US2153528A - Broad band transmission system - Google Patents

Broad band transmission system Download PDF

Info

Publication number
US2153528A
US2153528A US203604A US20360438A US2153528A US 2153528 A US2153528 A US 2153528A US 203604 A US203604 A US 203604A US 20360438 A US20360438 A US 20360438A US 2153528 A US2153528 A US 2153528A
Authority
US
United States
Prior art keywords
repeater
gain
line
spare
amplifier
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 - Lifetime
Application number
US203604A
Other languages
English (en)
Inventor
Harvey H Benning
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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 to BE433887D priority Critical patent/BE433887A/xx
Priority to BE445505D priority patent/BE445505A/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US203604A priority patent/US2153528A/en
Application granted granted Critical
Publication of US2153528A publication Critical patent/US2153528A/en
Priority to FR853067D priority patent/FR853067A/fr
Priority to CH227863D priority patent/CH227863A/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/04—Cases; Covers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
    • H03F1/542—Replacing by standby devices

Definitions

  • Fig. 1 shows in simplified diagram a single 6 means whereby an active repeater may be rerepeater in service; placed without circuit disturbance.
  • Fig. 2 is a schematic of an active and a spare In a broad band transmission system it is the repeater in condition to be interchanged; practice to use a large number of repeaters
  • Fig. 3 shows a schematic of connection after spaced at rather close intervals.
  • these a spare repeater has been substituted for an acrepeaters transmit in one direction only, an additive repeater; and 10 tional circuit being provided for the transmis- Fig. 4 is a general layout of the arrangement sion in the opposite direction. With a large of apparatus for making repeater substitution.
  • Figs. 1, 2 and 3 transmission circuits are it is necessary to hold the amplification produced Shown by a single line for the sake of simplic l by any one repeater within very close limits.
  • a In Fig. 1 a repeater receives energy from line 15 satisfactory method of accomplishing this result fi s it and transmits t to line is provided by the pilot frequency regulator, Th
  • is shown connected across the pilot frequency may be any convenient frequency repeater at its output and it is presumed that Within the band of transmission of the system. under the conditions of normal operation the 20
  • the regulator may consist of a form of ampliregulator has set the gain of the repeater at a 20 tier-rectifier bridged across a repeater output.
  • spare repeaters which may be quickly substituted 4, however, it is assumed to have been decided for those in active service but due to the feature that repeater I should be removed from the line 45" of automatic gain control the spare repeaters will for inspection. Without removing patching cords ordinarily not immediately provide the proper IT and I8 the spare repeater circuit is set up. output level.
  • I provide a method is in multiple with jack 9 through the variable 5 for insuring against this contingency.
  • This disloss equalizer 5 thence through normally closed closure is based upon the presumption, which contacts of the quick-acting switch l9 back to is a matter of properly controlled design and jack [2 which is in multiple with jack l0, also .manufacture, that the amplification of all refrom jack I6 in multiple with jack l4 through peaters at maximum gain setting will be identinormally closed contacts of the quick-acting cal. switch and back to jack l5 which is in multiple 55 with jack I3.
  • the variable loss equalizer is a network which has been designed to have the same transmission frequency characteristic as the actual line and to be variable in attenuation upwards from zero.
  • variable loss equalizer has been set for zero attenuation.
  • the pad 6 is shown bridged across the strap between jacks I6 and I5. This is assumed to be a bridging pad whose impedance is so high as to cause no appreciable attenuation" or distortion when bridged across a transmission line such as that under consideration.
  • the patching cords I1 and I8 may be removed, so long as the quick-acting switch I9 is in the position shown, without any disturbance to" the line circuit.
  • Fig. 4 The conditionsshown in Fig. 4 are equivalent to those oi'Fig. 1 so far as line transmission is concerned.
  • Fig. 4 an auxiliary circuit which may be traced from the output of repeater I through pad 6, normally closed contacts of switch I9, and thence to the input of repeater Zwhich is equipped with regulator 4.
  • the output of repeater 2 is traced through normally closed contacts of switch I9 to network I.
  • the function of high impedance bridging pad 6 is two-fold. It not only picks pilot frequency off the line for transmission to the input of repeaterl but it also so attenuates the level of that pilot frequency that thepilot frequency levelafter aanplificationby repeater 2 isstill well below the levelwhich repeater 2 and regulator 4 are designed to maintain.
  • pilot voltmeter 21 may then be employed to check-the satisfactory operationof repeater 2.
  • repeaterl may be a regulator controlled repeater equivalent to repeater I or it may be any suitable repeater set to have a gain equivalent to the maximum gain of repeater I.
  • a transmission line a transmission line, a repeater having an input and an output connected in said line, a spare repeater, an automatic gain regulator for each'repeater adapted to be controlled in accordance with current on said line for adjusting the gain setting of said repeaters, means to connect the input of said spare repeater to receive highly attenuated currents from said" line, whereby its regulator is caused to adjust its gain to maximum setting, means for attenuating the current to said repeater in said line to cause its regulator to adjust its gain to maximum setting, and a switch for substituting said'spare repeater in place of saidrepeater in said line.
  • a transmission line an amplifier in said line, a spare amplifier arranged to receive input current from said line and having its output connected to a dummy load, means for adjusting said line amplifier to a predetermined gain above the normal gain of said line amplifier without change in net system gain means for adjusting said spare amplifier to said predetermined gain, and a multicontact switch adapted to interchange respectively the inputs of said amplifiers and simultaneously to interchange respectively the outputs of said amplifiers.
  • replacement means for an active amplifier comprising in combination an equivalent spare amplifier, means for causing said active amplifier to cancel its normal operating margin so as to adjust its gain to maximum while maintaining constant system gain, auxiliary means causing said spare amplifier to regulate its gain intoequivalence with said active amplifier, and a quick-acting switch adapted to substitute said spare amplifier for said active amplifier.
  • replacement means for an active amplifier comprising in combination an equivalent spare amplifier, means including a variable attenuator for causing said active amplifier to adjust its gain to a maximum while maintaining constant system gain, auxiliary means including an input loss pad and a terminating network causing said spare amplifier to regulate its gain into equivalence with said active amplifier, and a quick-acting switch adapted to interchange said amplifiers.
  • replacement means for an active amplifier comprising a similar spare amplifier, means for causing said active amplifier to adjust its gain to a predetermined level, means for causing said spare amplifier to adjust its gain to a level equal to that of said active amplifier, and a hand operated switch for interchanging said amplifiers.
  • placement means for an active amplifier comprising a similar spare amplifier, means for causing said active amplifier to increase its gain to a predetermined level without change in system level, independent means causing said spare amplifier to adjust its gain to equivalence with said active amplifier, and a quick-acting switch for interchanging said amplifiers.
  • replacement means for an active amplifier comprising a spare amplifier of identical design, hand operated means for increasing the system attenuation preceding said active amplifier whereby it is caused to increase its gain to maximum without change in the transmission equivalent of the said system, input means causing said spare amplifier to adjust its gain to maximum, and a switch adapted to quickly interchange the input and the output connections respectively of said amplifiers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
US203604A 1938-04-22 1938-04-22 Broad band transmission system Expired - Lifetime US2153528A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE433887D BE433887A (en:Method) 1938-04-22
BE445505D BE445505A (en:Method) 1938-04-22
US203604A US2153528A (en) 1938-04-22 1938-04-22 Broad band transmission system
FR853067D FR853067A (fr) 1938-04-22 1939-04-13 Circuits de transmission de signaux électriques
CH227863D CH227863A (de) 1938-04-22 1942-05-06 Installationsschalter.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US203604A US2153528A (en) 1938-04-22 1938-04-22 Broad band transmission system

