A telecommunications FIFO provides an interface between two serial data transmission channels which have independent clocks and which can operate according to different protocols. The FIFO contains two storage registers each equal to a frame of data in length. Data is written into and read from alternate storage registers with the transfer between one register and the other occurring upon the receipt of write and read frame sync pulses respectively. At the receipt of each write frame sync pulse ...

Telecommunications connector having a modular jack with a plug chamber open at one end of the body, and conductive lines with terminals projecting into the chamber and plate terminals projecting from the other end of the body. A dielectric retainer holds the plate terminals in position. In a practical arrangement, the retainer has walls and a base with the modular jack mounted between the walls and engaging the base. The conductive lines extend between the modular jack and a wall of the retainer...

Telecommunications conductor having a dielectric housing, a conductive blade member extending from the housing for insertion into an insulation displacement terminal of a terminal array and a latch extending from the housing for mounting the connector on a terminal member which carries the array. A positive latch operating device is employed to flex the latch into a latching position from which it is resiliently urged into a normal unlatched position. Preferably, these are two opposed latches an...

A communication procedure suitable for a cordless telephone system involves time division duplex radio communication between a handset 11 and a base station 3 using alternating bursts of transmission over a single radio channel. Once a radio link has been set up, initial transmissions carry a synchronization logical channel S and a signalling logical channel D multiple together, bu the link may switch to bursts carrying a communications logical channel B for the speech data and the signalling lo...

A telecommunications outlet includes an outlet housing and a telecommunications module assembly. The outlet housing includes an opening into which a complementary mating telecommunications plug can be inserted from the front of the housing. The telecommunications module assembly includes a telecommunications module mounted on a printed circuit board. Guide tracks project rearwardly from the outlet housing for slidably engaging opposite edges of the printed circuit board for guiding the module as...

A security node disposed in the telecommunications network connecting calling and called parties transforms information (which can be voice, data, facsimile, video and other types of calls or messages) encrypted in a first format to (a) encrypted information in a different format or to (b) non-encrypted information, and vice-versa. The node is accessible from any location connected to the network. By routing calls or messages originated by the calling party and destined for the called party via ...

High frequency cable with short twist lays with the insulation thickness of conductors being different from that of others, the thickness of insulation being dependent upon twist lay length so as to achieve a desired characteristic impedance and signal attenuation.

In a telecommunications system such as a global mobile telephone network in which each subscriber unit includes a Subscriber Identity Module (SIM card), each SIM card has fixed memory locations, to which data can be addressed over the air. Some of the locations can not be overwritten from the subscriber unit but can be accessed therefrom on the entry of short simple codes, each associated with one of the locations. Further fixed memory locations can be read over the air only when the subscriber ...

A protocol analyzer for monitoring line control characters in a binary synchronous data telecommunications system comprising a control character trap means having a character decode means and character memory means to decode and buffer any of a plurality of predetermined line control characters and a visual display means to selectively observe the buffered control characters. The analyzer also includes an interface test means to monitor and display standard EIA RS-232 control lines and DAA contr...

A security node disposed in the telecommunications network connecting calling and called parties transforms information (which can be voice, data, facsimile, video and other types of calls or messages) encrypted in a first format to (a) encrypted information in a different format or to (b) non-encrypted information, and vice-versa. The node is accessible from any location connected to the network. By routing calls or messages originated by the calling party and destined for the called party via ...