A “Milliwatt (102 Type) Test Line” is a signal generated from an end office which provides a 1004 Hz tone at 0 dBm0 for one-way transmission measurements towards the customer’s location from the Access Service Provider end office.
Milliwatt test tones are often found at NPA-NXX-0010.
Numbers which have been reported to us as milliwatt test lines include:
(206)345-0020
(425)226-0020
(670)234-0102
(781)382-5555
(800)485-9076
(877)250-0600
(909)390-0002
(914)372-9988
If you know of a functioning milliwatt test line, please add it in the comments.
When I was a kid (1960′s), every exchange in my area (Wash DC) + 9949 gave a steady tone – probably the milliwatt test tone. 9947 gave an oscillating tone similar to a slow police siren. What exactly were these tones used to test?
Dave