Nortel 450-24t 用户指南
ATM Overview
309978-D Rev 01
D-9
Virtual Ports
Your BayStack 450-2M3/2S3 MDA has two physical OC-3 ports (A1 and A2) that
are used to connect to an ATM switch. As shown in Figure D-4, both physical
ports are logically mapped to four LEC virtual ports (VPorts), LEC1 to LEC4.
are used to connect to an ATM switch. As shown in Figure D-4, both physical
ports are logically mapped to four LEC virtual ports (VPorts), LEC1 to LEC4.
Figure D-4.
Virtual and Physical Ports
During initial powerup, your switch assigns the VPorts as a continuation of the
default port numbering within the CI menus and screens. For example, if you have
a 12-port switch, VPorts LEC1 to LEC4 are assigned port 13 to port 16. For
24-port models, the VPorts are assigned port 25 to port 28.
default port numbering within the CI menus and screens. For example, if you have
a 12-port switch, VPorts LEC1 to LEC4 are assigned port 13 to port 16. For
24-port models, the VPorts are assigned port 25 to port 28.
450-2M3/2S3 MDA
LEC
Virtual ports
Physical ports
A1
Rx
Tx
A2
Front
LE
C
C
1
LE
C
C
2
LE
C
C
3
LE
C
C
4
BS45090A
Rx
Tx