KR970705324A - Multi-nodal digital telephone distribution system - Google Patents

Abstract

The CDS (Cabin Distribution System) provides the necessary interface between each telephone unit used by passengers in the aircraft and the Cabin Telephony Unit (CTU). CTU is an intelligent telephone switch that controls and directs telephone calls between passengers and multiple communication networks. The basic reality interface, such as the CEPT E1 interface, is used to connect multiple phone units to a loop-based structure. The E1 interface provides 32 communication channels. In addition, the link access protocol for the D-channel is utilized to control communications on the Ei interface. Utilizing the LAP-D protocol among the 32 channels available on the E1 interface, the first channel is used to frame the communication message and the 16th channel, referred to as the D-channel, is utilized as the data communication channel. Advantageously, the remaining 30 channels, referred to as B-channels, are used to connect telephone calls. The data information transmitted on the D-channel is interrupted by each telephone group for a delay of 16 frames to determine if the data is intended for the group. The voice information transmitted along the B-channel is interrupted for one frame by each group to determine if the data is intended for the group. By preventing the telephone group from interrupting the transmission for the B-channel for an extended period of time, unnecessary delays in voice communication are eliminated.

Description

Multi-nodal digital telephone distribution system

Since this is a trivial issue, I did not include the contents of the text.

1 is a block diagram of a telephone distribution system of a preferred embodiment;

Figure 2 is a block diagram of a cabin phone unit connected to a zone telephone box (ZTB) connected to a number of seat telephone boxes (STB).

Figure 3 is a block diagram of a layer of communication protocols for the D-channel.

FIG. 4 is a block diagram of the STB circuit.

FIG. 5 is a block diagram of an STM circuit.

Claims (10)

A telephone communication system comprising: a main telephone switching device; A plurality of telephone control units; A telephone unit connected to a call of the telephone control unit; A data link connecting the telephone control unit to the main telephone switching system and including at least one data channel and a plurality of voice channels; Connected to said data link for determining whether said at least one data channel and said at least one voice channel have been received by said telephone control unit and for transmitting said at least one data channel And a detection circuit for delaying the transmission of the transmission signal. The telephone communication system according to claim 1, wherein the telephone control unit is connected to the main telephone switching device in a daisy chain connection. The telephony system of claim 1, further comprising a plurality of transmitters / receivers connected to the main telephone switching device to establish a connection to a bearer system. 2. The system of claim 1, wherein the data link is an E1 interface. CLAIMS 1. A method of operating a telephone unit connected to a multi-channel communication cable comprising at least one data channel and a plurality of voice channels, the method comprising: receiving a request to connect the telephone unit to one of a plurality of voice channels Passing said at least one data channel for monitoring; And transmitting the plurality of voice channels via the telephone unit having a minimum delay during the delaying step. Comprising: a main telephone switching device; a plurality of telephone control units each connected to at least one telephone unit; and a data link comprising a plurality of voice channels and at least one data channel connecting said telephone control unit to said telephone switching device A method for controlling dial-up in an aircraft telephony system, the method comprising: transmitting control data from the main telephone switching device on the at least one data channel of the data link to a first telephone control unit; Intercepting the control data on the data channel in each of the telephone control units; Decoding at each telephone control unit to determine whether the control data is to be directed to the telephone control unit while watering the control data; Transmitting the unintended control data to the waterproof telephone control unit to a continuous telephone control unit on the data channel; Transmitting control data from the last telephone control unit to the main telephone switching device on the data channel; Assigning one of said voice channels to one of said telephone control units for telephone call processing; And transmitting voice information received by a unit of the telephone control unit to the telephone switching device on the designated voice channel. 7. The method of claim 6, wherein the plurality of telephone units and the main telephone switching device are connected via the data link in a daisy chain. 7. The dial-up control method according to claim 6, further comprising processing the control data directed to the waterproof telephone control unit in the waterproof control unit. 9. The method according to claim 8, wherein a connection is established between the main telephone switching device and an external delivery system. A multi-nodal digital telephone distribution system comprising: a multi-channel communication cable including at least one data channel and a plurality of voice channels; A plurality of telephone control units each connected to said multi-channel communication cable via a transmitter / receiver device; And a medium access control software program in communication with the transmitter / receiver device on each of the telephone control units to mediate access of the telephone control unit for data channels on the multi-channel communication cable. Digital telephone distribution system. ※ Note: It is disclosed by the contents of the first application.