Title of Invention	A METHOD OF COMMUNICATION IN DWDM SYSTEM
Abstract	The present invention relates to a DWDM-3240 system is Dense wavelength division multiplexing of optical transmission system. The present invention preferably relates to a method and system for communicating a given input signal by converting the signal into a predetermined colored DWDM wavelength, and apparatus thereof

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FIELD OF THE INVENTION The present invention relates to a DWDM-3240 system is Dense wavelength division multiplexing of optical transmission system. The present invention preferably relates to a method and system for communicating a given input signal by converting the signal into a predetermined colored DWDM wavelength, and apparatus thereof. BACKGROUND OF THE INVENTION The explosion in demand for network bandwidth is largely due to the growth in data traffic, specifically Internet Protocol (IP). Leading service providers report bandwidths doubling on their backbones about every six to nine months. This is largely in response to the 300 percent growth per year in Internet traffic, while traditional voice traffic grows at a compound annual rate of only about 13 percent. At the same time that network traffic volume is increasing, the nature of the traffic itself is becoming more complex. Traffic carried on a backbone can originate as circuit based (fDM voice and fax), packet based (IP), or cell based (ATM and Frame Relay). In addition, there is an increasing proportion of delay sensifive data, such as voice over IP and streaming video. In response to this explosive growth in bandwidth demand, along with the emergence of IP as the common foundation for all services, long-haul service providers are moving away from TDM based systems, which were optimized for voice but now prove to be costly and inefficient. Meanwhile, metropolitan networks are also experiencing the impact of growing congestion, as well as rapidly changing requirements that call for simpler and faster provisioning than is possible with older equipment and technologies. In this approach, many wavelengths are combined onto a single fiber. Using wavelength division multiplexing (WDM) technology several wavelengths, or light colors, can simultaneously mulfiplex signals of 2.5 to 40 Gbps each over a strand of fiber. Without having to lay new fiber, the effective capacity of existing fiber plant can routinely be increased by a factor of 16 or 40. Systems with 128 and 160 wavelengths are in operation today, with higher density on the horizon. The specific limits of this technology are not yet known. While Debate Continues as to Whether WDM or TDM is More Suitable for the [expansion of the Existing Fiber Network, it has become clear that Only Solutions, Which are Incorporating Both Technologies (as in WCC Card, which is doing TDM for Lower Data-rate) will Give Service Provider the Flexibility and Capacity for Future Requirements. These Requirements could, for Example Enable them to: • Maintain Different Dedicated Wavelengths for Different Customer • Lease Individual Wavelengths as Opposed to Entire Fibers • 1 Expand Portions of their Networks (for Example, where Multiple Rings Intersect Between Two Nodes) • Integrate Both Voice and Data Services into Different Transportation Frame before Lransporting Over a DWDM Channel The 32-channel Dense Wavelength Division Multiplexing (DWDM) Equipment for Channel Bit-rates upto STM-16 (2.5Gb/s)/OTU-l (2.7Gb/s) allows expanding the capacity of the Network without laying more Fibers. It can Multiplex 32 of STM-16 (2.5Gb/s)/OTU-l (2.7Gb/s) optical signals on a existing single mode (G.652) fiber, Thus increasing the carrying capacity of the single fiber from 2.5Gb/s to 80Gb/s. The DWDM-3240 Equipment conforms to International Telecommunication Union, fclecommunication Standardization Sector (ITU-T) Recommendations. The other Special features of this equipment include forward error correction (FEC), Mapping of 2 1 -Gigabit Ethernet signals onto one STM-16 stream, and Tunable transponder card within the specified C-Band (1530nm to 1565nm) of optical. The traditional fiber communication is point to point; a single wavelength transmission used a separate fibre. With the growing demand of bandwidth it is unable to meet the requirement. The DWDM-3240 is enabling service providers to accommodate consumer demand for ever-increasing amounts of bandwidth on a same single fibre. DWDM increases the capacity of embedded fibre by first assigning incoming optical signals to specific frequencies (wavelength, lambda) within a designated frequency band and then multiplexing the resulting signals out onto one fiber. Because incoming signals are never terminated in the optical layer, the interface can be bit-rate and format independent, allowing the