Multiplex communications – Wide area network – Packet switching
Patent
1996-03-12
1999-08-03
Lim, Krisna
Multiplex communications
Wide area network
Packet switching
370395, 370468, G06F 1300, H04J 316
Patent
active
059336072
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a communication system, protocol and method designed to facilitate information transfer including user and control information from CBR (Continuous Bit Rate) and/or non-CBR signal sources. Such a system, for example is a CSS (Customer Switching System), a LAN network, a Key System, LAN hub, PABX or PBX.
The words "system" or "communication system" throughout this document encompasses CSS, LAN, network, Key System, Hub, PABX, PBX, or other relatively localised data, voice, and/or video apparatus or medium.
PRIOR ART
Prior art communication systems have difficulty in carrying CBR and non-CBR signals in the one system without degradation to one type of signal and generally suffer from at least one of the following perceived disadvantages: simultaneous access, the higher address gets priority. This does not enable fair access by lower addressed sources, range of services, including some CBR, real-time services,
In relation to "staggering", other problems may exist in prior art communication systems in respect of end to end delay of CBR channels, a significant component of which is caused by cell access delay.
Prior art systems which use fixed-length packet techniques to transport CBR signals may suffer increased end to end delay when all CBR sources are in phase with each other. Cell access delay is longest when cells are generated in phase and the problem is most prevalent in the absence of non-CBR sources. This results in relatively high packet access delay. Thus, even though the average bandwidth of the system may be sufficient, instantaneous shortfalls can result in access delays, which delays may be nearly as large as the packetisation delay.
Prior art systems presently address this problem by providing surplus system bandwidth or by providing partial filling of cells (also requiring extra unusable bandwidth). This is considered to be inefficient and undesirable as it impacts on system performance and cost.
Particularly in relation to "channel aggregation", a problem also is perceived to exist where a number of bit streams are placed onto a first interface of a communication system e.g. a TDM based L1/N1 interface. The bit streams can emerge from a second system interface with a relative delay between separate streams. Currently expensive adaptor equipment is required in addition to the system to cater for such bit streams.
In relation to system reliability and serviceability, a problem has been identified in prior art architectures used in a number of communication systems. The problem identified is in the area of system maintenance and/or reliability, and in particular the probability of complete system failure caused as a result of a part of the system failing.
Consideration of the cost effective provision of services in a communication system tend to inhibit the adoption of auxiliary communication `back-up` system(s). System down time may be even further prolonged while the cause of the system failure is located, isolated and repaired.
OBJECT
An object of the present invention is to alleviate at least one of the disadvantages noted above in providing a system, protocol and/or method which facilitates the trafficking of CBR and/or non-CBR.
SUMMARY OF INVENTION
A number of aspects are disclosed in this specification. These include: trafficking of CBR, non-CBR, or a combination thereof, an ATM-HP which serves as an interface for non-CBR to the architecture, adaptor equipment,
An example of CBR is voice, video and `non-bursty` data.
An example of non-CBR or `bursty` data is LAN data.
One problem addressed by the present invention is the development of system technology which provides flexible and cost-effective support of a wide range of services (e.g. constant bit rate (CBR) such as voice, and non-CBR such as LAN data, etc.) applicable to business customers now and in the future.
The "now" services were the traditional ones which have to be supported as cost-effectively as possible. These are classified as Basic Mandatory services--voice and d
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Gorog Peter Alexander Ernest
Heinze Garry Colin
Mikelaitis Peter Ian
Palmer Robert
Shahbaz Mourad Christopher Manoug
Lim Krisna
Telstra Corporation Limited
Vu Viet
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