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Browse Prior Art Database

Low Cost Implementation of a Control Channel for Multi-Channel Networks

IP.com Disclosure Number: IPCOM000104375D
Original Publication Date: 1993-Apr-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Liu, K: AUTHOR

Abstract

Disclosed is a technique for implementing a common control channel for multi-wavelength multi-access networks which does not require a separate transmitter. As applications arise that require gbits/s per user, data networks must support terabits/s, preferably by using multiple channels rather than aggregating all the data together into a common channel. The most popular way of realizing these multi-channel multiple-access networks in high speed optical transmission is to use wavelength-division multiple-access. In this class of architectures, laser transmitters send on well-defined and distinct wavelengths while receivers selectively receive on well-defined and distinct wavelengths. To change the connection, either the transmitter or receiver much change wavelengths.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Low Cost Implementation of a Control Channel for Multi-Channel Networks

      Disclosed is a technique for implementing a common control
channel for multi-wavelength multi-access networks which does not
require a separate transmitter.  As applications arise that require
gbits/s per user, data networks must support terabits/s, preferably
by using multiple channels rather than aggregating all the data
together into a common channel.  The most popular way of realizing
these multi-channel multiple-access networks in high speed optical
transmission is to use wavelength-division multiple-access.  In this
class of architectures, laser transmitters send on well-defined and
distinct wavelengths while receivers  selectively receive on
well-defined and distinct wavelengths.  To change the connection,
either the transmitter or receiver much change wavelengths.  An
additional control channel is typically needed to initiate this
change since the receivers are blind to all but the original channel.
Control channels which require added tunability transmitters extra
transmitters extra wavelength selective receivers are not attractive
since  the cost of the hardware for the control channel becomes
comparable to the cost of the data channels.

      An underlying assumption in terabit/s networks is that the
amount of data to be transferred is generally large or such a network
would not be necessary.  The amount of control information, by
comparison, is small.  This invention rests on the recognition that
the control channel can be at much lower speed than the data
channels.  High speed digital data is usually encoded to minimize low
frequency content to ensure accurate thresholding. ...