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Radio CHU Audio Demodulator/Decoder - doc.ntp.org
http://doc.ntp.org/archives/drivers/driver7/
The audio gain shows the current codec gain setting in the range 0 to 255. Ordinarily, the receiver audio gain control should be set for a value midway in this range. ident. The CHU identifier CHU followed by the current radio frequency code, if the CI-V interface is active, or CHU if not. The radio frequncy is encoded as 0 for 3.330 MHz, 1 for ...
Radio CHU Audio Demodulator/Decoder
http://www.fifi.org/doc/ntp-doc/html/driver7.htm
Synopsis Address: 127.127.7.u Reference ID: CHU Driver ID: CHU Modem Port: /dev/chuu; 300 baud, 8-bits, no parity Autotune Port: /dev/icom; 1200/9600 baud, 8-bits, no parity Audio Device: /dev/chu_audio and /dev/audioctl Description. This driver synchronizes the computer time using data encoded in radio transmissions from Canadian time/frequency station CHU in Ottawa, …
Reference Clock Audio Drivers - doc.ntp.org
http://doc.ntp.org/archives/4.1.1/audio/
The suite of NTP reference clock drivers currently includes three drivers suitable for these applications. They include a driver for the Inter Range Instrumentation Group (IRIG) signals produced by many radio clocks and timing devices, another for the Canadian time/frequency radio station CHU and a third for the NIST time/frequency radio ...
Line Disciplines and Streams Modules - doc.ntp.org
http://doc.ntp.org/archives/4.1.1/ldisc/
tty_chu Line Discipline/Streams Module (deprecated) This routine is a special purpose line discipline for receiving a special timecode broadcast by Canadian time and frequency standard station CHU. It has been removed from the distribution since its function has been replaced by the Radio CHU Audio Demodulator/Decoder (type 7) clock driver.
ConfiguringAudioRefclocks < Support < NTP
https://support.ntp.org/bin/view/Support/ConfiguringAudioRefclocks
The refclock config itself is a bit tricky. I've had to fuss around with the ntp.audio config here to get things going. Here's what I use for irig and wwv: # irig b (audio) # flag2 1 is line port, flag4 1 is verbose stats #server 127.127.6.0 version 4 #fudge 127.127.6.0 flag2 1 flag4 1 # wwv radio clock. time1 wwv, time2 wwvh, flag2 0=mike, 1=line.
Cisco Intrusion Prevention System Device Manager ...
https://www.cisco.com/c/ja_jp/td/docs/sec/intrusionpreventionsystem-ips-/ips4200sensors/cg/007/idm-guide/idm-setup.html
NTP Statistics remote refid st t when poll reach delay offset jitter 11.22.33.44 CHU_AUDIO(1) 8 u 36 64 1 0.536 0.069 0.001 LOCAL(0) 73.78.73.84 5 l 35 64 1 0.000 0.000 0.001 ind assID status conf reach auth condition last_event cnt 1 10372 f014 yes yes ok reject reachable 1 2 10373 9014 yes yes none reject reachable 1 status = Not Synchronized ...
[SOLVED] NTP Problem - LinuxQuestions.org
https://www.linuxquestions.org/questions/slackware-14/ntp-problem-4175503347/
If you can get one of them going, you can have good time while working out the rest of the issues. Should you need to recompile ntpd in order to use them, I think the ./configure flags will include "--enable-WWV --enable-CHU --enable-AUDIO-CHU". You can add them directly to the ntp.SlackBuild file that comes with Slackware's ntpd source code.
ConfiguringRefclocks < Support < NTP
https://support.ntp.org/bin/view/Support/ConfiguringRefclocks
NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38. ntp-4.2.8p15 was released on 23 June 2020. It ...
Network Time Protocol (NTP) - National Research …
https://nrc.canada.ca/en/certifications-evaluations-standards/canadas-official-time/network-time-protocol-ntp
The Network Time Protocol (NTP) is one of the most accurate and flexible means of sending time over the Internet. It can be used by almost any type of computer. The protocol is designed to compensate for some, but not all, network time delays between the server and the client. NTP is most successful across local area networks and can give accuracy as good as a few …
Canadian CHU Radio Modem/Audio Decoder
http://www.lightner.net/ntp/driver7.htm
Synopsis Address: 127.127.7.u Reference ID: CHU Driver ID: CHU Serial Port: /dev/chuu; 300 baud, 8-bits, no parity Audio Device: /dev/audio and /dev/audioctl Description This driver synchronizes the computer time using data encoded in radio transmissions from Canadian time/frequency station CHU in Ottawa, Ontario.
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