Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent
1993-11-02
1995-03-28
Dwyer, James L.
Telephonic communications
Plural exchange network or interconnection
Interexchange signalling
379229, 379230, 379290, 3701101, H04M 700, H04J 312
Patent
active
054024790
ABSTRACT:
An office interface unit (OIU) transfers data and signaling between a telephone local exchange and distribution lines. Information from the telephone local exchange is contained in repetitive frames containing signaling time slots which each contain two distinct nibbles of information. The OIU translates each local exchange signaling channel into first and second internal signaling channels, each internal signaling channel containing information representative of one signaling nibble therein. This simplifies DSO time slot interchange in the OIU. In addition, each internal signaling channel is provided with at least one additional significant signaling bit thereby providing additional signaling states so that the OIU equipment can account for multiple types of telephone local exchange equipment easily. Furthermore, each internal signaling channel is also provided with at least one data coding check bit thereby providing an easy and efficient method of determining whether or not bit errors are occurring in the OIU or equipment connected thereto.
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Proceedings IEEE International Conference on Communications, vol. 2, 22 Jun. 1986, Toronto (Canada), pp. 1105-1110; Billhardt et al., "A survey of the remote switching capabilities of the 5ESS switch"(Y).
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Mischa Schwartz, Telecommunication Networks=Protocols, Modeling and Analysis, Addison-Wesley Publishing Company, pp. 534-539.
Ellersick William F.
Saneski Steven P.
Burkard Herbert G.
Dwyer James L.
Raynet Corporation
Tsang Fan
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