ATM Configuration and Troubleshooting Guide

Supported Standards
UNI Versions
Chapter 12 315
UNI Versions
The ATM adapter complies with UNI 3.0, 3.1, and 4.0, and with the user
part of the specifications.
Physical Layer Standards (SONET and SDH)
The transmission convergence sub-layer of the ATM adapter’s physical
layer can be set to either SONET or SDH. The implementations conform
to the following standards:
• SONET STS-3 (ANSI T1E1.2/94-002R1).
• SDH STM-1 (ITU recommendation G.707, 708, 709, and I.432).
ATM Layer Limitations
The following ATM layer limitations apply:
• The ATM adapter generates only cells with CLP set to 0 (zero). The
CLP bit in incoming data is ignored.
• The GFC bit is always set to 0 (zero) or ignored (for incoming calls).
• The range of VCI and VPI values is as follows (discontinued adapters
are not shown):
— J2469A, J2499A, and J3420B ATM adapters: 11 bits, of which
up to 8 bits can be used for the VPI range.
Examples 0 bits for VPI, 11 bits for VCI
6 bits for VPI, 5 bits for VCI
— J3573A ATM adapters: 12 bits, of which up to 8 bits can be
used for the VPI range.
Examples 0 bits for VPI, 12 bits for VCI
4 bits for VPI, 8 bits for VCI
— A5483A: 12 bits, of which up to 8 bits can be used for the VPI
range.
Examples 0 bits for VPI, 12 bits for VCI