Adapter for Connecting a Multipoint Modem Network to the Public Switched Network
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
In the multipoint modem network shown in Fig. 1, the host computer communicates on leased lines L1a and L1b with several remote Data Terminal Equipments (DTEs) through the intermediary of a primary modem CTL at one end and tributary modems T1, T2 and T3 at the other end arranged in a multipoint configuration. If one of the links to the tributary modems fails, such as the connection with T3 indicated by a cross in Fig. 1, a solution is to connect modem T3 directly on the public switched network by lines L2a and L2b. On the host computer side, the best way is to use a special modem MSP which is connected between the switched network and the host computer.