US 6,154,523 AGranted

Method and system for linking a toll switch

AssigneeAT&T Corp.

InventorsRobert J. Hofmann, Douglas W. Jones, Karl T. Koppany, Michael J. Lutz

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Abstract

A system and method for connecting a voice band link box to a telephone switch to facilitate trunk-related testing. The system includes a remotable trunk transmission unit being interconnected to the telephone switch and interfacing with the testing device, a voice band link box having an input interface being interconnected to the remotable trunk transmission unit and an output interface being interconnected to a digital trunk of the telephone switch, and an output device being interconnected to the telephone switch. The testing device interfaces with the remotable trunk transmission unit and places a call by transmitting an analog signal via the remotable trunk transmission unit directed to the output device. The voice band link box receives the analog signal at its input interface, converts the analog signal to a digital signal and routes the digital signal from the output interface over the digital trunk of the telephone switch. The call is received at the output device.

Claims5

Dependent claims

A method for performing a test on a telephone switch by a testing device, comprising:

transmitting a predetermined code corresponding to the telephone switch from the testing device to a switching network, wherein the switching network interfaces the testing device to a first digital trunk of the telephone switch;
seizing an incoming channel of the first digital trunk at a voice band link box;
seizing an outgoing channel of a second digital trunk of the telephone switch at the voice band link box;
placing a call from the testing device directed to a customer site;
routing the call from the telephone switch to the voice band link box over the seized incoming channel and back to the telephone switch from the voice band link box over the seized outgoing channel;
and
routing the call from the telephone switch to the customer site, wherein seizing the outgoing channel further comprises:
the outgoing channel providing a wink-start signal to a loopback port of the voice band link box;
and
the loopback port transmitting the wink-start signal to the testing device, and
wherein placing the call further comprises:
the loopback port of the voice band link box receiving an off-hook signal;
copying data from the incoming channel to the outgoing channel;
transmitting the data to the telephone switch;
receiving a wink-start signal from the telephone switch;
and
sending a confirmation tone to the incoming channel.

14 more elements

A system for performing a test on a telephone switch by a testing device, comprising:

a switching network in communication with a first digital trunk of the telephone switch;
a voice band link box having an input interface and an output interface, the input interface being interconnected to the first digital trunk of the telephone switch, and the output interface being interconnected to a second digital trunk of the telephone switch, the input interface being interconnected to the output interface by a loopback port;
and
a customer site in communication with the second digital trunk of the telephone switch;
wherein the testing device is configured to transmit a predetermined code corresponding to the telephone switch to the switching network and to place a call directed to the customer site;
wherein the switching network is configured to interface the testing device to the first digital trunk of the telephone switch;
wherein the loopback port of the voice band link box is configured to seize an incoming channel of the first digital trunk, seize an outgoing channel of the second digital trunk and route the call from the telephone switch over the seized incoming channel and back to the telephone switch over the seized outgoing channel;
and
wherein the telephone switch is configured to route the call from the seized outgoing channel to the customer site.

6 more elements

Dependencies are inferred from the claim text.