Telephone utilities shall furnish and maintain properly designed plant facilities to provide satisfactory circuit transmission of communications between customers. Circuit transmission shall have adequate volume levels and be free of excessive distortion. Levels of noise and crosstalk shall be such as not to impair communications. The circuit transmission objectives set forth herein are based upon the use of standard telephone (500 type) sets connected to a 48-52 full float volt direct current supply. The minimum transmission objectives are as follows:
1,000 HZ loss: -8.5db or less.
Loop circuit: not less than 20 ma.
Circuit noise: 30db rnc or less.
CKT balance: 50db or greater.
Subscriber loops shall have a loop resistance not exceeding the supervision limit of the associated central office equipment, unless equipped with appropriate supervision extending devices to ensure that proper network control signaling and transmission is provided.
Toll | EAS | ||
1,000 HZ loss Circuit noise | -6.0db +/- 1.7db 30dbrnc or less | -3.Odb +/- 1.7db 30dbrnc or less |
Telephone utilities shall have as an objective the provision of full service selective ringing for all telecommunications service.
Ala. Admin. Code r. 770-X-5-.21
Author: Alabama Public Service Commission
Statutory Authority:Code of Ala. 1975, §§ 37-1-52, 37-1-54, 37-1-57, 37-1-82, 37-2-3, 37-2-9.