Robotics Sportster Flash x2 Manual de usuario descargar pdf (Pagina 2)

converted to digital and sent through the carrier’s network, the call stays digital until it

reaches a U.S. Robotics server modem through a T1, PRI or BRI circuit.

2. x2 support at both ends.

x2 must be supported on both ends of the connection -- by the client modem as well as

by the remote access server or modem pool at the host end. Typically, the remote user

will be using a U.S. Robotics Sportster, Courier, or Megahertz modem dialing into an

MP I-modem, NETServer I-modem, Courier I-modem, or Total Control Enterprise

Network Hub remote access server.

3. Only one analog section.

There can only be one analog section in the phone network along the path of the call

between the x2 server modem and the client's modem, and it should be at the client’s

local loop. If the digital connection at the server side is channelized T1, it must be

"trunk-side" and not "line-side." With line-side service from the phone company, there

typically is an additional analog section (this limitation is described below).

Essential Components of an x2 Connection: Digital at One End, x2 at Both Ends, and

Only One Analog Section.

The Telephone Network

The analog telephone network is designed primarily for voice, not data. Many tradeoffs

must be balanced when implementing a telephone network, and decisions are often --

and should be -- made with providing reliable and efficient voice service as the primary

focus. Data traffic often benefits from these efficiencies, but there are circumstances

where certain equipment is employed that is perfectly logical for voice, yet interferes

with high-speed data transmission.

Let’s assume that the first two requirements of x2 are met -- one end of the connection is

digital and both ends support x2 -- and focus on the third requirement.

x2 technology is based on the assumption that there is only one analog section in the

path between the analog modem and the x2 digital host equipment. This analog-to-

digital converter (ADC, or codec) is commonly found at the local switching office where

the subscriber’s analog line is attached to the telephone switching equipment. From that

point on, it must remain digital all the way to the x2 digital host equipment. There are

two parts of the path where additional analog sections may occur:

1. The local analog loop between your modem and the switching office

As mentioned above, a typical situation is where the line remains analog from the

analog modem to the local switching equipment. It is also common for some of the

circuits to be provided over digital circuits (such as over T1/E1 circuits or fiber) to

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Robotics Sportster Flash x2 Manual de usuario Pagina 2