Frame Relay-To-Atm Service Interworking; Figure 2-13 Bpx 8600 Series Network With Siw Connections - Cisco MGX 8230 Installation And Configuration Manual

Frame Relay Service Modules
Frame Relay–to–ATM Direction
EFCI is always set to 0.
ATM–to–Frame Relay Direction
If the EFCI field in the last ATM cell of a segmented frame received is set, then FECN of the Frame
Relay frame will be set.
PVC Status Management
The management of ATM layer and FR PVC status management can operate independently. The PVC
status from the ATM layer is used when determining the status of the FR PVC. However, no direct
actions of mapping LMI A bit to OAM AIS is performed.

Frame Relay-to-ATM Service Interworking

By specifying "service interworking" as the channel type when adding a Frame Relay PVC to an FRSM,
all PVC data is subject to service interworking translation and mapping in both the Frame
Relay–to–ATM and ATM–to–Frame Relay directions.
connections.

Figure 2-13 BPX 8600 Series Network with SIW Connections

ATM FUNI CPE
ATM UNI CPE
In Figure
an FRSM. Three far-end terminations for these connections appear in other parts of
•
•
•
In addition to frame-to-cell and DLCI-to-VPI/VCI conversion, SIW maps cell loss priority and
congestion data between the Frame Relay and ATM formats and is FRF.8-compliant. It provides full
support for routed and bridged PDUs, transparent and translation modes, and VP translation.
Cisco MGX 8230 Edge Concentrator Installation and Configuration
2-24
T1 or E1
FRSM
RPM
T1 or E1
2-13, an MGX 8230 node on the right has three Frame Relay SIW connections terminating on
ATM FUNI (framed UNI) port on an FRSM
ATM UNI port on an RPM
ATM UNI port on a BPX 8600 series BXM card
Figure 2-13
BPX 8620 network
MGX 8850
PVCs
BPX 8620
B
X
M
T3, E3, OC3
ATM-UNI CPE
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Chapter 2 Module and Service Descriptions
is an illustration of typical SIW
MGX 8850 FRSM
Figure
FR UNI
CPE
2-13: