During a telephone or other connection an exchange stores information about charges to be made for that connection. To provide flexible charging the exchange responds to a charge variation request signal to transmit to a party by whom a proposed charge is to be borne a signal requiring acknowledgement and to modify a respective portion of the store contents relating to said connection in progress only if such an acknowledgement is received, so as to vary the charging arrangements, for example to...

A distributing frame, for telecommunications systems, comprises an upright hollow member, on the front of which are mounted a number of shelf members, spaced vertically, one above the other. Modules, containing connectors are mounted on the fronts of the shelf members, usually in pairs, a pair on each shelf member, the modules side-by-side. Further modules are mounted on the back of the hollow member, again usually in vertically spaced pairs. Access to the modules is provided from the interior o...

A cable splice formed by wrapping an electrical connection in sealing tape and injection molding an encapsulation on the connection. The sealing tape is formed of material (e.g. ethylene propylene rubber) which softens under the influence of the injection molding temperature, and is shaped intimately into fluid-tight sealing contact with the electrical connection by shrinkage of the encapsulation during cooling. The material of the sealing tape is also heat insulating to resist increase in tempe...

A satellite telecommunications system having peripheral stations and a central station which communicate with each other via a satellite. The central station transmits a reference frequency to the peripheral stations via the satellite. The central station receives the reference frequency, determines the frequency drift and transmits a controlling signal to the satellite. The reference frequency transmitted by the satellite is controlled by the controlling signal so as to be stable in time.

In an entrance terminal for a telephone cable, each terminal has an integral cable conductor trough at one side, generally closed by a cover. End walls in the troughs have apertures therein the apertures breaking through the edges of the end walls of the troughs, forming gaps of a width less than the diameter of the apertures. Sleeves extend through the appertures in adjacent end walls of adjacent terminals. By axially sliding a sleeve upward, out of the apertures, it is possible to remove a ter...

An optical telecommunications cable comprising an outer tube of circular cross-section made of aluminum covered with a plastics material and a plurality of strands of circular cross-section inside the outer tube, the strands being assembled tangentially to one another and each of the strands being constituted by an elementary circular structure covered by a tubular covering made of plastic material and reinforced by three strength members disposed at 120.degree. in the covering. The elementary c...

An improved telephone system selector unit employing an electronic control arrangement is capable of directly replacing or being added on to existing electro-mechanical switching arrangements of the Strowger or other types which position themselves directly in response to subscriber dial pulses. The electronic circuitry establishes rapid outlet scanning via a matrix of twelve-pole relays, each of which permits selection of three four-wire lines or four three-wire lines, depending upon a pre-sele...

A radio system for automated ship board operation includes a plurality of radio receivers and a plurality of radio transmitters. The system includes an ARQ unit, with which one of the receivers and one of the transmitters is associated. A DSELCALL unit is provided, with which another one of the receivers and another one of the transmitters is associated. A VDT unit is provide upon which radio information and messages can be displayed upon reception and composed for transmission. The system inclu...

An electrical terminating arrangement (100) serving as an interconnection juncture for joining central office equipment with outside plant facilities, an access point for testing and a protection provisioning point comprises connector apparatus (402), tie cabling (500) and protector apparatus (110) wherein the conventional stand-alone test field appearance is eliminated. Test access is provided directly through sockets (130) in front face (113) of protector apparatus (110), or indirectly to test...

A method and apparatus to apply pulp to a telecommunications conductor with an adhesive which is formed from acrylic resin solution. The solution is applied in a bath and is passed between wiping rolls with the feed speed of the conductor and the differential speed between the peripheral surfaces of the wiping rolls and the conductor being controlled together with the contact angle between the conductor and the rolls. This control results in a dried thickness of resin of no greater than 0.00015 ...