service provider to integrate DWDM technology easily with existing equipment in the network while gaining access to the untapped capacity in the embedded fiber. Use of DWDM allows providers to offer services such as e-mail, video, and multimedia carried as Internet protocol (IP) data over asynchronous transfer mode (ATM) and voice carried over SONET/SDH. Despite the facts that these format—IP, ATM, and SONET/SDII provide unique bandwidth management capabilities; all three can be transported over the optical layer using DWDM. This unifying capability allows the service provider the flexibility to respond to customer demands over one network. OBJECTS OF THE INVENTION The primary object of the present invention is to provide a DWDM-3240 system which supports up to 40 wavelengths as per ITU-T Grid wavelengths. Yet another object of the present invention is to provide the DWDM -3240 system which is smoothly configured for transmission capacities ranging from 10 GB/s to 100 GB/s. Still another object of the present invention is to provide a system to support for short haul, long haul and very long haul applications. Still another object of the present invention is to provide an apparatus called as wavelength conversion card which takes different types of grey optical clients as input and maps them to a colored DWDM wavelength. Still another object of the present invention is to provide a method for communicating a given input signal by converting the signal into a predetermined colored DWDM wavelength. Another object of the present invention is an OTN framer/mapper device. Another object of the present invention is an GFP framer/mapper device STAlEMENT OF THE INVENTION Accordingly, the present invention provides for a method of communication in a DWDM system, said method comprising acts of; receiving plurality of grey optical client signals as input into a receiver; mapping the received signal onto plurality of known protocols and optionally forming virtually concatenation and thereafter multiplexing, mapping the multiplexed signal into colored DWDM wavelength on the transmitter path and thereby transmitting the mapped signal onto a colored DWDM channel towards DWD multiplexer card; and De-multiplexing and thereafter de-mapping the transmitted colored DWDM wavelength back into the grey client signals using wavelength conversion card and also provides ibr an OTN framer/mapper device comprising: a transmitting path module having East receive interlace to send electrical signal of input into east Gbl{ & I^'C monitor or ease SONET monitor block base on the signal format for checking for error and performance, East generator's to added overhead information to the corresponding monitored signal; and OCh generator to create OTU frame with FEC and thereafter sent to serializer device tor serializing and a receiving path module having OCh processor to check FEC for correction in received signal, West SONET monitor or west GbE & FC monitor for monitoring performance by reading overhead information, and West generator for regeneration of overhead information and providing it to west transmit interface; and also provides for an GFP framer/mapper device comprising: MAC block to create MAC Irame from electrical signal of input, GFP block to encapsulate MAC frame into GFP frame, VCAT block provides virtually concatenation by Filling multiple payload containers, and LTE bock to map VCAT information after Time division multiplexing onto STM-16 frame. BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS The invention is further described by means of example but not in any limitative sense with reference to the accompanying drawings of which: Figure 1 shows Application diagram of the DWDM Long-haul (LH). Figure 2 shows FEC Transponder Card. I'igure 3 shows GbE Muxponder Card. Figure 4 shows the optical wavelength conversion process. I'igure 5 shows internal block of the OTN framer/mapper device of the transponder card. Figure 6 shows internal block of the GFP framer/mapper device of the muxponder card. Figure 7 shows 'fhe Possible Client & Line Configurations for transponder. Figure 8 shows The Possible Client & Line Configurations for muxponder. DETAILED DESCRIPTION OF THE INVENTION In the foregoing specification, the invention has been described with reference to specific exemplary embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention as set forth in the appended claims. Accordingly, the specification and drawings are to be regarded in an illustrative rather than a restrictive sense. fhe primary embodiment of the present invention is a method of communication in a DWDM system, said method comprising acts of; a) receiving plurality of grey optical client signals as input into a receiver; b) mapping the received signal onto plurality of known protocols and optionally Ibrming