pxf4333 Infineon Technologies Corporation, pxf4333 Datasheet - Page 58

• Manufacturer Part Number: pxf4333
• Description: Abm 3g Atm Buf Fer Manager
• Manufacturer: Infineon Technologies Corporation

3.3.1
In Uni-directional applications, the ABM-3G can be programmed to make a minimum
header translation. This is necessary in a Mini-Switch configuration as both the forward
and backward direction of a connection traverse the devices in the same direction. The
OAM functions in the Infineon ALP (PXB 4350) or AOP (PXB 4340) devices need the
same LCI for forward and backward direction of a connection.
This is clarified by the example shown in
from PHY
connected. The terminal sends ATM cells with this identifier and expects cells in the
backward direction from PHY
direction translates VPI/VCI
the upstream direction. Similarly, for the backward connection from PHY
ALP receives ATM cells from PHY
LCI
Figure 3-13 Connection Identifiers in Mini-Switch Configuration
For minimum complexity, the header translation of the ABM-3G is done by inverting the
Least Significant Bit (LSB) of the LCI. This measure divides the available LCI range into
two parts: odd LCI values for forward connections and even LCI values for backward
connections (or vice-versa). That is, it reduces the available number of connection iden-
tifiers to 8192, because two LCI values are used per connection.
This is not a restriction in the case of arbitrary address reduction modes as, for example,
Data Sheet
2
Phy 1
Phy 2
.
1
LCI Translation in Mini-Switch Configurations
to PHY
VPI/VCI
VPI/VCI
2
2
1
. VPI/VCI
PXB
4350
ALP
HT
HT
HT = Header Translation
LCI = Local Connection Identifier
1
1
LCI
LCI
into LCI
LCI
LCI
2
is the identifier on the transmission line where PHY
1
1
with the same identifier. The ALP in the upstream
2
2
2
with the identifier VPI/VCI
1
4340
AOP
PXB
, the unique local identifier for this connection in
58
Figure 3-13
LCI
LCI
LCI
LCI
1
1
2
2
ABM-3G Uni-directional mode)
in which a connection is set up
2
LCI+/-1
Functional Description
LCI=
and translates them into
Cores
PXF 4333 V1.1
2
to PHY
2001-12-17
ABM-3G
1
, the
1
is