| 摘要 |
An apparatus (40) and method for switching a customer-premises telephone li ne (36) between a plurality of local telephone networks (35). The local telepho ne networks may have different electrical and operational characteristics. Usin g less than 100 micro-amperes of current from the telephone networks, the apparatus (40) requires no external power and performs its tasks without interfering with the normal operation of the telephone networks including test equipment, termina l equipment, data transmission on the telephone line and test equipment. The method involves monitoring electrical signals on both local telephone networ ks (35) and using this information to assign a weight to each network. The customer- premises telephone line (36) is switched to the telephone network having the highest weight. The advantages are the elimination of a service call by a technician to manually switch the customer premises telephone line (36), equ al access by both service providers to the switch and a seamless interface to t he telephone networks.
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