Sec. 61.38  Supporting information to be submitted with letters of 
          transmittal.

    (a) Scope. This section applies to dominant carriers whose gross 
annual revenue exceed $500,000 for the most recent 12 month period of 
operations or are estimated to exceed $500,000 for a representative 12 
month period. Local exchange carriers serving 50,000 or fewer access 
lines in a given study area that are described as subset 3 carriers in 
Sec. 69.602 of this chapter may submit Access Tariff filings for that 
study area pursuant to either this section or Sec. 61.39. However, the 
Commission may require any carrier to submit such information as may be 
necessary for a review of a tariff filing. This section (other than the 
preceding sentence of this paragraph) shall not apply to tariff filings 
proposing rates for services identified in Sec. 61.42 (a), (b), (d), 
(e), and (g), promotional offerings that relate to services subject to 
price cap regulation, tariff filings proposing rates for services 
identified in Sec. 61.50, or to tariff filings, other than promotional 
filings, filed on 14 days' notice pursuant to Sec. 61.58(c)(6).
    (b) Explanation and data supporting either changes or new tariff 
offerings. The material to be submitted for a tariff change which 
affects rates or charges or for a tariff offering a new service, must 
include an explanation of the changed or new matter, the reasons for

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the filing, the basis of ratemaking employed, and economic information 
to support the changed or new matter.
    (1) For a tariff change the carrier must submit the following, 
including complete explanations of the bases for the estimates.
    (i) A cost of service study for all elements for the most recent 12 
month period;
    (ii) A study containing a projection of costs for a representative 
12 month period;
    (iii) Estimates of the effect of the changed matter on the traffic 
and revenues from the service to which the changed matter applies, the 
carrier's other service classifications, and the carrier's overall 
traffic and revenues. These estimates must include the projected effects 
on the traffic and revenues for the same representative 12 month period 
used in (ii) above.
    (2) For a tariff filing offering a new service, the carrier must 
submit the following, including complete explanations of the bases for 
the estimates.
    (i) A study containing a projection of costs for a representative 12 
month period; and
    (ii) Estimates of the effect of the new matter on the traffic and 
revenues from the service to which the new matter applies, the carrier's 
other service classifications, and the carrier's overall traffic and 
revenues. These estimates must include the projected effects on the 
traffic and revenues for the same representative 12 month period used in 
paragraph (b)(2)(i) of this section.
    (3) For a tariff filing that introduces or changes a contribution 
charge for special access and expanded interconnection, as defined in 
Sec. 69.122 of this chapter, the carrier must submit information 
sufficient to establish that the charge has been calculated in a manner 
that complies with the Commission order authorizing the contribution 
charge.
    (4) For a tariff that introduces a system of density pricing zones, 
as described in Sec. 69.123 of this chapter, the carrier must, before 
filing its tariff, submit a density pricing zone plan including, inter 
alia, documentation sufficient to establish that the system of zones 
reasonably reflects cost-related characteristics, such as the density of 
total interstate traffic in central offices located in the respective 
zones, and receive approval of its proposed plan.
    (c) Working papers and statistical data. (1) Concurrently with the 
filing of any tariff change or tariff filing for a service not 
previously offered, the Chief, Tariff Review Branch must be provided two 
sets of working papers containing the information underlying the data 
supplied in response to paragraph (b) of this section, and a clear 
explanation of how the working papers relate to that information.
    (2) All statistical studies must be submitted and supported in the 
form prescribed in Sec. 1.363 of the Commission's Rules.
    (d) Form and content of additional material to be submitted with 
certain rate increases. In the circumstances set out in paragraphs 
(d)(1) and (2) of this section, the filing carrier must submit all 
additional cost, marketing and other data underlying the working papers 
to justify a proposed rate increase. The carrier must submit this 
information in suitable form to serve as the carrier's direct case in 
the event the rate increase is set by the Commission for investigation.
    (1) Rate increases affecting single services or tariffed items.
    (i) A rate increase in any service or tariffed item which results in 
more than $1 million in additional annual revenues, calculated on the 
basis of existing quantities in service, without regard to the 
percentage increase in such revenues; or
    (ii) A single rate increase in any service or tariffed item, or 
successive rate increases in the same service or tariffed item within a 
12 month period, either of which results in:
    (A) At least a 10 percent increase in annual revenues from that 
service or tariffed item, and
    (B) At least $100,000 in additional annual revenues, both calculated 
on the basis of existing quantities in service.
    (2) Rate increases affecting more than one service or tariffed item.
    (i) A general rate increase in more than one service or tariffed 
item occurring at one time, which results in more than $1 million in 
additional revenues

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calculated on the basis of existing quantities in service, without 
regard to the percentage increase in such revenues; or
    (ii) A general rate increase in more than one service or tariffed 
item occurring at one time, or successive general rate increases in the 
same services or tariffed items occurring within a 12 month period, 
either of which results in:
    (A) At least a 10 percent increase in annual revenues from those 
services or tariffed items, and
    (B) At least $100,000 in additional annual revenues, both calculated 
on the basis of existing quantities in service.
    (e) Submission of explanation and data by connecting carriers. If 
the changed or new matter is being filed by the issuing carrier at the 
request of a connecting carrier, the connecting carrier must provide the 
data required by paragraphs (b) and (c) of this section on the date the 
issuing carrier files the tariff matter with the Commission.
    (f) Copies of explanation and data to customers. Concurrently with 
the filing of any rate for special construction (or special assembly 
equipment and arrangements) developed on the basis of estimated costs, 
the offering carrier must transmit to the customer a copy of the 
explanation and data required by paragraphs (b) and (c) of this section.

[ 49 FR 40869 , Oct. 18, 1984, as amended at  53 FR 36289 , Sept. 19, 1988; 
 54 FR 19841 , May 8, 1989;  55 FR 42382 , Oct. 19, 1990;  56 FR 55239 , Oct. 
25, 1991;  57 FR 54330 , Nov. 18, 1992;  58 FR 36147 , July 6, 1993;  58 FR 48762 , Sept. 17, 1993]