Publications (1)

Publication Number Publication Date
US2153528A true US2153528A (en) 1939-04-04

Family

ID=22754627

Family Applications (1)

Application Number Title Priority Date Filing Date
US203604A Expired - Lifetime US2153528A (en) 1938-04-22 1938-04-22 Broad band transmission system

Country Status (4)

Country Link
US (1) US2153528A (en:Method)
BE (2) BE445505A (en:Method)
CH (1) CH227863A (en:Method)
FR (1) FR853067A (en:Method)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3163809A (en) * 1961-01-10 1964-12-29 Ling Temco Vought Inc Random noise system for vibration testing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3163809A (en) * 1961-01-10 1964-12-29 Ling Temco Vought Inc Random noise system for vibration testing

Also Published As

Publication number Publication date
CH227863A (de) 1943-07-15
BE445505A (en:Method)
FR853067A (fr) 1940-03-09
BE433887A (en:Method)

Similar Documents

Publication Publication Date Title
US2153528A (en) Broad band transmission system
US2164344A (en) Signal transmission system
US2611833A (en) Electric amplifier with negative feedback
US2231542A (en) Transmission control circuit
US2867774A (en) Gain regulator for carrier systems
US1956547A (en) Repeatered transmission system
US2111607A (en) Repeatered line system
Chesnut et al. Cable carrier telephone terminals
US2267286A (en) Negative feedback amplifier
US2033963A (en) Wave translating system
US2115141A (en) Transmission regulating system
US1937796A (en) Attenuating and selecting circuts
US1956715A (en) Correction for changes in line transmission
US1849141A (en) Transmission regulator system
US2170046A (en) Negative feedback amplifier
US1895542A (en) Pilot channel indicating system
US2231527A (en) Transmission regulation
US2362348A (en) Transmission monitoring system
US2326871A (en) Gain control
Black et al. An improved cable carrier system
US2500424A (en) Negative feedback amplifier
US2382588A (en) Gain control circuits for carrier systems
US1979101A (en) Transmission system
US2411415A (en) Telecommunication system
US1900106A (en) Bridging connection for program circuits