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Corelatus' Blog | mostly narrowband telecommunications | corelatus.wordpress.com Reviews
https://corelatus.wordpress.com
mostly narrowband telecommunications (by Matt Lang)
corelatus.wordpress.com
Decoding MTP-3 and ISUP | Corelatus' Blog
https://corelatus.wordpress.com/2009/03/25/decoding-mtp-3-and-isup
The timestamp field in signalling headers. Perl example code for GTH: SS7 ISUP decoding and playback/record →. Decoding MTP-3 and ISUP. March 25, 2009. Sometimes, you want to look at the signalling on an E1 and use it to figure out when telephone calls start and stop. In SS7 networks, call setup and tear-down is done by the ISUP layer, which fits in to the SS7 stack like this:. Layer 1: MTP-1 (typically an 2Mbit/s E1 or a 1.5Mbit/s/T1). If you have a GTH. Do it for you. There’s a note. 55 00 6e 00. MTP-2...
June | 2009 | Corelatus' Blog
https://corelatus.wordpress.com/2009/06
Monthly Archives: June 2009. Generating DTMF using a ‘player’ on GTH. June 9, 2009. In-band signalling tones on a timeslot. That’s useful for testing and for building active in-band signalling systems. The tones transmitted when the subscriber presses a number key on fixed or mobile handset are called DTMF. Wikipedia has an article. Here’s a .zip file with DTMF tones. In it Each file is raw ALAW data, i.e. it’s ready for the GTH to play (transmit) on a timeslot. New clip name='dtmf5'/ /new. Sometimes you...
Generating DTMF using a ‘player’ on GTH | Corelatus' Blog
https://corelatus.wordpress.com/2009/06/09/generating-dtmf-using-a-player-on-gth
Perl example code for GTH: SS7 ISUP decoding and playback/record. Capturing SS7 with wireshark or tshark →. Generating DTMF using a ‘player’ on GTH. June 9, 2009. In-band signalling tones on a timeslot. That’s useful for testing and for building active in-band signalling systems. The tones transmitted when the subscriber presses a number key on fixed or mobile handset are called DTMF. Wikipedia has an article. Here’s a .zip file with DTMF tones. New clip name='dtmf5'/ /new. And now send the 800 byte file).
February | 2009 | Corelatus' Blog
https://corelatus.wordpress.com/2009/02
Monthly Archives: February 2009. SOX parameters for downsampling to 8kHz Alaw. February 19, 2009. I took this audio snippet from the introduction to an audio book. It was originally a .ogg file. I converted it to a .wav file with a 44.1kHz sampling rate and 16 bits per sample. For my purposes any artefacts from ogg vorbis are negligible. 441kHz, 16 bit linear samples). Next, I converted it to 8kHz Alaw using sox. Sox 1 mono.wav -A -r 8000 2 8kHz alaw.wav. 2 8kHz alaw.wav. 8kHz, 8 bit Alaw samples). Sox o...
Audio power levels on E1/T1 timeslots: the digital milliwatt | Corelatus' Blog
https://corelatus.wordpress.com/2009/10/10/audio-power-levels-on-e1t1-timeslots-the-digital-milliwatt
How does TCP behave on an interrupted network? So long, wordpress →. Audio power levels on E1/T1 timeslots: the digital milliwatt. October 10, 2009. Subscriber can be forwarded to a human operator. New level detector threshold='-20'. Pcm source span='2A' timeslot='13'/. Take a 100ms block of audio (800 samples). Square all the samples. If the sum exceeds the loudness threshold, send an XML event. There are some details to worry about. A-law: 34 21 21 34 b4 a1 a1 b4. Mu;-law: 1e 0b 0b 1e 9e 8b 8b 9e.
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E1/T1 Monitor 3.0. SDH Monitor 3.0. Corelatus develops a range of 19" rack-mounted products to connect to E1/T1 and SDH/SONET telecommuncation links. All products are controlled over ethernet. Our customers are system builders who add their own application software on a server and market the complete package to telecom operators. E1/T1 Monitor 3.0. E1/T1 Monitor 3.0. E1/T1 Monitor 3.0 has 64 E1/T1 receivers, so it can connect to both. SDH Monitor 3.0. The SDH Monitor 3.0. SDH Monitor 3.0 connects to ...
Corelatus Products
E1/T1 Monitor 3.0. SDH Monitor 3.0. Corelatus develops a range of 19" rack-mounted products to connect to E1/T1 and SDH/SONET telecommuncation links. All products are controlled over ethernet. Our customers are system builders who add their own application software on a server and market the complete package to telecom operators. E1/T1 Monitor 3.0. E1/T1 Monitor 3.0. E1/T1 Monitor 3.0 has 64 E1/T1 receivers, so it can connect to both. SDH Monitor 3.0. The SDH Monitor 3.0. SDH Monitor 3.0 connects to ...
Corelatus' Blog | mostly narrowband telecommunications
So long, wordpress. January 29, 2010. I no longer use wordpress to host this blog, I compile it to static files using chronicle instead. It’s still at the same address (blog.corelatus.com). Though, so the only way to see this post is to stumble on it via a search engine. Audio power levels on E1/T1 timeslots: the digital milliwatt. October 10, 2009. Subscriber can be forwarded to a human operator. New level detector threshold='-20'. Pcm source span='2A' timeslot='13'/. Square all the samples. In this pos...
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