Avaya Configuring ATM Services Manual de usuario Pagina 88

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Configuring ATM Services
5-4 114056 Rev. A
Enabling or Disabling Cell Payload Scrambling
Some ATM network equipment can exhibit sensitivity to certain bit patterns (for
example, 101010... or 000000...). This sensitivity can cause problems in the ATM
network. Setting the Scrambling feature to Enable (the default setting) randomizes
the bit pattern in the cell payload sufficiently to guarantee cell synchronization.
Though some equipment may have the ability to operate with scrambling
disabled, we recommend that you scramble the cell payload.
Enabling or Disabling Loopback
By default, Loopback is disabled on an ATM line. Enabling the Loopback feature
initiates loopback diagnostic mode. In loopback mode, the router retransmits
received data back to the sender over the same ATM line.
We recommend that you only enable Loopback when trying to diagnose a
problem with the ATM line.
Defining ATM Cell Insertion
An ATM line is never idle. In the absence of user cells, the ATM framer device
must fill the idle bandwidth. The Cell Insertion feature allows you to define
whether you want unassigned cells (the default selection) or idle cells.
Idle cells are only visible at the physical layer. Unassigned cells are not only
visible at the physical layer (which treats them as standard ATM cells), but also at
the ATM layer.
Note: ATM devices with different scrambling settings cannot communicate.
For example, if you configure a router to enable scrambling, and configure a
hub to disable scrambling, the router and hub cannot communicate.
Site Manager: Scrambling: page A-7
Site Manager: Loopback: page A-8
Site Manager: Cell Insertion: page A-8
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