virtually concatenation and thereafter multiplexing, c) mapping the multiplexed signal into colored IDWDM wavelength on the transmitter path and thereby transmitting the mapped signal onto a colored DWDM channel towards DWD multiplexer card; and d) De-multiplexing and thereafter de-mapping the transmitted colored DWDM wavelength back into the grey client signals using wavelength conversion card. In yet another embodiment of the present invention, the method maps the grey optical clients to the colored DWDM wavelength in C-Band centered around 193,lTHz frequency. In still another embodiment of the present invention, the mapping comprises acts of; a) monitoring the received signal for error and performance using overhead information based on the client protocol, and b) regenerating overhead information and generating Optical Transport Unit (OUT) frame with Forward Error Correction (FEC), In still another embodiment of the present invention, multiplexing while mapping without virtual concatenation for the STM-4 client signal. In still another embodiment of the present invention, converting the client signal into electrical signal and de-serializing it before mapping. In still another embodiment of the present invention, the method provides for optical wavelength in the DWDM grid as per ITU-T Rec. G.694.1. In still another embodiment of the present invention, the method provides for optical wavelength in the DWDM grid as per ffU-T Rec. G.709. In still another embodiment of the present invention, the method provides required transmission related alarms, performance for supported client and line optical signals, and other related transmission parameters. In still another embodiment of the present invention, the plurality of protocols arc selected from a group comprising STM-1, STM-4, STM-16, OC-3, OC-12, OC-48, lithernet. Fast Ethernet, Gigabit Ethernet, Fiber Channel and double Fiber Channel. Another embodiment of the present invention is an OTN framer/mapper device comprising: a transmitting path module having a) East receive interface to send electrical signal of input into east Gbli & FC monitor or ease SONE'f monitor block base on the signal format for checking for error and performance, b) East generator's to added overhead information to the corresponding monitored signal, and c) OCh generator to create OTIJ frame with FEC and thereafter sent to scrializer device for serializing. A receiving path module having a) OCh processor to check FEC for correction in received signal, b) West SONET monitor or west GbE & FC monitor for monitoring performance by reading overhead information, and c) West generator fbr regeneration of overhead information and providing it to west transmit interface. Another embodiment of the present invention is an GFP iramcr/mapper device comprising: a) MAC block to create MAC frame from electrical signal of input, b) (JFP block to encapsulate MAC frame into GFP frame, 7 c) VCAT block provides virtually concatenation by filling multiple payload containers, and d) LTE bock to map VCAT information after Time division multiplexing onto STM-16 frame. In still another embodiment of the present invention the input is selected from a group comprising STM-4, STM-16, and GbE. In still another embodiment of the present invention the output format is selected from a group comprising STM-4, sub-rate OTU/OTN with or without FEC, STM-16, OTU- l/CJfN with or without FEC, GbE and combinations thereof. In still another embodiment of the present invention the muxponder card takes at least 'two STM-4 or two GbE or one STM-4 and one GbE' as client input and maps them into SrN-16 output. A DWDM system for communicating a given input signal by converting the signal into a predetermined colored DWDM wavelength comprising an OTN framer/mapper device A DWDM system for communicating a given input signal by converting the signal into a predetermined colored DWDM wavelength comprising an OTN framer/mapper device. In still another embodiment of the present invention the system is configured for transmission capacifies ranging from lOGb/s to lOOGb/s. With the phenomenal growth in the demand for more and more Bandwidth, Telecom Operators world over are looking for options to increase the Bandwidth using the existing infrastructure (fiber) and are eager to protect the investments already made. Dense Wave Division Multiplexing technology is the latest development in the Telecom Transport Systems in the Optical Domain and answers most of the concerns of Operators. fhe DWDM-3240 system is a Dense Wavelength Division MuKiplexing of optical transmission system that supports up to 40 wavelengths as per FfU-T Grid wavelengths. . System can be smoothly configured as per Customer requirements for transmission capacities of lOGb/s, 20Gb/s, 40Gb/s and lOOGb/s. The system can