Functional Planes; User Plane; Control Plane - 3Com CoreBuilder 9000 User Manual

312 C 10: ATM N
HAPTER

Functional Planes

User Plane

Control Plane

B
ETWORK ASICS
In addition to the ATM layers described previously, functional planes
describe the integration between user and management devices. Figure 6
shows the relationship between the ATM layers and the functional
planes.
UNI Functional/Protocol Model
Figure 6
C o n tro l P la n e
S ig n a lin g
H ig h e r L a y e rs
Transfers data for a user application between the devices. User
application refers to a high-level (higher than ATM) data transmission
format such as Ethernet data transmission, Frame Relay data
transmission, or video data transmission. The UNI translates the user
application format to ATM format while ensuring the required quality of
service. LAN Emulation is the primary UNI service operating on the User
Plane in the CoreBuilder 9000 ATM Enterprise ATM Switch; it transfers
Ethernet frames across ATM devices. See Chapter 15 for details about
LAN Emulation.
Establishes the connections required for a call passing between the two
devices. This includes the signaling procedures for establishing a switched
virtual channel.
M a n a g e m e n t P la n e IL M I
U se r P la n e L A N
E m u la tio n
H ig h e r L a y e rs
A T M A d a p ta tio n L a y e r
A T M L a y e r
P h ysica l L a y e r