1 - SAGEM F@st™ 1000 modem overview
1.6Bearer and transmission mode
1.6.1ADSL
Asymmetric Digital Subscriber Line:
!The conventional telephone line is used to superimpose the transmission of high speed digital signals on the conventional telephone signals.
!Transmission is said to be "asymmetric" because the maximum bit rate received by the user can be up to ten times higher than the maximum bit rate employed by the user.
It is important to remember the following points:
!The real bit rates of your ADSL line will depend on the Quality of Service specified by your Operator and by your Service Provider.
!The telephony and digital transmission services are totally independent and can be used at the same time. In addition, the telephone service does not depend on the state of the SAGEM F@st™ 1000: whether powered up or powered down, whether the data connection is established or not, the telephone service will always be available.
1.6.2ATM
ATM (Asynchronous Transfer Mode) is a transmission technique whereby the flow of data (received in packets of variable length) is segmented into smaller packets of fixed length called cells (53 octets long).
These cells are conveyed from end to end (through the network's various ATM elements) via virtual channels.
Each virtual channel (VC) is defined by two identifiers supplied by the Operator:
!VPI (Virtual Path Identifier)
!VCI (Virtual Channel Identifier).
User Guide - N56815740110
No reproduction or communication without the written consent of SAGEM SA | Page |
