
PXB 4330
Overview
Data Sheet
1-24
09.99
1.5
Nomenclature
Figure 1-6
Nomenclature
Figure 1-6
shows a typical ATM Switch with the following elements:
PHY = Line port.
PHY device = A component (chip) containing the Physical Media Dependent (PMD)
and Transmission Convergence (TC) sublayers of one or several line ports. The PMD
and TC together form the Physical or PHY Layer. The UTOPIA Interface is used for
the interface between the PHY and ATM layers.
UTOPIA = Universal Test and OPerations Interface for ATM, defined by The ATM
Forum in [
1
] and [
2
].
Switch port = In the Infineon ATM switching strategy, performs all ATM Layer functions
except routing.
ATM layer device = Combinations of the chips PXB 4350 E ALP, PXB 4340 E AOP,
PXB 4330 E ABM, and PXB 4325 E ASP as shown for example in
Figure 1-1
. They
perform the ATM Layer functions such as header translation, policing, OAM, traffic
management, etc. and are interconnected with the UTOPIA Interface.
ATM Switching Fabric (ASF) = An array of PXB 4310 E ASM chips; provides space
switching of ATM cells (routing), including buffering of cells for cell level congestion.
Planes 0 and 1 = Two redundant switching fabrics, which are identical.
Incoming/outgoing port = Refers to a connection with the data flow direction as shown
in
Figure 1-6
.
Upstream/downstream = Refers to the ATM switching network; the direction towards
the ASF is upstream, the direction coming from the ASF is downstream.
PHY
device
UTOPIA
interface
SLIF
interface
ATM
switching
fabric
ASF
incoming
Port
outgoing
Port
data flow direction
ATM layer
ATM
layer
device
PHY
device
1
:
:
n
1
:
:
n
Line
port
or
PHY
SLIF
interface
upstream
upstream
UTOPIA
interface
PHY layer
downstream
downstream
plane 1
plane 0
ATM
layer
device
switch port
switch port