Chapter 11: ATM Cards
ATM Cell Header
150 SmartBits System Reference
ATM Cell Header
Application
Supported:
SmartWindow.
The ATM cell header includes the ATM address of the PVC. The VCI and VPI portion can
represent either hexadecimal or decimal. The default is hexadecimal.
The ATM header contains the following fields:
• GFC 4 bits (Range 0-15).
• VPI 8 bits (Range 0-255) for UNI.
• VPI 12 bits (Range 0-4095) for NNI.
• VCI 16 bits (Range 0-65535).
• PTI 3 bits (Range 0-7).
• CLP 1 bit (Range 0-1).
Cell Header in
ATM Stream s :
In SmartWindow, the contents of the ATM cell header is only available for PVCs and is
specified in the ATM Transmit Setup window. The VCI and VPI portion can represent
either hexadecimal or decimal. The default is hexadecimal. You can modify the
smartbit.ini file to change it to represent a decimal value.
To change the VCI and VPI portion of the cell header to represent decimal instead of
hexadecimal, enter the following line in the smartbit.ini file under the Preferences:
ATM VPI/VCI HEX=0
If you change the value to 1, it represents hexadecimal.
Cell Header, Idle: If you select the Line Parameters window for an ATM card in SmartWindow, you can
specify the header contents ( 4-bytes in hexadecimal) of the ATM idle cell payload (the
first four bytes of the header) that is transmitted when no data cells are being transmitted.
SmartWindow calculates the HEC byte for the specified header internally.
For the AT-9622/9622s OC-12c SmartCard, enter only idle cells with the VPI/VCI fields
set to zeroes.
To Next Page
Loading...