GB1329900A - Telecommunications systems - Google Patents

Telecommunications systems

Info

Publication number
GB1329900A
GB1329900A GB4050471A GB4050471A GB1329900A GB 1329900 A GB1329900 A GB 1329900A GB 4050471 A GB4050471 A GB 4050471A GB 4050471 A GB4050471 A GB 4050471A GB 1329900 A GB1329900 A GB 1329900A
Authority
GB
United Kingdom
Prior art keywords
pilot
channel
receiver
switching
channels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4050471A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19702043973 external-priority patent/DE2043973C/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1329900A publication Critical patent/GB1329900A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/74—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for increasing reliability, e.g. using redundant or spare channels or apparatus

Abstract

1329900 Transmission systems SIEMENS AG 31 Aug 1971 [4 Sept 1970] 40504/71 Heading H4R In a transmission system having a normally operational channel and a standby channel with automatic switching of a receiver from the normal to the standby channel in the event of a fault in the normal channel, a pilot tone is fed into both channels at the transmit end and two pilot receivers are provided at the receive end with a switching system which connects one or other of the pilot receivers to the output of the switching device which effects the switching between the normal and the standby channels, while the other pilot receiver is connected to whichever of the channels is at that time the operational channel. Fig. 1 shows a terminal station with a transmitting equipment for a channel 1 and receiving equipment for a channel 2, similar equipment being provided at the other terminal station for the other direction of transmission. At the transmitter data signals from source 11 are fed through a pilot frequency rejection filter 12 to the two channels A and B, with a pilot signal of 300 Hz from generator 15 being added in each channel. At the receiver the switch S1 selects the signals on line A or line B, according to its position, to feed, via a pilot rejection filter, to receiver 25. In addition switches S2, S3 and S4 connect the output of switch S1 and the output of whichever of the channels is not at that time selected by switch S1, to pilot tone receivers P A and P B via pilot selection filters 27, 28, the switching being such that each pilot receiver is always associated with a particular channel, whether it is in use or not. A switching logic 31 provides switching signals to the switches S1 to S4 only when the channel to which the receiver is connected has no pilot signal above a predetermined level, at the same time as the pilot receiver connected to the other channel is responding. In addition lamps 321 and 322 are energized by non-response of the corresponding pilot receiver.
GB4050471A 1970-09-04 1971-08-31 Telecommunications systems Expired GB1329900A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702043973 DE2043973C (en) 1970-09-04 Device for automatically switching a receiving device from a disturbed to a further night transmission channel

Publications (1)

Publication Number Publication Date
GB1329900A true GB1329900A (en) 1973-09-12

Family

ID=5781618

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4050471A Expired GB1329900A (en) 1970-09-04 1971-08-31 Telecommunications systems

Country Status (5)

Country Link
JP (1) JPS5123403B1 (en)
BE (1) BE772173A (en)
GB (1) GB1329900A (en)
NL (1) NL155147B (en)
SE (1) SE376344B (en)

Also Published As

Publication number Publication date
JPS5123403B1 (en) 1976-07-16
NL7111916A (en) 1972-03-07
BE772173A (en) 1972-03-03
DE2043973A1 (en) 1972-03-09
SE376344B (en) 1975-05-12
NL155147B (en) 1977-11-15
DE2043973B2 (en) 1972-10-12

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee