Apparatus for utilizing spare E1 channels

Details Apparatus for utilizing spare E1 channels Apparatus for utilizing spare E1 channels

2000-01-03

2003-06-24

Ton, Dang (Department: 2661)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

Reexamination Certificate

active

06584123

ABSTRACT:

BACKGROUND
The present invention relates generally to E
1
timeslots which go unused when T
1
payloads are transported on E
1
frames. More particularly, the present invention relates to an apparatus which enables a customer to transport data utilizing up to 7 channels which frequently go unused when 24 channels of unframed T
1
data are transported utilizing 24 of the 32 channels available through E
1
.
In Europe, the most popular standard for transmitting digital voice data is known as E
1
. E
1
was devised by the International Telecommunications Union-Telecommunication Standardization Sector (ITU-T). The name E
1
was given by the Conference of European Postal and Telecommunication Administration (CEPT). In accordance with the E
1
standard, 32 standardized 64 Kbps channels (also referred to herein as “timeslots”) carry digital data at a rate of 2.048 Mbps. In the United States, the most popular standard for transmitting digital voice data is known as T
1
. T
1
was introduced by the Bell System in the 1960's. In accordance with the T
1
standard, 24 standardized 64 Kbps channels carry digital data at a rate of 1.544 Mbps.
Frequently, customers in Europe wish to transport T
1
data to the United States. These customers typically provision E
1
service to their premises and transport the 24 channel T
1
payload to the United States utilizing 24 of the 32 E
1
channels provisioned to their premises. One of the 8 remaining E
1
channels is utilized for framing. Thus, up to 7 E
1
channels which might be utilized to transport data go unused when the European customer transports T
1
data utilizing E
1
.
In view of the above, it can be appreciated that there is a need for an apparatus which solves the above described problems.
SUMMARY OF THE INVENTION
The present invention provides an apparatus for multiplexing 24 channels of unframed T
1
data onto an E
1
frame. According to one embodiment of the present invention, a multiplexer receives 24 64 Kbps channels of unframed T
1
data at one interface and up to 7 64 Kbps channels of additional data at a second interface. The data received at these two interfaces is multiplexed into E
1
format and output at a third interface.


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