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10501. PSTI/Traconex 1020 WWV/WWVH Receiver
... Reference ID: WWV . Driver ID: WWV-PST . ... This driver supports the PSTI 1010 and Traconex 1020 WWV/WWVH Receivers. ... The DIPswitches should be set for 9600 bps line speed, 24-hour day- of-year format and UTC time zone. ... It is very important that the year be set correctly in the DIPswitches; otherwise, the day of year will be incorrect after 28 April of a normal or leap year. ... Specifies the driver reference identifier, an ASCII string from one to four characters, with default WWV . ...
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Ссылки http://www.sai.msu.su/~er/xntp/driver3.html -- 4.4 Кб -- 21.12.2007
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10502. Trak 8820 GPS Receiver
... Reference ID: GPS . Driver ID: GPS-TRAK . ... This driver supports the Trak 8820 GPS Station Clock. ... For best accuracy, this radio requires the tty_clk line discipline, which captures a timestamp at the * on-time character of the timecode. ... In operation, this driver sends a RQTS\r request to the radio at initialization in order to put it in continuous time output mode. ... When enabled by the flag4 fudge flag, every received timecode is written as-is to the clockstats file. time1 time . ...
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Ссылки http://www.sai.msu.su/~er/xntp/driver2.html -- 4.7 Кб -- 21.12.2007
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10503. http://www.sai.msu.su/~er/xntp/driver1.html
... Driver ID: LOCAL . This is a hack to allow a machine to use its own system clock as a reference clock, i.e., to free-run using no outside clock discipline source. ... Another application for this driver is if a particular server clock is to be used as the clock of last resort when all other normal synchronization sources have gone away. ... This driver provides a mechanism to trim the local clock in both time and frequency, as well as a way to manipulate the leap bits. ... Not used by this driver. ...
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Ссылки http://www.sai.msu.su/~er/xntp/driver1.html -- 6.6 Кб -- 21.12.2007
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10504. Miscellaneous Options
... This command specifies the default delay to be used under these circumstances. ... This command configures a trap receiver at the given host address and port number for sending messages with the specified local interface address. ... While such monitor programs may also request their own trap dynamically, configuring a trap receiver will ensure that no messages are lost when the server is started. setvar variable [ default ] . This command adds an additional system variable. ...
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Ссылки http://www.sai.msu.su/~er/xntp/miscopt.html -- 6.5 Кб -- 21.12.2007
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10505. Configuration Options
peer address [ key key ] [ version version ] [ prefer ] . server address [ key key ] [ version version ] [ prefer ] [ mode mode ] . ... The peer command specifies that the local server is to operate in symmetric active mode with the remote server. ... The broadcast command specifies that the local server is to operate in broadcast mode, where the local server sends periodic broadcast messages to a client population at the broadcast/multicast address specified. ... Options . key key . ...
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Ссылки http://www.sai.msu.su/~er/xntp/confopt.html -- 8.5 Кб -- 21.12.2007
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10506. Authentication Options
The NTP standard specifies an extension which provides cryptographic authentication of received NTP packets. ... The specification allows any one of possibly 4 billion keys, numbered with 32-bit key identifiers, to be used to authenticate an association. ... In the case of MD5, the keys are 64 bits (8 bytes). xntpd reads its keys from a file specified using the -k command line option or the keys statement in the configuration file. ... A zero key in NTP format would be specified as 8080808080808080 . ...
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Ссылки http://www.sai.msu.su/~er/xntp/authopt.html -- 7.3 Кб -- 21.12.2007
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10507. Телескоп имени Хаббла
... Избранные снимки телескопа имени Хаббла до 1998-го года . Несколько снимков до 1998-го года высокого разрешения. Снимки 1998-го, 1999-го годов . Снимки 2000-го года . Снимки 2001-го года . Снимки 2002-го года . ... Телескоп имени Хаббла был построен уже к началу восьмидесятых годов. ... Это было в 1993-м, 1997-м и 1999-м годах. Пока планируется использовать телескоп вплоть до 2005-го года. ... Снимки телескопа имени Хаббла отличаются высочайшей проработкой деталей. ...
