~ INTERNATIONAL TELECOMMUNICATION UNION
`
`ITU-T
`
`TELECOMMUNICATION
`STANDARDIZATION SECTOR
`OF ITU
`
`G.992.1
`
`(06/99)
`
`SERIES G: TRANSMISSION SYSTEMS AND MEDIA,
`DIGITAL SYSTEMS AND NETWORKS
`Digital transmission systems - Digital sections and digital
`line system - Access networks
`
`Asymmetric digital subscriber line (ADSL)
`transceivers
`
`ITU-T Recommendation G.992.1
`
`(Previously CCITT Recommendation)
`
`TQ Delta Exhibit 2006
`Cisco Systems, Inc. v. TQ Delta LLC
`IPR2016-01006
`
`1
`
`

`

`ITU-T G-SERIES RECOMMENDATIONS
`
`TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS
`
`INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS
`INTERNA TIONAL ANALOGUE CARRIER SYSTEM
`GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER(cid:173)
`TRANSMISSION SYSTEMS
`INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE
`SYSTEMS ON METALLIC LINES
`GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE
`SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION
`WITH METALLIC LINES
`COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY
`TESTING EQUIPMENTS
`TRANSMISSION MEDIA CHARACTERISTICS
`DIGITAL TRANSMISSION SYSTEMS
`TERMINAL EQUIPMENTS
`DIGITAL NETWORKS
`DIGITAL SECTIONS AND DIGITAL LINE SYSTEM
`General
`Parameters for optical fibre cable systems
`Digital sections at hierarchical bit rates based on a bit rate of 2048 kbiUs
`Digital line transmission systems on cable at non-hierarchical bit rates
`Digital line systems provided by FDM transmission bearers
`Digital line systems
`Digital section and digital transmission systems for customer access to ISDN
`Optical fibre submarine cable systems
`Optical line systems for local and access networks
`Access networks
`
`For further details, please refer to ITU-T List of Recommendations.
`
`G.100-G.199
`
`G .200-G .299
`
`G.300-G.399
`
`GAOO-GA49
`
`GA50-GA99
`
`G.600-G.699
`
`G. 700-G. 799
`G.800-G.899
`G.900-G.999
`G.900-G.909
`G.910-G.919
`G.920-G.929
`G.930-G.939
`G.940-G.949
`G.950-G.959
`G.960-G.969
`G.970-G.979
`G.980-G.989
`G.990-G.999
`
`2
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`

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`ITU-T RECOMMENDATION G.992.1
`ASYMMETRIC DIGITAL SUBSCRIBER LINE (ADSL) TRANSCEIVERS
`
`3)
`
`Summary
`This Recommendation describes Asymmetric Digital Subscriber Line (ADSL) Transceivers on a
`metallic twisted pair that allows high-speed data transmission between the network operator end
`(ATU-C) and the customer end (ATU-R). This Recommendation provides a variety of bearer
`channels in conjunction with one of three other services dependent on the environment:
`1)
`ADSL transmission simultaneously on the same pair with voice (band) service;
`2)
`ADSL transmission simultaneously on the same pair with G.961 (Appendix I or II) ISDN
`serVIces; or
`ADSL transmission on the same pair with voiceband transmission and with TCM-ISDN
`(G.961 Appendix III) in an adjacent pair.
`Systems allow approximately 6 Mbit/s downstream and approximately 640 kbit/s upstream data rates
`depending on the deployment and noise environment.
`This Recommendation specifies the physical layer characteristics of the Asymmetric Digital
`Subscriber Line (ADSL) interface to metallic loops.
`This Recommendation has been written to help ensure the proper interfacing and interworking of
`ADSL transmission units at the customer end (ATU-R) and at the network operator end (ATU-C)
`and also to define the transport capability of the units. Proper operation shall be ensured when these
`two units are manufactured and provided independently. A single twisted pair of telephone wires is
`used to connect the ATU-C to the ATU-R. The ADSL transmission units must deal with a variety of
`wire pair characteristics and typical impairments (e.g. crosstalk and noise).
`An ADSL transmission unit can simultaneously convey all of the following: downstream simplex
`bearers, duplex bearers, a baseband analogue duplex channel, and ADSL line overhead for framing,
`error control, operations and maintenance. Systems support a minimum of 6.144 Mbit/s downstream
`and 640 kbit/s upstream.
`This Recommendation includes mandatory requirements, recommendations and options; these are
`designated by the words "shall", "should" and "may" respectively. The word "will" is used only to
`designate events that take place under some defined set of circumstances.
`Two categories of performance are specified. Category I performance is required for compliance
`with this Recommendation; performance enhancement options are not required for category I
`equipment. Category II is a higher level of performance (i.e. longer lines and greater impairments).
`Category II performance and characteristics are not required
`for compliance with
`this
`Recommendation.
`This Recommendation defines several optional capabilities and features:
`•
`echo cancellation;
`trellis coded modulation;
`dual latency;
`transport of a network timing reference;
`•
`transport ofSTM and/or ATM;
`•
`reduced overhead framing modes.
`•
`It IS the intention of this Recommendation to provide, by negotiation during initialization, for
`U-interface
`compatibility and
`interoperability between
`transceivers complying
`to
`this
`Recommendation and between transceivers that include different combinations of options.
`Source
`ITU-T Recommendation G.992.l was prepared by ITU-T Study Group 15 (1997-2000) and was
`approved under the WTSC Resolution No.1 procedure on 22 June 1999.
`
`Recommendation G.992.1
`
`(06/99)
`
`3
`
`

