Thanks Stefano, I will add this to the requirements document.
Silvana "Stefano Ruffini" <[email protected]> 19/04/2009 04:44 PM To <[email protected]>, <[email protected]> cc <[email protected]> Subject RE: [TICTOC] TICTOC CALL 16 APRIL 2009 Hi, as proposed in the call I have drafted some text for the requirements summary of the cellular backhaul and circuit emulation . Two new sections could be added in the TICTOC Requirement Draft: 3.1.2 (Cellular Backhaul Requirements Summary) and 3.2.2 (Circuit Emulation Requirements Summary). See below. With respect to the Circuit emulation I noticed that in the requirements table there is "N/A" in the frequency accuracy requirement. I think we should have the following text instead: "Same frequency accuracy as for the original TDM signal; for synchronous TDM signals the (long-term) frequency accuracy is 10-11, for asynchronous TDM signals this can be in the range of +/-50 ppm (2,048 Mbit/s) or +/-32 ppm (1,544 Mbit/s)." """"""""""""""" 3.1.2 Cellular Backhaul Requirements Summary Based on table in 3.1.1, the following can be summarized for the cellular backhaul applications. Two families of technologies can be identified: * those only requiring the recovery of an accurate and stable frequency synchronization signal as a reference for the radio signal (e.g. GSM, UMTS FDD, LTE FDD). In this case the requirement ranges between 15 ppb (Wimax) and 250 ppb (UMTS Home Base Stations). This requirement is applicable on the air interface. In practice more accurate frequency on the long term is required at the input of the Base Stations (e.g. 16 ppb might be required for applications operating with 50 ppb). * mobile technologies that in addition to frequency synchronization, also need phase synchronization. This is the case for the TDD technologies such as UMTS TDD. The requirement in this case ranges between 2.5 microsecond (phase error between Base Stations) to several tens of microseconds that could be sufficient for some LTE TDD configurations. There is also a case (CDMA2000) that in addition to phase synchronization also requires the distribution of accurate time of day (3 microseconds max error during normal operation). 3.2.2 Circuit Emulation Requirements Summary The Circuit Emulation application requires the receiver to recover the same long term frequency accuracy as the original TDM signal. The phase noise (jitter and wander) of the recovered signal has to be limited according to the relevant ITU-T recommendation (e.g. G.823). There are no requirements on phase or time synchronization in this case. """""""""""""""""""""""""""" Best Regards Stefano -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Stewart Bryant Sent: venerdì 17 aprile 2009 15.53 To: [email protected] Subject: [TICTOC] TICTOC CALL 16 APRIL 2009 Notes from the call taken by Stewart Bryant A number of people had trouble dialing in. I think that this was because the dialin number is shared by two services - meetingplace and Webex. It is necessary to dial 3 to get to the Webex service before dialing the call number. If people want I will set up a call before the next TICTOC call so that people can get used to the Webex system and the doc sharing tools. We discussed the TICTOC requirements document. The plan is to add sensors and legal time, and then to go for publication with the information we have. There was some concern that the format that we had as a group chosen to use to present the parameters information was not easy to read, and that we needed to work on it. Stewart will post a different format to the list for the Cellular case and we ill see if it works better. Need to add a summary to each application section that describes our conclusion WRT that application. Need to add a summary to the whole document saying what we will aim to provide from the protocol. Metrology parameters need to be added - can't remember who signed up for that. Need to add references to where we do the data for traceability. WRT to legal Yaakov will add list of applications, pointer to some ref docs and some small amount of numeric data. Stefano agreed to write the summary for the cellular and the circuit emulation sections. Karen agreed to write Summary of summaries Yaakov will provide the Sensor and Legal text Karen will talk to Sylvana and hopefully they will work on completing the Inst and the T&M sections. Stewart will get the info for the Networking section Stewart will write a few lines on the Network Topology requirements As agreed at last WG meeting next rev will be a WG draft. Next scheduled TICTOC call will be May 7th where we will review and maybe live edit the requirements document. Comments on the plan and corrections to these notes to the TICTOC list please. ====== _______________________________________________ TICTOC mailing list [email protected] https://www.ietf.org/mailman/listinfo/tictoc
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