| 摘要 |
Adjunct apparatus for increasing network transmission capacity provides a lo w-cost, efficient solution for increasing the network transmission capacity of the e xisting telephone circuit switched network, while keeping the current network equipm ent unchanged. A Local Switch Network (LSN) Adjunct (LSNA) and a Tandem/Toll Swi tch Network (TSN) Adjunct (TSNA) interface with standard network elements, such as switches and cross connect equipment. These network adjuncts, comprising a s et of low-bit rate speech coders, a dynamic timeslot manager and other supporting function s, advantageously transmit to and receive from a T1/T3/OC3/E1 trunk. More than one channel of voice is carried on one 64 Kbps DS0 timeslot, while still maintai ning the voice at toll quality. A sub-timeslot and sub-timeslot bundling are introduced in the standard T1 or E1 frame where each sub-timeslot is analogous to a single bit of the typi cal eight bit word to provide more than 24 or 30 voice channels respectively. Inband contr ol information is generated for carrying over a T1 or E1 trunk, for example, fo r mapping sub-timeslot bundles to channels. Conventional out-of-band signaling is prov ided via SS-7 or other out-of-band signaling system.
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