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7
Configuring an E_Port Extension over an ATM WAN
7-15
Configuring a 1x1 ATM Wide Area Network
enabled VCI values are in the range of 0 to 2047. The values of
3 and 4 are reserved for Operations and Management (OAM)
traffic. A value must specified, there is no default value.
c. Check the box to Enable POS (Packet over SONET) for the
ATM interface.
This enables the direct encapsulation of packets via SONET
framing. POS uses PPP to encapsulate the data. POS is
disabled by default.
If enable Packet Over SONET (POS) for this ATM interface,
the Virtual Path ID (VPI) and Virtual Channel ID (VCI) fields
on this dialog box will be disabled, because the ATM protocol
does not use the VPI and VCI for POS.
d. Select the Quality of Service from the drop-down menu.
• CBR - (Constant Bit Rate)
• VBR - (Variable Bit Rate)
• UBR - (Unspecified Bit Rate)
NOTE: McDATA recommends using CBR for ATM implementations. The
best performance obtained during testing was with Constant Bit Rate (CBR).
e. Select either the 10
3
cells/sec or the 10
6
bits/sec cell rate.
•Select 10
3
cells/sec to enter the Peak Cell Rate and
Sustained Cell Rate values in Kcells per second.
•Select 10
6
bits/sec to enter the Peak Cell Rate and Sustained
Cell Rate values in Mbps.
Switching between the 10
3
cells/sec and 10
6
bits/sec buttons
will toggle the entered values between the Kcells per second
and Mbps per second formats. The 10
3
cells/sec option is the
default selection, so when you reopen the dialog box, the 10
3
cells/sec option will be selected.
Active VCI Bits Value Valid Enabled VCI Values
12 Zero through 4095
11 Zero through 2047
10 Zero through 1023
4 Zero through 15