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| hz21ic Tl Posts: 1 China | Posted - 7/6/2004 8:33:08 PM    Hello every one, I am using Z02922 to designe a leased line modem, but when I use a "dry" copper to link the two modem directly, neither call tone or answer tone can be detected in both side, can you tell me what's the main defference between a dial up modem and a leased line modem? For a leased line modem design, If it has special requirement for the modem data pump hardware? Never give up! |
| v.Richard Tl Posts: 6222 USA | Posted - 7/7/2004 1:09:35 AM  A dial-tone line will have battery (DC) voltage on it full time; a leased line may or may not depending upon the type of leased line. Some dial-up modems require the DC line voltage to be present; some do not, although almost all modern dial-up modems will by default attempt to detect dial-tone and fail to connect unless you disable dial-tone detection. In most cases, if the modem doesn't have an electro-mechanical DAA (a relay to put modem on/off hook), the DAA will be telco-line powered. Aloha! Richard. |
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