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Topic: POCSAG

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	The POCSAG Paging Protocal
		POCSAG as defined in the standard, (original POCSAG) is 512 bits per second direct FSK (not AFSK) of the carrier wave with +- 4.5 khz shift (less deviation than that is used in some US systems).
		The basic unit of data in a POCSAG message is the codeword which is always a 32 bit long entity.
		As far as I know there is no POCSAG specified restriction on length but particular pagers of course have a fixed number of characters in their display.
	www.aaroncake.net /schoolpage/pocsag.htm (1464 words)

	POCSAG experiments.
		POCSAG messages are modulated using binary frequency shift keying (FSK) +- 4.5 kHz and the data speed is 512, 1200, or 2400 bits/s.
		The purpose of the preamble is for the receiver to identify the incoming of a POCSAG signal and as a synchronisation pattern for the data decoding of batches.
		The difficult is to set the scmitt-trigger levels because the amplitude of the POCSAG signal changes depending on the data.
	hem.passagen.se /communication/pocsag.html (2293 words)

	z o r g . o r g - POCSAG Pager Decoding
		POCSAG (Post Office Code Standards Advisory Group) is a common paging transmission format.
		POCSAG decoder software is able to display pager messages by using a normal radio scanner, a computer and a soundcard.
		Ideally for POCSAG decoding you want a scanner with a discriminator output but I'm using an Icom IC-R2 and this doesn't have one.
	www.zorg.org /radio/pocsag.php (253 words)

	[No title]
		POCSAG generation was broken into many segments, or sub VIs, and tested as the code was developed.
		Since the task of POCSAG generation was broken down into many small pieces, it was much easier to develop and test this portion of the software as it built upon itself.
		The task of converting the POCSAG batches into an actual FSK signal is handled by a data acquisition card (DAQ) and a function generation.
	www.ee.unb.ca /thesis97/ee4000u/Chapter5.htm (1365 words)

	"Off the Air" and "Switch" based Paging Signals
		POCSAG is an asynchronous protocol, it has a start up preamble signal that alerts the pager to an incoming message (wake up).
		POCSAG as defined in the standard, (original POCSAG) is 512 bits per second direct FSK not AFSK) of the carrier wave with +/- 4.5 khz shift.
		The first (msb) bit of every POCSAG codeword (bit 31) indicates whether the codeword is an address codeword (pager address) (bit 31 =0) or a message codeword (bit 31 = 1).
	www.sytechcorp.com /new_site/SytechCorp/SyTechCorpXY/PAGER03.asp (2839 words)

	POCSAG
		We are dealing with digital data that is send over a radio frequency, all we need to do is receive the signals via a radio scanner and convert the audio signal into digital data using a computer.
		If a transmitter is also connected to the computer, POCSAG signals can also be broadcast (It is illegal to transmit radio signals without an amateur radio license).
		POCSAG signals are used not only for paging, but also for controlling such things as hydroelectric substations, railway switches, road information signs, and industrial operations.
	mypage.uniserve.ca /~dharris/Pager/poc.htm (1971 words)

	The POCSAG Paging Protocol
		The POCSAG code is a synchronous paging format that allows pages to be transmi tted in a single-batch structure.
		The decoder uses the preamble both to determine if the data received is a POCSAG signal and for synchronization wit h the stream of data.
		Each POCSAG codeword is capable of providing address information for four different paging sources (Address 1 through Address 4).
	www.sxlist.com /techref/pager/pocsag.html (722 words)

	[No title]
		The second major difficulty was that a pager transmission from the service provider in the same frequency band would interfere with a simultaneous transmission from the pager tester and seriously distort test results.
		The POCSAG standard defines the format used to encode messages and the standards for message transmission [2], [5].
		POCSAG defines pager transmission protocol as 512, 1200, or 2400 bits/s and the transmission band as the 900 MHz range [5].
	www.ee.unb.ca /thesis97/ee4000u/Chapter1.htm (639 words)

	Verizon Learning Center - Wireless Technology - Paging - Page 1 of 3
		The original POCSAG protocol operated at 512b/s, but was later upgraded to 1.2kb/s and then again to 2.4kb/s.
		At 2.4kb/s, the duration of a numeric page transmission was reduced to 13-milliseconds; increasing the throughput of data by approximately 150 times compared to that of POCSAG 512.
		Today, POCSAG is on the verge of becoming obsolete as much improved codes take over.
	www22.verizon.com /about/community/learningcenter/articles/displayarticle1/0,1727,1156z1,00.html (734 words)

	Personal radio paging receiver having sync signal controlled DC/DC converter - Patent 5420576
		The control section divides the POCSAG signal into a first sync signal portion and a second batch signal portion, and outputs a control signal during a period of the first portion.
		A receiver according to claim 1, further comprising a charging/discharging circuit constituted by a diode for supplying a charging current from said DC/DC converter to said secondary battery during a period of the first portion, and supplying a current from said secondary battery to said control section during a period of the second portion.
		The POCSAG signal consists of a preamble 301 and a plurality of batches 304 and 307.
	www.freepatentsonline.com /5420576.html (1743 words)

