Sec. 36.123  Operator systems equipment--Category 1.

    (a) Operator systems equipment is contained in Account 2220. It 
includes all types of manual telephone switchboards except tandem 
switchboards and those used solely for recording of calling telephone 
numbers in connection with customer dialed charge traffic. It includes 
all face equipment, terminating relay circuits of trunk and toll line 
circuits, cord circuits, cable turning sections, subscriber line 
equipment, associated toll connecting trunk equipment, number checking 
facilities, ticket distributing systems, calculagraphs, chief operator 
and other desks, operator chairs, and other such equipment.
    (1) Operator systems equipment is generally classified according to 
operating arrangements of which the following are typical:

(i) Separate toll boards
(ii) Separate local manual boards
(iii) Combined local manual and toll boards
(iv) Combined toll and DSA boards
(v) Separate DSA and DSB boards
(vi) Service observing boards
(vii) Auxiliary service boards

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(viii) Traffic service positions

    (2) If switchboards as set forth in Sec. 36.123(a) are of the key 
pulsing type, the cost of the key pulsing senders, link and trunk finder 
equipment is included with the switchboards.
    (3) DSB boards include the associated DSB dial equipment, such as 
link and sender equipment.
    (4) Traffic service position systems include the common control and 
trunk equipment in addition to the associated groups of positions 
wherever located.
    (b) The cost of the following operator systems equipment is 
apportioned among the operations on the basis of the relative number of 
weighted standard work seconds handled at the switchboards under 
consideration.
    (1) The following types of switchboards at toll centers are 
generally apportioned individually:
    (i) Separate toll boards. These usually include outward, through and 
inward positions in separate lines and associated inward toll 
switchboard positions in line.
    (ii) Switchboards handling both local and toll, either combined or 
having segregated local and toll positions in the same line.
    (iii) Switchboards handling both toll and DSA, either combined or 
having segregated toll and DSA positions in the same line.
    (iv) Traffic service positions, including separately located groups 
of these positions when associated with a common basic control unit.
    (2) The following types of switchboards at toll centers are 
apportioned individually, or by groups of comparable types of boards for 
each exchange:
    (i) Separate local manual boards. This includes the local positions 
of manual boards where inward toll positions are in the same line.
    (ii) Separate DSA boards.
    (iii) Separate DSB boards.
    (3) Tributary boards may be treated individually if warranted or 
they may be treated on a group basis.
    (c) Auxiliary service boards generally handle rate and route, 
information, and intercept service at individual or joint positions. The 
cost of these boards is apportioned as follows:
    (1) The cost of separate directory assistance boards is apportioned 
among the operations on the basis of the relative number of weighted 
standard work seconds handled at the boards under consideration. 
Directory assistance weighted standard work seconds are apportioned 
among the operations on the basis of the classification of these 
weighted standard work seconds as follows:
    (i) Directory assistance weighted standard work seconds first are 
classified between calls received over toll directory assistance trunks 
from operators or customers and all other directory assistance calls.
    (ii) The directory assistance weighted standard work seconds of each 
type further are classified separately among the operations on the basis 
of an analysis of a representative sample of directory assistance calls 
of each type with reference to the locations of the calling and called 
stations for each call.
    (2) The cost of separate intercept boards and automated intercept 
systems in the study area is appportioned among the operations on the 
basis of the relative number of subscriber line minutes of use.
    (3) The cost of separate rate and route boards is generally included 
with the cost of the toll boards served and is apportioned with those 
boards.
    (4) Where more than one auxiliary service is handled at an auxiliary 
board, the cost of the board is apportioned among the auxiliary services 
on the basis of the relative number of weighted standard work seconds 
for each service. The cost of that part of the board allocated to each 
auxiliary service is apportioned among the operations in the same manner 
as for a separate auxiliary board.
    (d) The cost of joint exchange and toll service observing boards is 
first apportioned between exchange and toll use on the basis of the 
relative number of exchange and toll service observing units at these 
boards. The cost of separate toll service observing boards and the toll 
portion of joint service observing boards is apportioned between state 
and interstate operations on the basis of the relative number of toll 
minutes

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of use associated with the toll messages originating in the offices 
observed.
    (e) Traffic Service Position System (TSPS) investments are 
apportioned as follows:
    (1) Operator position investments are apportioned on the basis of 
the relative weighted standard work seconds for the entire TSPS complex.
    (2) Remote trunk arrangement (RTA) investments are apportioned on 
the basis of the relative processor real time (i.e., actual seconds) 
required to process TSPS traffic originating from the end offices served 
by each RTA.
    (3) The remaining investments at the central control location, such 
as the stored program control and memory, is apportioned on the basis of 
the relative processor real time (i.e., actual seconds) for the entire 
TSPS complex.