be configured for short haul, Long haul & very long Haul applications. The DWDM-3240 system is a DWDM optical transmission system that supports up to 40 wavelengths and the maximum transmission capacity of up to 80Gb/s. The selection and separation of wavelengths is in strict compliance with the ITU-T Recommendations. The actual system configuration capacity can be selected flexibly according to customer's requirements, hence meeting requirements for transmission capacities of lOGb/s, 20Gb/s, and 40Gb/s and up to 80Gb/s. The system can also be equipped with Wavelength Line Amplifier so that the maximum non-relay transmission distance can be more than 640km. figure 1 shows Application diagram of the DWDM Long-haul (LH) with point-to-point topology, 'fhe LH equipment acquire 640 kms approximately route length before acquiring 3R regeneration. This is based on 0.28db/km loss over single mode fiber ITU-T G.652. Span loss between MPI-S & R', S' & MPl-R and S' & R' reference points for all spans is 22db or more. There could be 8 such spans or more with 80 kms each span. The U'fL DWDM-3240 optical transmission system is of two types, the integrated type and the open type. The integrated system can directly access the SDH equipment that satisfies the requirements for optical interfaces as suggested in the ffU-T G.692 Recommendation. This system is simple in structure and low in cost, 'fhe open system provides wavelength conversion function. Service providers can use it to expand relay distances and capacities of SDH transmission equipment of all vendors if the equipment satisfies the ITU-T G.957 Recommendation for optical interfaces. Therefore, the open system offers very good compatibility. The UTL DWDM-3240 optical transmission system has the independent Supervisory Channel & Order wire (OSCOW) to transmit the order wire and NH management information in the multiplex section and the regeneration section. The UTL DWDM-3240 optical transmission equipment provides powerful WDM NL management system. I'he system is powerful in management function and provides DWDM equipment and sub-networks with complete fault management, configuration management, performance management, safety management, and system management. The Wavelength Conversing Card takes Different Types of Grey Optical Clients (STM-4, SrM-16, GigE) as Input, and Maps them to a Colored DWDM Wavelength in the C-Band Centered around 193.1THz Frequency as per ITU-T Rec. G.694.1 Grid, at lOOGHz Channel Spacing. On the Transmit Path, before the Grey Client Signals are Mapped to Colored DWDM Wavelengths it can be First Mapped onto Different Protocols and as well Multiplexed, and then Put onto a 2.5Gb/s Colored DWDM Channel towards the DWDM Multiplexer Card. On the Receive Path the Colored DWDM Wavelength from the DWDM De-multiplexer Card is De-multiplexed and De-mapped back into Grey Client Signals by the WCC Card. The Card Provide Required Transmission Related Alarms, and Performances for all Supported Client and Line Optical Signals, and other Transmission Parameters. Based on the Required Client Signal Mapping & Multiplexing, there are Two Types of WCC Card been designed. Type I: FEC Transponder Figure 2 shows FEC Transponder Card. This transponder can map one STM-16 (2.5Gb/s) optical client stream to OTU-1 (2.7Gb/s) frame format and transport via an optical wavelength in the DWDM grid as per ITU-T Rec. G.694.1. The DWDM line signal is OTU-1 laDl (Intra-domain Interface) including FEC as per ITU-T Rec. G.709. The same card be configured for STM-4 (622Mb/s) and GigE (1.25Gb/s) optical client. Ihe STM-4 client will be mapped to Sub-rate OTU (666Mb/s) and transport via an optical wavelength in the DWDM grid. The GigE Client will be transported transparently over an optical wavelength in the DWDM grid. The STM-16 and STM-4 clients can also be regenerated and transmitted on the line side as STM-16 and STM-4 respectively. ■fhis Card Supports STM-4, STM-16, and GigE Grey Clients, and can Map them onto an OfU Frame as per ITU-T Rec. G.709, or Transparently Transmit them, after Performing 3R Functionality. This Signal is Further Mapped onto a Colored DWDM Wavelength and Transmitted towards the Mux/De-mux and Vice-versa. Multiplexing of the Client Signals are not Provided on this Card. Transponder card receive optical STM-16, STM-4, or CjigE client and convert them into electrical signal, this serial data output is de-serializcd and given to the framer/mapper device which then maps the client signal to a output signal based on the selected configuration, the output of the tramer/mapper device is serialized and the resulting electrical signal is then converted into a DWDM grid optical wavelength to the multiplexer unit Type-Il: SDH & GigE Muxponder This Card Supports Two Numbers of STM-4 and/or GigH Grey Clients, and can