	POCSAG - Post Office Code Standardization Advisory Group
		POCSAG is a acronym that can contains many meanings which are listed below.
		There may be many popular meanings for POCSAG with the most popular definition being that of Post Office Code Standardization Advisory Group
		If you have more information or know of another definition for POCSAG, please let us know so that we can review it and add that information to our database.
	www.auditmypc.com /acronym/POCSAG.asp (189 words)

	The POCSAG Paging Protocol
		The POCSAG code is a synchronous paging format that allows pages to be transmitted in a single-batch structure.
		The decoder uses the preamble both to determine if the data received is a POCSAG signal and for synchronization with the stream of data.
		The POCSAG signaling standard has reserved special codewords for the AFS from 2,000,000 to 2,097,151.
	www.refreq.com /braddye/epocsag.html (695 words)

	P46-8 (Site not responding. Last check: 2007-10-12)
		The most common by far is POCSAG (Post Office Standardization Advisory Group), a standard set by the British Post Office and adopted world-wide for paging.
		POCSAG is transmitted at three transmission rates--512, 1200 and 2400 bps.
		Using a POCSAG feature known as OTP (over the air programming) the service provider can instruct the paging receiver to add capcodes, remove capcodes, or even shut itself down in the case of non-payment.
	www.gadgettech.org /pager/p46-8.html (2963 words)

	Desktop Pocsag Paging Transmitters
		This desktop pocsag transmitter sends a unique message to a preprogrammed capcode (pager) for each of the 50 buttons.
		This desktop pocsag transmitter sends a unique message to preset pagers from each of the 19 available buttons.
		The SPPSF may be used as a pocsag store and forward repeater or as a cross band repeater to extend paging system coverage.
	www.i-mobile.com.au /tx-desktop.html (145 words)

	[No title]
		Interfacing The PD program requires serial POCSAG data to be applied to the CTS pin of one of the PC's COM ports.
		As POCSAG is transmitted as direct FSK of the VHF/UHF carrier the ideal way is to take the data direct from the discriminator, via a data slicer.
		In Debug mode the raw POCSAG codewords are dumped to the screen in hex form, eg:- 7A89C197 7A89CI97 7A89C197 7A89C197 7A89C197 7A89C197 7A89C197 7A89C197 7A89C197 7A89C197 14083EE2 7A89C197 7A89C197 7A89C197 7A89C197 7A89C197 Any codewords which do not pass the BCH and parity error checking are highlighted.
	www.textfiles.com /computers/DOCUMENTATION/pd.txt (1036 words)

	POCSAG Encoder - The Code Project - System
		For this purpose, I used my previous article, BCH 21,31, for implementing a BCH Error Correction Code that is part of the POCSAG protocol that we are going to see in the following sections.
		The preamble shown in Figure 2, consists of 576 bits of an alternating 101010 pattern transmitted at a bit rate of 512, 1200, or 2400 bps.
		The data is NRZ, so that mark and space values (plus and minus voltages) as sampled on the output of the receiver discriminator at a 512 Hz rate correspond directly to bits in the codeword starting with the MSB.
	www.codeproject.com /system/POCSAGEncoder.asp (1761 words)

	Pocsag (Site not responding. Last check: 2007-10-12)
		Depending on your on-site POCSAG paging application, the coverage region may either be within your premises (such as a hospital or a mine site) or cover a much greater region such as a small town or county.
		The RelayPage telemetry device is a POCSAG paging receiver; which means it can be used with most on-site paging systems as well as public paging networks.
		Unlike other more expensive coaster pagers, these unique coaster pagers feature an LCD to display the remaining battery life of the coaster pager, indicate how long your patron has been waiting and alert the customer if the restaurant pager is out of range of the transmitter.
	www.commtechwireless.com /pocsag.php (1207 words)

	SALCOM POCSAG Paging Products
		The buttons initiate transmissions to provide numeric, alpha-numeric and tone-only POCSAG paging, enabling a user to call a pager (approximately 2,000,000 codes), append a priority level (1 of 4), and add a numeric or alpha- numeric message.
		The 12-06-0000 is a simple POCSAG 512bps message generator integrated into a serial lead suitable for interface to a SALCOM 11-72 NRZ transmitter or similar.
		No installation is required, simply plug the D9 socket of the 12-06 to a serial port on the computer and the D9 plug to a SALCOM 11-72 NRZ transmitter or similar compatible transmitter.
	www.salcom.co.nz /paging.html (2245 words)

	Paging system migration from one technology to another A system designer must show how either a new system or an old ... (Site not responding. Last check: 2007-10-12)
		Paging formats * POCSAG -- With respect to POCSAG, one preamble for every 30 batches (one event) is an assumed average.
		The warmup time usually is needed when two different formats are used to allow the encoder to combine two different formats or to switch from one to another.
		The total system capacity numbers for POCSAG format in the mixed-page-types system capacity table (Table 6) match published numbers for that particular test case of mixed traffic ratios as released by Motorola in April 1994.
	mrtmag.com /mag/radio_paging_system_migration (2104 words)

