词条 | Plant test number |
释义 |
In landline telephony, a plant test number or exchange is a number or group of numbers reserved for use by telephone installers to perform routine tests on an individual telephone line. These include, but are not limited to:
Each country uses different codes. BT Linetest Facilities (for example) are available by ringing 17070[3] and a self-service test facility for subscribers is no longer available.[4] In the North American Numbering Plan, 958-xxxx and +1-NPA-959-xxxx are commonly reserved for local and long-distance test numbers (respectively). A few localities (including Winnipeg) reserve 959 only.[5] References1. ^http://www.artofhacking.com/tucops/phreak/callerid/live/aoh_anac.htm 2. ^http://home.ptd.net/~n3cvj/looplines.htm 3. ^http://www.howtofixanything.co.uk/howto-btlinetestfacility.html 4. ^http://www.redcare.bt.com/PDF/Installations_Support/Self%20Service%20Line%20Test%20V1.pdf 5. ^Plant test exchange prefixes appear in the list of CO Code assignments (per area code) at http://nanpa.com (US) and http://cnac.ca (Canada) but the individual numbers are unpublished by design, as they're intended for installers only. 2 : Telephone numbers|Communication circuits |
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