System and method for realizing wide-area centrex

A wide-area, intelligent technology, applied in the field of communication, can solve problems such as the complexity of end office models, and achieve the effect of convenient management capabilities
CN1984355AInactive Publication Date: 2007-06-20HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
HUAWEI TECH CO LTD
Publication Date
2007-06-20
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The method thereof comprises: preparing a substrate; forming a catalyst metal layer on the substrate in order to accelerate the growth of carbon nanometer tube; forming an amorphous carbon layer for partly overlapping said catalyst metal layer; growing a carbon nanometer tube on the surface of a portion of catalyst metal layer un-overlapped by the amorphous carbon layer. The invention is used to grow carbon nanometer tube in low temperature in order to reduce production cost.
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Description

technical field

[0001] The invention relates to the field of communication technology, in particular to a system and method for realizing a wide-area Centrex by using a smart home location register (SHLR). Background technique

[0002] Generally speaking, the concept of a Centrex group only exists in the intra-office. If intra-office users belong to the same Centrex group, they can dial short numbers to achieve intercommunication. If a Centrex group consists of users from different exchanges, a wide-area Centrex (WAC) group is formed. This makes the Centrex group users no geographical restrictions, and users of the same Centrex group in different offices can communicate with each other through the Centrex short number. It provides convenience for users such as institutions, groups, factories and mines with scattered office locations.

[0003] Currently, there are generally two ways to implement WAN Centrex: one is to convert short numbers into called long numbers by configu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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