130 lines
4.9 KiB
Plaintext
130 lines
4.9 KiB
Plaintext
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White Paper: Cellular Direct Connect
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AT&T Paradyne
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8545 126th Ave N.
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Largo, Fl 34635
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800-482-3333 (or 813-530-8623)
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How do I connect a modem to a cellular phone?
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=============================================
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There are two primary ways of connecting a modem to a cellular phone:
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1. RJ11 Adapter Box
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2. Direct Connect Cable
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Each of these is described below.
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1. RJ11 Adapter Box
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Modems are designed to interface to the PSTN (Public Switched
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Telephone Network -- the "dial" network.) As such, they require call
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progress and signaling information from the telephone company Central
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Office (CO). Examples of these signals are: off-hook indication to the
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CO, dial tone from the CO, touch tones to the CO, etc.
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Cellular phones do not provide this signaling information required by
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the modem. They provide their own proprietary interface, which has
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been designed for cellular phone accessories (hands-free kits, etc.)
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A special adapter box can be placed between the modem and the
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phone. This box is called an "RJ11 Adapter Box". (The name comes
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from the "RJ11" connector that the modem plugs into for PSTN
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operation.) This RJ11 Adapter Box provides the necessary conversion
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between the signals required by the modem and the signals required by
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the cellular phone.
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2. Direct Connect Cable
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RJ11 Adapter Boxes are necessary because regular dial modems were
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never meant to be connected to cellular phones. Conversely, a modem
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with Direct Connect is designed from the start to interface to the
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cellular phone -- all the necessary mechanical, electrical, and software
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"hooks" are included in the modem. Thus, the interface between the
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modem and the phone is nothing more than a simple cable (the "Direct
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Connect Cable").
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Since users will also want to connect to the PSTN, Direct Connect
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modems usually have two connectors:
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1. A PSTN connector for the dial network
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2. A Direct Connect connector for interfacing to the cellular phone
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What are the advantages of Direct Connect?
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==========================================
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Direct Connect offers numerous advantages over RJ11 Adapters:
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1. Less Clutter
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A Direct Connect Cable is much less cumbersome than the extra box and
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cables required for RJ11 Adapter Boxes. When you are mobile, the less
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equipment you have to carry the better.
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2. Less Cost
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RJ11 Adapter Boxes usually cost over $300. This is typically more than
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the price of the modem or the phone! Direct Connect Cables for AT&T
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Paradyne modems are usually priced around $50 (slightly more for certain
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phones).
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3. No batteries
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RJ11 Adapter Boxes require a battery. (RJ11 Adapter Boxes for 3-W
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phones usually are powered from the phone.) This battery usually has a
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short life -- and is prone to fail at the worst time! A Direct Connect Cable
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requires no batteries.
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4. Better Performance
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Direct Connect offers a "cleaner" audio interface to the phone -- higher
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speeds and greater connection reliability is obtained.
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Where do I connect to the phone?
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================================
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Handheld phones usually have a connector on the bottom of the phone.
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Three watt phones (mobile and transportable) require a "T" connector that
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allows the handset and modem to plug together into the transceiver.
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What about PCMCIA vs. Pocket Modems?
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====================================
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AT&T Paradyne offers Direct Connect with its KeepInTouch PCMCIA
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modem. A PCMCIA modem coupled with a Direct Connect Cable is the
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best alternative for mobility. Compare this to a Pocket Modem with an
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RJ11 Adapter Box:
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1. Clutter
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PCMCIA Modem + Direct Connect Cable
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vs.
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Pocket Modem + RS232 cable + Pocket Modem charger + RJ11 Adapter Box
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+ RJ11 Adapter Box Charger + Extra cables between the pieces
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2. Batteries
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Try maintaining four devices with batteries -- the Computer, the Cellular
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Phone, the RJ11 Adapter Box, and the Pocket Modem -- long enough to
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make a cellular call!
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What phones are supported by AT&T Paradyne?
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===========================================
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While several other modem manufacturers support a limited number of
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phones, the AT&T Paradyne KeepInTouch card supports the widest
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variety of phones in the industry.
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The following is the current list of phones supported by the KeepInTouch
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card. This list is constantly being updated as new phones are added -- call
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AT&T Paradyne at 800-482-3333 for the latest list.
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AT&T 3610, 3710, 3730, 3760, 3830, 3850, 6650
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Nokia 121, PT128, 232, 2120
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Technophone 415, 515, 815
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NEC P110, P120, P180, "TalkTime" series
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Many phones are "private labeled" with the name of the Cellular Service
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Provider. If you have a phone labeled as such, contact your Cellular
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Service Provider to see if your phone is on this list.
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