Map and/or Multiplex them onto an STM-16 Frame. In Case of Two GigE Client Signals, they arc Mapped into Generic Framing Procedure (GFP-F) as per ITU-T Rec. G.7041, and VCAT Individually, the Resulting Signals are then Multiplexed into STM-16. In Case of Two SrM-4 Client Signals they are Straight Multiplexed into STM-16. This Card can also be Configured for One GigH Client, and another as STM-4 Client, and Multiplex then onto STM-16, after their Respective Mapping. This STM-16 Signal is Further Mapped onto a Colored DWDM Wavelength and Transmitted towards the Mux/Dc-mux and Vice-versa. Muxponder card receives two optical STM-4, or GigE or combination of both client and convert them into electrical signal, this serial data output is de-serialized and given to the framer/mapper device which then maps the client signal into multiple VC and multiplex then into a STM-16 stream, the output of the framer/mapper device is serialized and the resulting electrical signal is then converted into a DWDM grid optical wavelength to the multiplexer unit. Figure 3 shows GbE Muxponder Card. This type of Muxponder multiplex two GigE optical client onto STM-16 through GFP-F, and VCAT, and transported via a 2.5G optical wavelength in the DWDM grid as per ITU-T Rec. G.694.1. In the receive side the S'fM-16 data carrying GigE payloads demuxed/demapped two streams of GigE and presented back to the client interfaces. fransponder: These Cards Take Client Input, If Require Map then In a Different Format and Further Convert then into a Particular Wavelength Muxponder: fhese Cards Apart from Mapping and Framing, Can also Multiplex Client Signal into Higher Order FEC Transponder Card Ingiire 4 shows the optical wavelength conversion process, in transmit direction where a grey SDH optical client at 1550nm is received by the receiving module and converted into electrical signal, this electrical signal is further converted back into optical signal but with DWDM grid wavelength. Similarly in receive direction the DWDM grid wavelength is converted into electrical signal by the receiving module and further into a 1550nm grey wavelength to the transmitting module. Both the receiving and the transmitting module is monitored for various alarm and performance parameter and reported to SCC (system control card. Ingurc 5 is the internal block of the OTN framer/mapper device of the transponder card. In the transmit path the optical client signal (STM-16, STM-4, or GigE) after converting lo electrical, and de-serializing is received through the east receive interface, and based on the input client type (SDH or Ethernet) it is passed to east GbE and FC monitor or east SONET monitor block, these blocks monitor the client data signals for error and performance by reading their overhead information based on the client protocol. Further the overhead information are regenerated by the east generator blocks and the resulting signal is given to the OTN frame generator, which creates the OTU frame including the FEC and sends out through east transmit interface, to the serializer device. In the receive direction the OCh processor checks the FEC for correction in the received signal, and monitor the alarm and performance by reading the overhead information, further the client signal is demapped by this block and based on the client data type passed to either west GbF: and FC monitor or west SONET monitor block. The overhead information are regenerated and presented to the west transmit interface.) The Possible Client & Line Configurations for transponder are as shown in figure 7. 7a) S rM-4 Client (622Mbps), STM-4 Line (622Mbps) [STM-4 Regenerative Mode] 7b) STM-4 Client (622Mbps), Sub-rate OTU Line with FEC Enabled (666Mbps) [STM-4 Adaptive Mode with FEC Enabled] 7c) STM-4 Client (622Mbps), Sub-rate OTU Line with FEC Disabled (666Mbps) fSTM-4 Adaptive Mode with FEC Disabled] 7d) STM-16 Client (2.48Gbps), STM-16 Line (2.48Gbps) [STM- Regenerative Mode] 7e) SrM-16 Client (2.48Gbps), OUT-1 Line with FEC Enabled (2.66Gbps) [S'I"M-16 Adaptive Mode v/ith FEC Enabled] 70 STM-16 Client (2.48Gbps), OUT-1 Line with FEC Disabled (2.66Gbps) [STM-16 Adaptive Mode with FEC Disabled] 7g) GigE Client (1.25Gbps), GigE Line (1.25Gbps) [GigE Regenerative Mode] GbE Muxponder Card The Muxponder Card is Called GbE Card Which Can Take Two STM-4, Two GbE, or One SrM-4 & One GbE and Map, Multiplex then into STM 16 as FoUowings Figure 6 is the internal block of the GFP framer/mapper device of the muxponder card. In the transmit path the optical client signal (GigE) after converting to electrical, and passing through external ethernet physical device is received at the GigE MAC block thorough its GMII interface of the GFP framer/mapper device. The Giglt MAC frame is then encapsulated into GFP frame by the GFP block. These GPF frames are put onto multiple payload containers and virtually concatenated by the VCAT block, fhese virtual containers are then TDM multiplexed to create higher order tributaries, and they are fmally mapped onto a STM-16 frame by the LTE block.) The Possible Client & Line Configurations for Muxponder are as shown in figure 8. 