Avaya a500 사용자 가이드
Cajun A500 ATM Switch Overview
Cajun A500 ATM Switch User Guide
1-5
Data Flow
The data and control flow in this architectures are shown in Figure 1-2.
Figure 1-2: Software Architecture - Major Data and Control Paths
The following steps explain how ATM cell traffic is passed through an Cajun A500
switch:
1. ATM cells from the ATM ports are stored in the cell memory under the switch
fabric control.
2. ATM cells are either forwarded to another ATM port at the line speed or to the
SAR, if circuit terminates locally (Signaling/Routing Engine, etc.).
3. The Segmentation And reassembly (SAR) reassembles the cells to a Protocol Data
Unit (PDU) and notifies the appropriate local task.
ATM
Switch
Te ln e t
T FT P
S N M P
A g e n t
T ra p
/
N o tify
S w itc h
M o n /C trl
Ta sk
C o n so le
D U A RT
D riv e r
E th e r
D riv e r
U N I/P N N I S ig n a lin g
Ta sk
Ta sk
C a ll C o n tro l
L o c a l
S e rv ic e M g t.
LEGEND
Data
Control
S A R
L A N E
C lie n t
P N N I R o u tin g
Ta sk
C h a ssim o n
TA S K
TA S K
Snooping
Task
Task
Switch Driver
To
Ethernet
Ethernet
PPP
P N A (IP )
To
Modem
Modem
MAKER
SWP
B U S
ILMI
Task
Task