what the distance that PSTN（Public Switched Telephone Network） work? min and max length?
457823
First there is no minimum distance, I can stand right in the exchange next to the switch and have a perfectly functioning telephone.  Maximum distance depends on a number of factors such as the quality of the cable connecting you to the PSTN switch and the type of telephone you use (analog or digital).  Analog telephones should work assuming decent cable and sufficient amplifiers in the system at distances of 20 miles from the PSTN switch.  However some of the new features such as call display will not work at these distances.  In most systems digital telephones will not work at distances greater that 3 or 4 miles from the main switch. Due to the variables mentioned above and others such as the  specific equipment being used or the prescence of repeaters in the path these are ballpark numbers only.  The acid test for a particular situation is to connect a phone and find out whether it operates or needs additional equipment to function.  The final answer is that a phone can be made to work at any distance from the Central office given enough money and specialized additional equipment.
676628
Depends on PSTN network you have, That PSTN switch should have an extension for VoIP and you have to see if those analogs are compatible with PSTN. Please reply with more details.
989097
Some routing software allows such a limit\n\nYou will probably need to have a linux based router though and spend some time configing it
870597
A lot, though it's hard to measure.\n\nYou can't do it by connections to the server because some people use more than one protocol at a time (I use MSN, Skype, AIM, ICQ and Yahoo).\nYou can't do it by IP connections either, because to the outside world each LAN has only one IP, but may have hundreds of thousands of IM users behind it.
322109
the bit time is 100ns\nthe slot time is 51.2us
653758
Quezon City Metro Manila -------> 2 \nhttp://en.wikipedia.org/wiki/Communications_in_the_Philippines
370212
Simple. Grab a stopwatch. Go outside. Yell, and measure the time for the echo to return to you.  Now, use the formula Mach*T/2 to find your distance from the wall.\n\nBeyond that, the Joint Spectrum Center & FCC probably have issues.
963015
C:&#92;>ping yahoo.com  <--what you are pinging\n\nPinging yahoo.com [216.109.112.135] with 32 bytes of data: <--the address was found at 216.109.112.135, now let's start pinging\n\nReply from 216.109.112.135: bytes=32 time=17ms TTL=45  <--The website replied from that IP address.  You sent the site 32bytes of data to test with.  The reply took 17ms (milliseconds) to get back to you.  TTL isn't important here.\nReply from 216.109.112.135: bytes=32 time=18ms TTL=45\nReply from 216.109.112.135: bytes=32 time=19ms TTL=45\nReply from 216.109.112.135: bytes=32 time=18ms TTL=45\n\nPing statistics for 216.109.112.135:\n    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),  <-- you sent 4 packets and all were answered successfully.\nApproximate round trip times in milli-seconds:\n    Minimum = 17ms, Maximum = 19ms, Average = 18ms  <---self explanatory.\n\nIf you want to ping a site "forever", use:  ping whatever.com -t\n\n...where whatever.com is the real site you want to ping.
302813
SDSL often goes farther than ADSL but is more expensive. If that doesn't reach either, you should check cable or satellite.
1046648
No,actually a 56k is a53.3K connection since that is the speed that the FCC limits you to, on top of that most dialup users actually connect in the 40,000 – 50,000K range, which is excellent by dialup standards. Being that you actually connect in the 40-50K range you need to understand that your maximum throughput is only going to be around 6 kilobytes per second!!!
772488
If you mean on regular POTS (plain old telephone system), you must have a V.92 modem, AND using an ISP that supports V.92 interrupt, AND have call waiting. As for HOW you answer, that would depend on the modem.
885553
It depends.  The rate they sell you is not the rate you will always get.  You could have a 20mbps connection and depending on certain variables (cable or dsl, distance from provider, computer hardware, etc) you won't get that full 20mbps.  As a general rule of thumb, you never get the full amount of speed you are supposed to be able to get.  Yes, that is a fast connection and definitely fast enough to hook your psp to.  Want to check what you're really getting?  Look up the "Speak Easy" test on yahoo.
526068
I think this is possible as I've had once installed aironet series antenna it gave me a range of about 15 miles and more the distance less the bandwidth. I'm not sure if it is possible to get the whole 54Mbps at that range maybe you'll get about 2Mbps at max if we are very generous. Moreover it's not the device but the antenna used with the device that gives the range. To know what I am talking about just visit this following link:\nhttp://www.cisco.com/en/US/products/hw/wireless/ps469/products_data_sheet09186a008022b11b.html
872740
Hi there,\n\nIf it is a Dial up modem then:\n\n1. Start > Control Panel > Phone and Modem options > Modem Tab > Properties > Modem Tab again > Select 57600 as Port speed since 115200 gives a pseudo connection speed resulting in slow connections. Click OK and close all the windows. Restart your system.\n\n2. Check with your ISP/Telephone company for any AT Strings required.\n\n3. Remove any Fax / Answering machine from the same line.\n\n4. Avoide to use cable more than 2-3mts long.\n\n\nHope this helps...\n\nArash Shirali...
1732
To the best of my knowledge, there's no theoretical bottom limit to the speed of an internet connection, although individual programs may give up after a period of time, and assume that the message they were trying to send has been lost in transit.\n\nTo illustrate this, I've linked the (as far as I know, unused) proposal for transmitting IP packets (one of the fundamental units of data on the internet) via trained pigeons.\n\nWhile the attached proposal is certainly geek-humor, I hope it illustrates my point - as slow as your net is, it could always get even slower.
629468
If you have a general web based e-mail facility (ie can be accessed from any computer in your home country), then it doesn't matter if you are accessing it from Barnsley or from Khopra ridge in Nepal - 2 days walk form the nearest road (as I did recently), it still works the same.\n\nSo, in a word, no. It will work fine. So long as you know how to access it from the general internet (instead of through just your machine).
676226
It can very with line distance from source and city and line noise and modem the quality of ISP"s equipment\n\nMost people get between 19.2  and 53.3\n\nIf you're in a city you should be getting above 40.0\n\nTo check to see if you have alot of line noise pickup the phone and dial number 1 to clear dial tone if you hear a bunch of line noise it will probably make your connection on the slow side ,if you only hear silence it you should get a faster connection..