`

`FEC output data frame: The grouping of bytes from fast or interleaved path over a single
`3.19
`symbol time period after addition of FEC bytes and before interleaving (at reference point B,
`Figures 7-8, and 7-9).
`
`3.20
`
`indicator bits: Bits used for OAM purposes; embedded in the synchronization bytes.
`
`loading coils: Inductors placed in series with the cable at regular intervals in order to
`3.21
`improve the voiceband response; removed for DSL use.
`
`3.22 Mux data frame: The grouping of bytes from fast or interleaved path over a single symbol
`time period before addition of FEC bytes and before interleaving (at reference point A, Figures 7-8
`and 7-9).
`
`near-end: Near-end means performance of the loop-side received signal at the input of the
`3.23
`ATU (see Figure 9-4).
`
`3.24
`net data rate: Data rate that is available for user data in anyone direction; for the
`downstream direction this is the sum of the net simplex and duplex data rates.
`
`network timing reference: An 8 kHz timing marker used to support the distribution of a
`3.25
`timing reference over the network.
`
`primitives: Primitives are basic measures of performance, usually obtained from digital
`3.26
`signal line codes and frame formats, or as reported in overhead indicators from the far-end.
`Performance primitives are categorized as events, anomalies and defects. Primitives may also be
`basic measures of other quantities (e.g. ac or battery power), usually obtained from equipment
`indicators (see Figure 9-4).
`
`3.27
`
`subcarrier: A particular complex valued input, Zi, to the IDFT (see 7.11.2).
`
`showtime: The state of either ATU-C or ATU-R-reached after all initialization and
`3.28
`training is completed - in which user data is transmitted.
`
`single latency: Simultaneous transport of one or more bearer channels in anyone direction,
`3.29
`in which all user data is allocated to either the fast or the interleaved path; that is, either sum(BF) > 0
`or sum(Br) > O.
`3.30
`splitter: Filter that separates the high frequency signals (ADSL) from the voiceband signals;
`(frequently called POTS splitter even though the voiceband signals may comprise more than POTS).
`
`superframe: A grouping of 68 data symbols and one synchronization symbol, over a total
`3.31
`time duration of 17 ms (see Figure 7-5).
`
`symbol rate: The rate at which all symbols, including the synchronization symbol, are
`3.32
`transmitted [(69/68)*4.0 = 4.0588 kbaud]; contrasted with the data symbol rate.
`3.33
`sync byte: An overhead byte present at the beginning of each mux data frame (called "fast"
`byte in the fast path and "sync" byte in the interleaved path).
`
`sync frame: A frame with deterministic content sent in the 69th symbol of a superframe
`3.34
`(called "synchronization symbol" in Figure 7-5).
`
`3.35
`
`3.36
`
`3.37
`
`3.38
`
`thresholds: See clause 8/G.997.1.
`
`Threshold Crossing Alert: See Recommendation G.997.1.
`
`total data rate: Aggregate data rate plus FEC overhead.
`
`upstream: The transport of data in the ATU-R to ATU-C direction.
`
`voiceband: 0 to 4 kHz; expanded from the traditional 0.3 to 3.4 kHz to deal with voiceband
`3.39
`data services wider than POTS.
`
`3.40
`
`voiceband services: POTS and all data services that use the voiceband or some part of it.
`
`Recommendation G.992.1
`
`(06/99)
`
`5
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`4
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