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Ссылки http://www.sai.msu.su/ng/hst/hst_about.html -- 5.4 Кб -- 21.12.2007
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10508. Снимки 1998-го, 1999-го годов.
Снимки 1998-го, 1999-го годов (в том числе высокого разрешения) . ... Несколько снимков до 1998-го года высокого разрешения . ... Снимки 2000-го года . Снимки 2001-го года . ... NGC 7027 ра сположена приблизительно в 3 000 световых лет от Солнца в направлении созвездия Лебедя. 14 мая 1998-го года . ... Красно-желтый получен частично благодаря горячему газу, частично - из-за старших звезд в эллиптической галактике и частично - благодаря рассеиванию синего света пылью.. 19 марта 1998-го года . ...
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Ссылки http://www.sai.msu.su/ng/hst/hst_98,99.html -- 41.8 Кб -- 21.12.2007
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10509. tickadj - set time-related kernel variables
... The particular variables it is concerned with are tick , which is the number of microseconds added to the system time during a clock interrupt, tickadj , which sets the slew rate and resolution used by the adjtime system call, and dosynctodr , which indicates to the kernels on some machines whether they should internally adjust the system clock to keep it in line with time-of-day clock or not. ... Set the kernel variable tickadj to an internally computed "optimal" value. -t tick . ...
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Ссылки http://www.sai.msu.su/~er/xntp/tickadj.html -- 4.0 Кб -- 21.12.2007
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10510. Release Notes
... Please note the scripts for configuring radio clock drivers do not work. ... Machine OS Comp Notes ------------------------------------------------------------ VAX-11/785 4.3 tahoe cc none Sun3 SunOS 4.1.1 gcc no REFCLOCK (pb 93/10/25) Sun4 SunOS 4.1.1 gcc all REFCLOCK drivers (dm 93/10/25) Sun4 SunOS 4.1.3 gcc all REFLCOCK drivers Sun4 SunOS 5.1 gcc no REFCLOCK (pb 93/10/25) Sun4 SunOS 5.2 gcc no REFCLOCK (dm 93/11/20) Sun4 ...
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Ссылки http://www.sai.msu.su/~er/xntp/release.html -- 7.6 Кб -- 21.12.2007
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10511. Porting Hints
Porting to a new machine or operating system ordinarily requires updating the ./machines directory and the ./compilers directories in order to define the build environment and autoconfigure means. You will probably have to modify the ntp_machines.h file and "l_stdlib.h" files as well. ... Always define a system identifier for any new system added to the machines directory. ... This file is included by the "ntp_types.h" file and should always be placed first after the <> defines. ...
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Ссылки http://www.sai.msu.su/~er/xntp/porting.html -- 3.9 Кб -- 21.12.2007
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10512. Patching Procedures
... Please submit patches to David L. Mills (mills@udel.edu) in the form of context-diffs ( diff - c ). ... If you have changed things in more than one directory, please base the patch on the root directory of the distribution. The preferred procedure here is to copy your patch to this directory and mumble . patch -p <your_patch> . ... If you have whole new files, as well as patches, wrap the files and patches in a shell script. ... Send us patches for the ./html files as well. ...
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Ссылки http://www.sai.msu.su/~er/xntp/patches.html -- 3.3 Кб -- 21.12.2007
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10513. ntptime - read kernel time variables
ntptime [ -chr ] [ -e est_error ] [ -f frequency ] [ -m max_error ] [ -o offset ] [ -s status ] [ -t time_constant ] . This program is useful only with special kernels described in the A Kernel Model for Precision Timekeeping page. It reads and displays time-related kernel variables using the ntp_gettime() system call. ... Display the execution time of ntptime itself. -e est_error . Specify estimated error, in microseconds. -f frequency . ... Display times in Unix timeval format. ...
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Ссылки http://www.sai.msu.su/~er/xntp/ntptime.html -- 2.6 Кб -- 21.12.2007
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10514. ntpdate - set the date and time via NTP
ntpdate [ -bBdosu ] [ -a key ] [ -e authdelay ] [ -k keyfile ] [ -o version ] [ -p samples ] [ -t timeout ] server [ ... ] . ntpdate sets the local date and time by polling the Network Time Protocol (NTP) server(s) given as the server arguments to determine the correct time. ... A number of samples are obtained from each of the servers specified and a subset of the NTP clock filter and selection algorithms are applied to select the best of these. ... The default is /etc/ntp.keys . ...
