Abstract

As communication networks have been progressed to B-ISDN, the importance of a customer premises networks has been recognized so much, and various CPN architectures were proposed. The hybridbus architecture, shown in Fig. 1, consists of two unidirectional buses operating at different bit-rates.¹ They are terminated at the broadband network terminations (BNT), which serves as a gateway between the B-ISDN and the CPN. The optical protection socket (OPS) improves the reliability of the upstream looped-bus. Namely, in the event of a terminal failures due to either electronic problems, power loss or disconnection, the associated OPS will automatically bypass the optical signal to the next BTA, thus preserving the continuity of the looped bus.²

© 1995 IEEE