8a) 2xS rM-4 Client (2x622Mbps), STM-16 Line (2.48Gbps) [STM-4 Muxponder Model 8b)2xGigE Client (2xl.25Gbps), S'rM-16 Line (2.48Gbps) [GigE Muxponder Mode] 8c) lxSTM-4 + IxGigE Client (lx622Mbps + lxl.25Gbps), STM-16 Line (2.48Gbps) fSTM-4 & GigE Muxponder Mode] the present invention provides the following advantages; 1. Significant Savings in creation of Additional Bandwidth especially in Foreign Exchange. 2. the DWDM products will be widely deployed in Telecom Backbone networks in the near future. 3. the cost effective indigenous product saves the good amount of foreign exchange to the country. 4. As DWDM 8/16/32 /40 channel equipment enables the transmission of 8/16/32 /4() optical signals in a single fiber, it saves the regenerators and also reduces the amount of fiber cables to be laid to a great extent. The DWDM equipment increases the reliability. 5. DWDM equipment provides a wide bandwidth of around 80/100 Gb/s with the proposed Configuration. 6. The network expansion becomes simpler to provide new services at the economical cost. 7. This technology improves the reliability & performance of the network. 8. Compare to the conventional method of high Bandwidth data transmission this system needs lesser power for it's operation & providing large amount of power saving in Long Haul & Short haul networks. References C-Band: The Wavelength Range Between 1530nm and 1562nm used in CWDM and DWDM Applications. Channel: A Communications Path or the Signal Sent over that Path. Through Multiplexing Several Channels, Voice, and Data Channels can be Transmitted over an Optical Channel. Data Rate: The Number of bits of Information in a Transmission System, Expressed in Bits-per-second (b/s or bps), and which may or may not be Equal to the Signal or Baud rate. Demultiplexer: A Module that Separates Two or More Signals Previously Combined by Compatible Multiplexing Equipment. Dense Wavelength-Division Multiplexing (DWDM): The Transmission of Many of Closely Spaced Wavelengths in the 1550nm Region over a Single Optical Fiber. Wavelength Spacing are Usually lOOGHz or 200GHz which Corresponds to 0.8nm or 1.6nm. DWDM Bands include the C-Band. the S-Band. and the L-Band. E/O: Abbreviation for Electrical-to-optical Converter. A Device that Converts Electrical Signals to Optical Signals, such as a Laser Diode. Ethernet: A Standard Protocol (IEEE 802.3) for Local Area Network (LAN) Bus. Ethernet is a Standard for using Various Transmission Media, such as Coaxial Cables, Unshielded Twisted Pairs, and Optical Fibers. Forward Error Correcting (FEC): A Communication Technique used to Compensate for a Noisy Transmission Channel. Extra Information is Sent along with the Primary Data Payload to Correct for Errors that Occur in Transmission. (Jeneric Framing Procedure (GFP): is defined by ITU-T G.7041. This allows Mapping of Variable Length, Higher-layer Client Signals over a Transport Network like SDH/SONET. The Client Signals can be Protocol Data Unit (PDU) oriented (like IP/PPP or Ethernet Media Access Control) or can be Block-code oriented (like Fiber Channel). There arc Two Modes of GFP; Generic Framing Procedure - Framed (GFP-F) and (ieneric Framing Procedure - Transparent (GFP-T). International Telecommunications Union (ITU): A Civil International Organization, Headquartered in Geneva, Switzerland, Established to Promote Standardized Telecommunications on a Worldwide Basis. The ITU-R and the ITU-T are Committees Under the ITU, which is Recognized by the United Nations as the Specialized Agency tbr Telecommunications. Multiplexer: A Device that Combines Two or More Signals into One Output. Multiplexing: The Process by Which Two or More Signals are Transmitted over a Single Communications Channel, Examples include Time-division Multiplexing (TDM) and Wavelength-division Multiplexing (WDM). O/E: Abbreviation for Optical-to-electrical Converter. A Device used to Convert Optical Signals to Electrical Signals. Also known as OEC. Optical Channel: An Optical Wavelength Band for WDM Optical Communications. Optical Channel Spacing: The Wavelength Separation between Adjacent WDM Channels. Receiver: A Terminal Device that includes a Detector and Signal Processing Electronics. It Functions as an Optical to Electrical Converter. Transmitter: A Device that includes a Source and Driving Electronics. It Functions as an Electrical to Optical Converter. Virtual Concatenation (VCAT): is an Inverse Multiplexing Technique used to Split SONET/SDH Bandwidth into Logical Groups, which may be Transported or Routed Independently. Alternate SONET/SDH Concatenation Techniques are Contiguous Concatenation and Arbitrary Concatenation. Wavelength: The Distance between Points of Corresponding Phase of Two Consecutive Cycles of a Wave. The Wavelength Relates to the Propagation Velocity, and the Frequency Wavelength-division Multiplexing (WDM): Sending Several Signals through One I'iber with different Wavelengths of Light. 