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`...
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`c:>--c:
`-=-........ _
`:_
`::::::>~""
`::::::>~.
`
`~
`
`§~orable Commissioner of Patents and Trademarks
`-o
`~ ashington, DC 20231
`
`PATENT
`103118-0066
`
`NEW PROVISIONAL APPLICATION TRANSMITTAL LETTER
`
`Sir:
`
`Transmitted herewith for filing is the Provisional Patent Application oflnventor(s):
`
`Residence:
`
`David M. Krinsky
`
`4AyerRoad
`Acton, MA 01720
`
`Oitizenship
`
`United States
`
`~st Office Address:
`:~~
`~Al
`
`Same as above
`
`f:.3
`~Residence:
`
`~'.l:i tizenship
`
`:3~::::
`i~,i
`
`Robert E. Pizzano, Jr.
`
`5 Bow Street Court
`Stoneham, MA 02180
`
`United States
`
`Post Office Address:
`
`Same as above
`
`CSCO-1008
`Cisco v. TQ Delta
`Page 1 of 7
`
`

`
`PATENTS
`103118-0066
`
`·For: Multicarrier Modulation System with Remote Diagnostic Transmission Mode
`
`Enclosed are the following papers required to obtain a filing date under 37 C.F.R. § l .53(c):
`
`0
`5
`0
`
`Sheets of Informal Drawings
`Pages of Specification, Drawings & Tables
`Claims
`
`The following papers, if indicated by an r8], are also enclosed:
`
`D
`A Declaration and Power of Attorney
`D
`An Assignment of the invention
`D
`An Information-Disclosure Statement, Form PT0-1449 and a copy of
`each cited reference
`Im]
`A Small-Entity Declaration
`Iii A Certificate of Express Mailing, Express Mail Label No. EE437022889US
`
`Basic Fee:
`
`$150
`
`~ A check in the amount of $150 is enclosed to cover the Filing Fee.
`
`Please address all communications and telephone calls to the undersigned.
`
`Respectfully submitted,
`
`Gail Leonick
`Aware, Inc.
`40 Middlesex Turnpike
`Bedford, MA 01730
`
`- 2 -
`
`Page 2 of 7
`
`

`
`PATENT
`103118-0066
`
`UNITED STATES PROVISIONAL PATENT APPLICATION
`
`of
`
`David M. Krinsky and Robert E. Pizzano, Jr.
`
`fora
`
`MULTICARRIER MODULATION SYSTEM WITH REMOTE DIAGNOSTIC
`
`TRANSMISSION MODE
`
`Page 3 of 7
`
`

`
`Aware Proprietary and Confidential
`
`Patent
`103118-0066
`
`Multicarrier Modulation System with Remote Diagnostic Transmission Mode
`!2y
`David M. Krinsky and Robert E. Pizzano, Jr.
`
`Overview of the Invention
`Exchange of diagnostic and test information between transceivers is an important part of
`an ADSL deployment. In cases when the transceiver connection is not performing as
`expected (e.g. the data rate is low, there are many bit errors, a data link is not possible,
`etc) it is important to be able to get diagnostic and test information from the remote
`modem without having to send a technician to the remote modem site to collect and
`analyze the data. Dispatching a technician to a remote site (also known as a "truck roll")
`is very expensive and time consuming.
`This invention describes a method of exchanging diagnostic and test information between
`two transceivers in a simple and robust manner. The information is exchanged by putting
`the transceivers into a new Diagnostic (Diag) Link mode. In this Diag Link mode
`information is communicated using a signaling mechanism that has a very high immunity
`to noise and therefore can operate effectively even in the cases when the transceivers
`could not actually achieve a good connection under their normal operational mode. As an
`example if the transceivers fail to complete initialization and do not enter normal steady
`state mode (where the diagnostic and test information would be exchanged in the prior
`art) the transceiver can enter this robust Diag Link mode. In the Diag Link mode the
`transceivers exchange the diagnostic and test information that is required for the
`technician to determine the cause of the failure without having to go to the remote site to
`collect data. The information exchanged includes (but is not limited to) signal to noise
`ration (SNR) information, equalizer information, programmable gain setting information,
`bit allocation information (number of bits allocated to each carrier), transmitted and
`received power information, margin information, status and rate information, telephone
`line condition information (e.g. length ofline, number and location of bridged taps, wire
`gauge, etc) etc. Many of these parameters are specified in ADSL standards in the ITU
`(G.992.l and G.992.1) and ANSI (Tl.413). Others are specific to the transceiver
`implementation. Others are specific to the installation and deployment environment. As
`other new important parameters are found to be critical in determining the cause of a
`specific failure or problem they can be easily added to the list of information parameters
`exchanged in the Diag Link mode.
`
`Preferred Embodiment of the Invention
`This preferred embodiment describes the communication of diagnostic information from
`the remote terminal (RT) transceiver to the central office (CO) transceiver. Transmission
`of information from the RT to the CO is important because the ADSL service provider
`located in the CO can then easily determine problems without a truck roll. Obviously the
`invention described can be applied to communication in the other direction (CO to RT) as
`well.
`Transceivers with Diag Link mode capability complete a portion (e.g. 90%) of normal
`standard training procedure and then enter into the Diag Link mode. The transition into
`Diag Link mode is done by transmitting a message from the CO modem to the RT
`
`Page 4 of 7
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`