	Paging Transmitters
		The PT10000 is designed for large sites who require an extended coverage region (such as a hospital or emergency service).The PT10000 has a standard output power of 100 watts continuous (adjustable 25-100 Watts) – specifically designed to cope with the most rigorous environment.
		The Store and Forward Paging Unit enables a POCSAG message to be decoded and re-transmitted, to extend the range of a paging network.
		By storing a received transmission and re-transmitting the message after a predetermined delay, it is possible to repeat POCSAG data on the same channel or re-transmit it on another frequency.
	www.sedgewall.co.uk /products/transmitters.asp (295 words)

	Pocsag / Super pocsag (Site not responding. Last check: 2007-10-12)
		However, if you wish to decode all POCSAG transmissions you will need to take a tap off your receivers FM Discriminator.
		This is becuase the signal is a DC keyed transmission.
		POCSAG transmitters actually use a +/- 4kHz deviation.
	www.lucabarbi.it /sistemi_uk/pocsag.htm (400 words)

	Paging technology: POCSAG, Golay paging codes Part 2--Although POCSAG paging code remains widely used, Golay sequential ... (Site not responding. Last check: 2007-10-12)
		Paging technology: POCSAG, Golay paging codes Part 2--Although POCSAG paging code remains widely used, Golay sequential code is no longer used in most new system designs.
		The POCSAG digital paging scheme was developed by British Telecom as a standard signaling format in the United Kingdom.
		Battery energy consumption is reduced ("battery-saving") because each pager, after detecting the preamble and synchronizing to the frame sync word, turns off its receiver circuits until the proper frame appears.
	mrtmag.com /mag/radio_paging_technology_pocsag (795 words)

	PowerLogix Software
		A PC to radio interface with adjustable voltage level settings, and PTT output for the radio is used to transfer the Pocsag signal to the radio's data input line.
		The POCSAG Encoder is a Memory Resident (TSR) Program, and encodes text into 512 bps POCSAG data to a selected comport.
		The POCSAG output from the PC's comport is fed via a simple opto-isolator interface circuit, to a radio transmitter.
	www.jaywalk.com /page-u/products.htm (613 words)

	scanning reference (Site not responding. Last check: 2007-10-12)
		Decoding of both numeric and alphanumeric pager data is supported, as is the hex dumping of raw POCSAG codewords.
		For users of PD.exe, the DOS POCSAG decoder, a Windows based companion database shareware program is now available for evaluation.
		POCSAG is a data transmission system used for sending messages to personal pagers.
	www.panix.net /~clay/scanning/paging.shtml (403 words)

	scanning reference (Site not responding. Last check: 2007-10-12)
		Decoding of both numeric and alphanumeric pager data is supported, as is the hex dumping of raw POCSAG codewords.
		For users of PD.exe, the DOS POCSAG decoder, a Windows based companion database shareware program is now available for evaluation.
		POCSAG is a data transmission system used for sending messages to personal pagers.
	www.panix.com /clay/scanning/paging.shtml (403 words)

	IMPROVED BEEP ON BAD DATA FEATURE FOR POCSAG PAGING PROTOCOL
		If two errored POCSAG blocks are received in a row, the page is terminated, but not marked as errored.
		In the case of numeric pages, only 2 bits of data are required to describe the normal 4 POCSAG block maximum length that would normally be used for numeric pages.
		This could easily be encoded in the first "digit" position in the first numeric POCSAG data block (which contains 4 bits and could describe up to 16 blocks in length).
	www.priorartdatabase.com /IPCOM/000008331 (497 words)

	The POCSAG Recommendation
		Note: Means to multiply the address capacity by tens or even thousands of times this figure are known without disturbing pagers conforming to the above.
		POCSAG has decided not to standardize such means until the need to do so is felt.
		The structure of a message codeword is shown in Fig 2.
	www.braddye.com /pocsag.html (1796 words)

	PAGING IN EUROPE
		The features of APOC can be gradually applied to existing POCSAG systems without loss of capacity or incompatibility with existing pagers.
		Pagers use the synchronisation codeword (which has one of several values) to determine if the transmission is POCSAG or APOC, and at which rate.
		Typically the BSR is 100:1 (compared with 5.67:1 for POCSAG) for message delays of less than 4 seconds.
	www.refreq.com /braddye/europe.html (465 words)

	Pager Programming, Monitoring, and Applications (Site not responding. Last check: 2007-10-12)
		POCSAG signalling format description, the good ol' standard that runs 512, 1200 and 2400bps
		IXO protocol (variously known as IXO, PET, and TAP) allows for alphanumeric messages to be transmitted.
		Discriminator_mod - read and learn why it is better to tap received POCSAG data from FM discriminator output instead of using straight audio from scanner.
	www.gadgettech.org /pager (253 words)

	POCSAG Alphanumeric data paging systems
		If you require a simple message paging system with options to expand as and when required, this equipment offers unbeatable value for money.
		These products are very high specification POCSAG format transmitting devices with a huge catalogue of technical specifications.
		If you are looking for other POCSAG transmitter and receiver options we would be pleased to furnish you with specific technical information.
	www.easylinkuk.co.uk /page43.html (376 words)

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