1. A method of communication in a DWDM system, said method comprising acts of; i. receiving plurality of grey optical client signals as input into a receiver; ii. mapping the received signal onto plurality of known protocols and optionally forming virtually concatenation and thereafter multiplexing, iii. mapping the multiplexed signal into colored DWDM wavelength on the transmitter path and thereby transmitting the mapped signal onto a colored DWDM channel towards DWD multiplexer card; and iv. De-multiplexing and thereafter de-mapping the transmitted colored DWDM wavelength back into the grey client signals using wavelength conversion card. 2. The method as claimed in claim 1, wherein the method maps the grey optical clients to the colored DWDM wavelength in C-Band centered around 193.1THz frequency. 3. fhc method as claimed in claim 1, wherein the mapping comprises acts of; i. monitoring the received signal for error and performance using overhead information based on the client protocol, and ii. regenerating overhead information and generating Optical Transport Unit (OUT) Irame with Forward Error Correction (FEC), 4. The method as claimed in claim 1, wherein multiplexing while mapping without virtual concatenation for the STM-4 client signal. 5. The method as claimed in claim 1, wherein converting the client signal into electrical signal and de-serializing it before mapping. 6. The method as claimed in claim 1, wherein the method provides for optical wavelength in the DWDM grid as per FFU-T Rec. G.694.1. 7. The method as claimed in claim 1, wherein the method provides for optical wavelength in the DWDM grid as per ITU-T Rec. G.709. 8. The method as claimed in claim 1, wherein the method provides required transmission related alarms, performance for supported client and line optical signals, and other related transmission parameters. 9. The method as claimed in claim 1, wherein the plurality of protocols are selected from a group comprising STM-1, STM-4, STM-16, OC-3, OC-12, OC-48, Ethernet, Fast Ethernet, Gigabit Ethernet, Fiber Channel and double Fiber Channel. 10. An OTN framer/mapper device comprising: i. A transmitting path module having a) East receive interlace to send eleclrical signal of input into east GbE & FC monitor or ease SONEl' monitor block base on the signal format for checking for error and performance, b) East generator's to added overhead information to the corresponding monitored signal, and c) OCh generator to create OTU frame with FEC and thereafter sent to scrializer device for serializing. ii. A receiving path module having a) OCh processor to check FEC for correction in received signal, b) West SONET monitor or west GbE & FC monitor for monitoring performance by reading overhead information, and c) West generator for regeneration of overhead information and providing it to west transmit interface. 11. A Gl'P framer/mapper device comprising: i. MAC block to create MAC frame from electrical signal of input, ii. GFP block to encapsulate MAC frame into GFP frame, iii. VCAT block provides virtually concatenation by filling muhiple payload containers, and iv. LTE bock to map VCAT information after Time division multiplexing onto STM-16 frame. 12. The device as claimed in claims 11 and 12, wherein the input is selected from a group comprising STM-4, STM-16, and GbE. 13. The device as claimed in claims 11 and 12, wherein the output format is selected from a group comprising STM-4, sub-rate OTU/OTN with or without FEC, STM-16, 01 U-l/OTN with or without FEC, GbE and combinations thereof 14. The device as claimed in claim 12, wherein the muxponder card takes at least 'two S rM-4 or two GbE or one STM-4 and one GbE' as client input and maps them into STN-16 output. 15. A DWDM system for communicating a given input signal by converting the signal into a predetermined colored DWDM wavelength comprising device as claimed in claim 11. 16. The system as claimed in claims 15 and 16, wherein the system is configured for transniission capacities ranging from lOGb/s to lOOGb/s. 17. A DWDM system for communicating a given input signal by converting the signal into a predetermined colored DWDM wavelength comprising device as claimed in claim 12. 18. A method of communication in a DWDM system, an OTN framer/mapper device and a Gf'P framer/mapper device as herein substantiated in the description along with accomplished drawings.