`
`A ware Proprietary and Confidential
`
`Patent
`103118-0066
`
`modem indicating that the transceivers are to enter into Diag Link mode instead of
`transitioning into normal steady state data transmission. In the Diag Link mode the RT
`transceiver sends the diagnostic information in the form of a collection of information
`bits that are modulated by using 1 bit per DMT symbol modulation as is used in the C(cid:173)
`Ratesl message in the ITU and ANSI ADSL standards (the DMT symbol may or may not
`include a cyclic prefix). In this message encoding scheme a bit with value 0 is mapped to
`the REVERBI signal and bit with a value of 1 mapped to a SEGUEl signal. REVERBl
`and SEGUE! are defined in the ITU and ANSI ADSL standards. The REVERBI signal
`is generated by modulating all of the carriers in the multi carrier system with a known
`pseudo-random sequence thus generating a wideband modulated signal. The SEGUE I
`signal is generated from a carrier by carrier 180 degree phase reversal of the REVERB 1
`signal. Since both signals are wideband and known in advance, the receiver can easily
`detect the REVERBI and SEGUEI signal using a simple matched filter in the presence
`of large amounts of noise and other disturbances.
`
`~:
`
`Table 1: Diag Link Message
`Variable
`Length
`Start
`Address
`0
`256
`512
`1024
`1536
`1792
`2048
`2112
`2144
`2154
`2158
`2160
`2164
`2168
`2170
`2174
`2178
`
`snrdB table1
`snrdB_table3
`sync_ correlation
`rx_fdq
`rx_gs
`rx_bat
`rx_trb
`TDQSetting_ Taps
`rms_squared1
`PGA_gain
`CutbackSetting
`Margin Desired
`RATEArray
`STAT Array
`ADPTArray
`PSDMArray
`Future Use
`
`256
`256
`512
`512
`256
`256
`64
`32
`10
`4
`2
`4
`4
`2
`4
`4
`1822
`
`Tablel shows an example of a message that is sent by the RT to the CO during the Diag
`Link mode transmission mode. In this example, the RT sends a 4000 word (byte)
`message to the CO. The variables (snrdB_tablel, snrdB_table3, sync_correlation, etc)
`represent the type of diagnostic and test information that is used to analyze the condition
`of the link. These variables are actually arrays with different length depending on the
`information they contain. For example snrdB_tablel is a 256 length array containing the
`SNR of each of the 256 carrier in the multicarrier ADSL modem as measured during a
`specific stage of initialization. As described in the previous section the message can
`
`2
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`A ware Proprietary and Confidential
`
`Patent
`103118-0066
`
`contain many different diagnostic and test information. As more variables are added the
`addresses in the message labeled "future use" are utilized. Obviously the message length
`can be increased to support even more variables. In this example the message is sent 5
`times by the RT, with a CRC sent each time. The CO decodes messages until the CRC
`passes or 5 CRC failures have occurred. If the CRC fails on all 5 messages the system
`will attempt to re-initialize and re-enter the Diag Link mode. In the new Diag Link mode
`the transmit power used to transmit the REVERBl and SEGUE I messages is increased in
`order to communicate the DIAG Link message to the CO without CRC errors. Once
`again, the message is sent 5 times by the RT, with a CRC sent each time. The CO
`decodes messages until the CRC passes or 5 CRC failures have occurred. If, once again,
`the CRC fails on all 5 messages the system will attempt to re-initialize and re-enter the
`Diag Link mode at an even higher power level. This process continues until the Diag
`Link information is communicated correctly or the transmitter reaches its maximum
`transmission power level. The flowchart for this process is shown in figure 1.
`
`Transceivers enter Diag Link Mode
`
`RT transmits Diag Link message with
`CRC (repeated 5 times)
`
`CO receives the 5 Diag Link messages
`and calculates the CRC
`
`No
`
`Increase Diag
`Link mode
`transmission
`powerby3 dB
`
`Yes
`
`CO receives the Diag information and
`exits Diag Link mode.
`
`3
`
`Page 6 of 7
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`

`
`Aware Proprietary and Confidential
`
`Patent
`103118-0066
`
`Figure 1: Flowchart for Diag Link messaging
`
`Although the above description discusses the use of multicarrier modulation for ADSL, it
`is clear that this invention also applies to any system using multicarrier modulation in
`which access to remote diagnostic information is important.
`Although this invention has been illustrated by reference to specific embodiments, it will
`be apparent to those skilled in the art that various changes and modifications may be
`made which clearly fall within the scope of the invention.
`
`4
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`Page 7 of 7