The data is transmitted in so-called cells or slots of constant size. Each cell consists of 48
bytes of usage data and 5 bytes of control information. The control information contains,
amongst other things, the ATM address which is similar to the Internet address. The ATM
address is made up of the Virtual Path Identifier (VPI) and the Virtual Connection Identifier
(VCI); this identifies the virtual connection.
Various types of traffic flows are transported over ATM. To take account of the various de-
mands of these traffic flows on the networks, e.g. in terms of cell loss and delay time, suit-
able values can be defined using the service categories. Uncompressed video data, for ex-
ample, requires different parameters to time-uncritical data.
In ATM networks Quality of Service (QoS) is available, i.e. the size of various network para-
meters, such as bit rate, delay and jitter can be guaranteed.
OAM (Operation, Administration and Maintenance) is used to monitor the data transmission
in ATM. OAM includes configuration management, error management and performance
measurement.
17.2.1 Profiles
A list of all ATM profiles is displayed in the WAN->ATM->Profiles menu.
If the connection for your Internet access is set up using the internal modem, the ATM con-
nection parameters must be set for this. An ATM profile combines a set of parameters for a
specific provider.
By default an ATM profile with the description -0(:2@-(. is preconfigured. Its values
(VPI 1 and VCI 32) are suitable for a Telekom ATM connection, for example.
Note
The ATM encapsulations are described in RFCs 1483 and 2684. You will find the
RFCs on the relevant pages of the IETF (www.ietf.org/rfc.html ).
17.2.1.1 New
Choose the New button to set up new ATM profiles.
17 WAN Teldat GmbH
304 bintec Rxxx2/RTxxx2
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