section, and to require the performance ofacceptance tests.

  SOURCE: 49 FR 21734, May 23, 1984, as amended at 50 FR 29392,
July 19, 1985; 50 FR 47548, Nov.  19, 1985; 51 FR 944, Jan.  9,

  AUTHORITY: Secs.  4, 201, 202, 203, 204, 205, 208, 215, 218,
226, 313, 314, 403, 404, 410, 602, 48 Stat.  as amended, 1066,
1070, 1071, 1072, 1073, 1076, 1077, 1087, 1094, 1098, 1102; 47
U.S.C.  154, 201, 202, 203, 204, 205, 208, 215, 218, 226, 313,
314, 403, 404, 410, 602, unless otherwise noted.

0068 00190

Carl Oppedahl AA2KW  (intellectual property lawyer)
30 Rockefeller Plaza
New York, NY  10112-0228
voice 212-408-2578     fax 212-765-2519

call your local telco today!

(we ain't afraid of no NOC)