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Ссылки http://www.sai.msu.su/~er/xntp/ntpdate.html -- 7.0 Кб -- 21.12.2007
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10515. Time and Time Interval Measurement with Application to Computer and Network
The technical memorandum: Time and Time Interval Measurement with Application to Computer and Network Performance Evaluation (PostScript) describes a number of techniques for conducting experiments typical of computer network and transmission systems engineering. ... The usual data collected during a performance run of some experiment might include time offsets, time delays, frequency offsets and various error statistics. ...
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Ссылки http://www.sai.msu.su/~er/xntp/measure.html -- 3.6 Кб -- 21.12.2007
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10516. md5 - generate message digest
. md5 [ -0123456789 ] [ -h] file . This program generates the message digest of the given file using the RSA Message Digest 5 (MD5) and other selected algorithms. If file is not given, the program uses the standard input. -0123456789 . Select algorithm from the following list . -0 null . -1 MD5 . -2 SNEFRU . -3 CRC32 . -4 CRC16 . -5 MD4 . -6 MD2 . -7 SHA . -8 HAVAL . -9 null . -h . Display the result in hex; the default is base-64 . David L. Mills (mills@udel.edu)
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Ссылки http://www.sai.msu.su/~er/xntp/md5cert.html -- 1.9 Кб -- 21.12.2007
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10517. A Kernel Programming Interface for Precision Time Signals Network Performance
The technical memorandum: A Kernel Programming Interface for Precision Time Signals (PostScript) describes a proposed programming interface for external precision time signals, such as the pulse-per-second (PPS) signal generated by some radio clocks and cesium oscillators. ... The hardware to do this requires only a serial port and a modem control lead, such as the data carrier detect (DCD) lead, which can be driven by an external source via a level converter/pulse generator. ...
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Ссылки http://www.sai.msu.su/~er/xntp/kernpps.html -- 2.1 Кб -- 21.12.2007
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10518. APOD Index - Quasars
Archive | Index | ... Gamma-Ray Quasars . A Quasar-Galaxy Collision? ... A Milestone Quasar . NGC 3393: A Super Spiral? Why Is QSO 1229+204 So Bright? This index contains previous Astronomy Pictures of the Day (TM) sorted by subject and is updated monthly. Therefore, only APODs occurring before the beginning of this month are currently indexed. The chronological archive is completely current. ... NASA Technical Rep.: ... Specific rights apply. ...
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Ссылки http://www.sai.msu.su/apod/lib/quasars.html -- 3.0 Кб -- 21.12.2007
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10519. APOD Index - Solar System: Neptune
Archive | Index | ... The Clouds of Neptune . ... Neptune: Big Blue Giant . Neptune's Great Dark Spot: Gone But Not Forgotten . Neptune's Moon Proteus . Our Solar System from Voyager . ... Therefore, only APODs occurring before the beginning of this month are currently indexed. The chronological archive is completely current. ... NASA Technical Rep.: ... Specific rights apply. A service of: LHEA at NASA / GSFC . ...
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Ссылки http://www.sai.msu.su/apod/lib/neptune.html -- 2.9 Кб -- 21.12.2007
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10520. APOD Index - Galaxies: Spirals
... Index | ... Arp 230: Two Spirals in One? Galaxy Dwingeloo 1 Emerges . ... M51: The Whirlpool Galaxy . In the Center of the Whirlpool (M51) . ... Leo Triplet Spiral Galaxy M65 . Unusual Spiral Galaxy M66 . M74: A Grand Design Spiral Galaxy . ... M81: A Bulging Spiral Galaxy . ... Spiral Galaxy M83 . Spiral Galaxy M90 . ... Spiral Galaxy M100 . ... A Spiral Galaxy Gallery . ... Therefore, only APODs occurring before the beginning of this month are currently indexed. ...
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Ссылки http://www.sai.msu.su/apod/lib/spirals.html -- 4.7 Кб -- 21.12.2007
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