Beta Draft Confidential
About ATM Logical Ports
VPs and VCs
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/052-15
Table 2-4. Number of Valid Bits in VPI/VCI for GX 550
If Number of Valid
VPI Bits =
a
a
Only 8 bits of the VPI are available on UNI type interfaces per ATM Forum standards.
Valid VPI Range
Is
If Number of
Valid VCI Bits =
Valid VCI Range
Is
b
b
VCI 0 - 31 are reserved and should not be used for user traffic per ATM Forum standards.
000Not Valid
10 - 11Not Valid
20 - 32Not Valid
30 - 73Not Valid
4 0 - 15 4 Not Valid
5 0 - 31 5 Not Valid
6 0 - 63 6 32 - 63
7 0 - 127 7 32 - 127
8 0 - 255 8 32 - 255
9 0 – 511 9 32 - 511
10 0 – 1023 10 32 - 1023
11 0 – 2047 11 32 - 2047
12 0 – 4095 12 32 - 4095
Not Valid – 13 32 - 8191
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