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Relay interface device based on synchronous digital transmission system

A technology for synchronizing digital and interface devices. It is applied in the directions of digital transmission systems, synchronization devices, and transmission systems. It can solve the problems of inaccessibility, easy signal interference, and poor quality of long-distance voice transmission, so as to improve the quality and The effect of saving the cost of the initial renovation

Inactive Publication Date: 2006-03-29
ZTE CORP
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantage that the existing E / M interface equipment cannot be accessed when the communication network is upgraded to digital transmission, and to solve the problems of poor quality of long-distance voice transmission and easy interference of signaling existing in the prior art

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  • Relay interface device based on synchronous digital transmission system
  • Relay interface device based on synchronous digital transmission system
  • Relay interface device based on synchronous digital transmission system

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Embodiment Construction

[0018] The principle block diagram of device of the present invention is as figure 1 shown, including:

[0019] Core control circuit 1: The MC68360 communication processor is the main control center, and communicates with the network management computer through the Ethernet interface circuit; the 8031 ​​series single-chip microcomputer system is used as the executor of specific tasks, responsible for specific control of each module inside the device;

[0020] Clock synchronization circuit 2: use T7688 interface circuit to extract 2.048MHz clock from standard E1 interface, generate 32.768MHz initial clock after frequency multiplication and PLL smoothing, and then generate 16.384MHz and 8.192MHz clocks after frequency division , and frame header signals of 122nS and 61nS width. The frame header signal of the 16.384MHz clock and 61nS width is sent to the time slot interleaving circuit 4, and the frame header signal of the 8.192MHz clock and 122nS width is sent to the PCM codec a...

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Abstract

A relay interface device base on a synchronous digit transmission system relates to E / M relay interface including a core control circuit, a clock synchronous circuit a synchronous lead-in process circuit, a time-slot cross circuit, an audio interface circuit, PCM code / decode and time-slot distribution circuit, a sending circuit of M signaling and a receiving circuit of E signaling. The original E / M analog relay interface equipments can be still used in synchronous data transferring network system with this invented devices, so as to save the initial reform expenses and increase quality voice and signaling.

Description

technical field [0001] The invention relates to an E / M relay interface of a Synchronous Digital Hierarchy (SDH), in particular to an interface of a program-controlled exchange E / M relay and an E / M carrier relay in a private network. Background technique [0002] The E / M interface of the switch is an analog interface, which is mainly used for inter-office interconnection between switches, and has been widely used in the era of crossbar switch communication. Compared with the digital trunk interface, the voice transmission quality of the E / M trunk interface is poor, especially in the long-distance transmission, and the sending and receiving of signaling is relatively easy to be interfered. The distance device appears to be necessary. With the increasing promotion of SDH synchronous transmission network and the popularization of program-controlled digital switches, the analog interface between switches—solid line / carrier relay is gradually replaced by digital photoelectric int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/66H04L7/00
Inventor 刘友义熊杰杜广
Owner ZTE CORP
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