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EP0822696A2
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Data logging system employing M(N+1) redundancy
Assignee: Nice Systems Ltd
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Filing: 1997-07-29
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Granted: —
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Expires: 2017-07-29
Abstract
Abstract A novel logging system employing M[N + 1] redundancy is disclosed having applications in recording both voice and facsimile transactions. The logging system includes M chains of N + 1 loggers. Each N + 1 chain includes N working loggers and a single spare logger. Within each chain. each working logger is coupled to a switch unit. Each switch unit is coupled between a group of input telephone lines and one working logger. The switch units are coupled to each other in a serial daisy chain fashion. The switch furthest downstream is coupled to a spare logger which is activated in the event one the working loggers fails. The switches include watchdog circuitry to detect the failure of a working logger. Once detected, the telephone lines coupled to the failed logger are rerouted to the spare logger. The system can support any number of working loggers by sectioning the working loggers into separate chains. Each chain includes a group of N working loggers covered by a single spare logger. The working loggers and the spare logger are managed by a controller which is coupled thereto via a local area network (LAN). The switch includes a plurality of 2 X 2 crossover switches which perform the actual switching function in the event a failure is detected in one of the working loggers. Each input telephone line is associated with one 2 X 2 crossover switch.
Inventors
- 👤 Ilan Yosef
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 18:21
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00002; H04N1/00007; H04N1/0001; H04B; H04B1/00; H04B1/74; H04M; H04M3/00; H04M3/22; H04M3/36; H04M3/42; H04M3/42221; H04N1/00026; H04N1/00042; H04N1/00058
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
204 words
A data logging system employing redundancy for recording transmissions
occurring over a plurality of input telephone lines, said data logging system
characterized by comprising: a. N switch units, each switch unit coupled to a portion of said plurality of
input telephone lines, each switch unit having an unswitched state and a
switched state, said N switch units coupled together in a daisy chain
fashion resulting in a furthest upstream switch unit and a furthest
downstream switch unit: b. N working loggers, each working logger coupled to one of said N switch
units, each said working logger recording transmissions occurring over its
portion of said plurality of input telephone lines on a recording subsystem
coupled thereto while its associated switch unit is said unswitched state; c. a spare logger coupled to said furthest downstream switch unit; and d. a controller coupled to said N working loggers and said spare logger, said
controller for managing and administering said data logging system; wherein each said switch unit for detecting a failure in an associated working
logger, upon detection of said failure said switch unit entering said switched state
whereby transmissions occurring over its portion of said plurality of input
telephone lines are redirected to said spare logger.
Claim 2
Dependent Claim
29 words
The data logging system according to claim 1, wherein during said failure of said
working logger, said transmissions are recorded on said spare logger without
interruption to said recording.
Claim 3
Dependent Claim
236 words
A data logging system employing M[N + 1] redundancy for recording
transmissions occurring over a plurality of input telephone lines, said data
logging system comprising: a. M chains: each chain comprising: i. N switch units, each switch unit coupled to a portion of said
plurality of input telephone lines, each switch unit having an
unswitched state and a switched state, said plurality of switch
units coupled together in a daisy chain fashion resulting in a
furthest upstream switch unit and a furthest downstream switch
unit; ii. N working loggers, each working logger coupled to one of said N
switch units, each said working logger recording transmissions
occurring over its portion of said plurality of input telephone lines
on a recording subsystem coupled thereto while its associated
switch unit is in said unswitched state; and iii. a spare logger coupled to said furthest downstream switch unit; wherein each said switch unit for detecting a failure in its associated
working logger, upon detection of said failure said switch unit entering
said switched state whereby transmissions occurring over its portion of
said plurality of input telephone lines are redirected to said spare logger;
and b. a controller coupled, within each said chain, to said N working loggers
and said spare logger, said controller for managing and administering said
data logging system; and wherein the total number of working loggers across said M chains is equal to M
X N.
Claim 4
Dependent Claim
217 words
An M[N + 1] data logging system employing M chains, each chain having N
working loggers each and one spare logger, said data logging system for
recording transmissions occurring over a plurality of input telephone lines, said
data logging system comprising: a. M chains; each chain comprising: i. N switch units, each switch unit coupled to a portion of said
plurality of input telephone lines and one of said N working
loggers, each switch unit having an unswitched state and a
switched state, said N switch units coupled together in a daisy
chain fashion resulting in a furthest upstream switch unit and a
furthest downstream switch unit, said furthest downstream switch
unit coupled to said spare logger, said coupled working logger
recording transmissions occurring over said portion of said
plurality of input telephone lines while said switch unit is in said
unswitched state; and wherein each said switch unit for detecting a failure in its associated
working logger, upon detection of said failure said switch unit entering
said switched state whereby transmissions occurring over its portion of
said plurality of input telephone lines are redirected to said spare logger;
and b. a controller coupled, within each said chain, to said N working loggers
and said spare logger, said controller for managing and administering said
data logging system.
Claim 5
Dependent Claim
98 words
The data logging system according any of claims 1, 3 and 4, wherein said switch
unit comprises a plurality of crossover switches, each said crossover switch
associated with one of said input telephone lines, said crossover switch having a
first and second input, a first and second output, said first input coupled to said
first output and said second input coupled to said second output while said switch
is in said unswitched state, said first input coupled to said second output and said
second input coupled to said first output while said switch is in said switched
state.
Claim 6
Dependent Claim
30 words
The data logging system according to any of claims 1, 3 and 4, wherein each said
switch unit comprises watchdog circuitry for detecting the failure of its
associated working logger.
Claim 7
Dependent Claim
47 words
The data logging system according to any of claims 1 and 3, wherein during a
replacement of a faulty logger with a replacement working logger, said spare
logger stops recording and said replacement working logger automatically begins
recording said transmission without any interruptions occurring to said recording.
Claim 8
Dependent Claim
25 words
The data logging system according to any of claims 1 and 3, wherein said spare
logger automatically identifies a failed logger utilizing a logger ID.
Claim 9
Dependent Claim
42 words
The data logging system according to any of claims 1 and 3, wherein said
controller automatically sets up said system having knowledge for each said
working logger, its logger ID and chain ID and for each said spare logger, its
chain ID.
Claim 10
Dependent Claim
32 words
The data logging system according to any of claims 1 and 3, wherein in the event
of a double fault, the working logger closest to said spare logger will be backed
up.
Claim 11
Independent Claim
212 words
A method of constructing a data logging system employing redundancy for
recording transmissions occurring over a plurality of input telephone lines, said
method comprising the steps of: a. providing N switch units; b. coupling each switch unit to a portion of said plurality of input telephone
lines, each switch unit having an unswitched state and a switched state; c. coupling said N switch units together in a daisy chain fashion resulting in
a furthest upstream switch unit and a furthest downstream switch unit; d. providing N working loggers; e. coupling each working logger to one of said N switch units, each said
working logger recording transmissions occurring over its portion of said
plurality of input telephone lines on a recording subsystem coupled
thereto while its associated switch unit is said unswitched state; f. coupling a spare logger to said furthest downstream switch unit; g. coupling a controller to said N working loggers and said spare logger,
said controller for managing and administering said data logging system;
and h. detecting a failure, by said switch unit, in an associated working logger
and upon detection of said failure said switch unit entering said switched
state whereby transmissions occurring over its portion of said plurality of
input telephone lines are redirected to said spare logger.
References Cited (Backward Citations)
No citation records indexed.
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