Documents:

0669-che-2008 abstract.pdf

0669-che-2008 claims.pdf

0669-che-2008 correspondence-others.pdf

0669-che-2008 description (complete).pdf

0669-che-2008 drawings.pdf

0669-che-2008 form-1.pdf

0669-che-2008 form-18.pdf

0669-che-2008 form-2.pdf

0669-che-2008 form-3.pdf

0669-che-2008 form-5.pdf

669-CHE-2008 AMENDED CLAIMS 03-02-2014.pdf

669-CHE-2008 AMENDED PAGES OF SPECIFICATION 03-02-2014.pdf

669-CHE-2008 FORM-13 03-02-2014.pdf

669-CHE-2008 FORM-13. 03-02-2014.pdf

669-CHE-2008 CORRESPONDENCE OTHERS 24-02-2012.pdf

669-CHE-2008 CORRESPONDENCE OTHERS 09-07-2012.pdf

669-CHE-2008 CORRESPONDENCE OTHERS 25-07-2012.pdf

669-CHE-2008 EXAMINATION REPORT REPLY RECEIVED 03-02-2014.pdf

669-CHE-2008 FORM-1 10-07-2008.pdf

669-CHE-2008 FORM-1 09-07-2012.pdf

669-CHE-2008 FORM-13 10-07-2008.pdf

669-CHE-2008 FORM-13 09-07-2012.pdf

669-CHE-2008 FORM-5 10-07-2008.pdf

669-CHE-2008 POWER OF ATTORNEY 03-02-2014.pdf

669-CHE-2008 POWER OF ATTORNEY 10-07-2008.pdf

669-CHE-2008 CORRESPONDENCE OTHERS 03-02-2014.pdf

669-che-2008-abstract.pdf

669-che-2008-correspondnece-others.pdf

669-che-2008-description(provisional).pdf

669-che-2008-drawings.pdf

669-che-2008-form 1.pdf

669-che-2008-form 3.pdf

669-che-2008-form 5.pdf