(a) The expenses related to central office equipment are summarized in the following accounts:
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Central Office Switching Expense | Account 6210.
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Operator Systems Expense | Account 6220.
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Central Office Transmission Expense | Account 6230. |
(b) The expenses in these accounts are apportioned among the operations on the basis of the separation of the investments in central office equipment—Accounts 2210, 2220 and 2230, combined.
[52 FR 17229, May 6, 1987, as amended at 69 FR 12552, Mar. 17, 2004; 83 FR 63586, Dec. 11, 2018]