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1-12 Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1
Chapter 1
* Note: 802.1p packets that are received with a tag priority of 0
on a 50 series L2 (non-routing) module, but which must
be routed via the FORE path on an 80 series supervisor,
will be queued and transmitted with a priority of 4.
Refer to the "Routing with Layer 2 and Layer 3
Modules" section later in this chapter for more
information. This is due to the conversion from the
high/low priority system that is used on 50 series
modules to the 8-level priority system that is used on 80
series modules.
ATM Uplink
Module
There are four variations of the ATM Uplink module:
■ 2 port Synchronous Optical NETwork (SONET)/
Synchronous Digital Hierarchy (SDH) OC-3c/STM-1 Single
Mode Fiber (SMF)
■ 2 port SONET/SDH OC-3c/STM-1 MMF (MultiMode Fiber)
■ 2 port SONET/SDH OC-12c/STM-4c SMF
■ 2 port SONET/SDH OC-12c/STM-4c MMF
Each module has two physical interfaces that are capable of being
active simultaneously.
The major features of the ATM Uplink module are:
■ LANE V2 Client - with LANE 1 compatibility, supports 128
interfaces
■ QoS (Quality of Service) support for UBR, nrt-VBR, rt-VBR,
and CBR
■ ATM UNI (User-to-Network Interface) V 3.0, 3.1 and 4.0
signaling
■ RFC 1483 support
■ ILMI (Integrated Local Management Interface) Version 4.0
■ PNNI (Private Network - to - Network Interface) non-transit
■ Link Failover
■ Spanning Tree
* Note: All ATM protocols are ATM Forum standard.
Refer to the Avaya P550/P550R Switch ATM Uplink Configuration Guide
for more detailed information.