3Com CoreBuilder 3500, Implementation Manual, Page: 65 / 592

Examples of Port Numbering 65
Example 4: FDDI
Module with Other
Modules
An FDDI module has six FDDI ports (two rows of three ports). Figure 9
shows an FDDI module in slot 1. The top row’s ports are numbered 1
through 3 and the bottom row’s ports are numbered 4 through 6. Slots 2
and 3 have 10/100 Fast Ethernet modules, and Slot 4 has a Gigabit
Ethernet module.
When two FDDI ports are configured as a dual-attach station (DAS) pair,
there is one bridge port using two physical (fiber) connectors. The anchor
port is the A-port of the DAS port pair. If you configure two FDDI ports as
a DAS pair, you must specify the lowest-numbered (anchor) port in the
DAS pair and the other port in the pair becomes unselectable.
For example, for the FDDI module shown in slot 1, the three configurable
DAS pairs have ports 1 and 4, ports 2 and 5, and ports 3 and 6. When
specifying bridge ports (for example, for VLANs), you specify port 1 to
represent the first DAS pair, port 2 to represent the second DAS pair, and
port 3 to represent the third DAS pair. For more information about FDDI
configurations, see Chapter 6.
Figure 9 Port Numbering for a System with an FDDI Module
RUN SY INS PS PS FA
R N S
TEMP SERVIC
INS
PCMCI
MODEM
TERMINAL
ETHERNET
10BT
1X
L E T 2X
L E T 3X
L E T 4X
L E T 5X
L E T 6X
L E T
PWR
ERROR
100 BASE - TX
3C54321
PWR
INS
ERR
R
1X
L E T 2X
L E T 3X
L E T 4X
L E T 5X
L E T 6X
L E T
100 BASE - TX
3C54321
PWR
INS
ERR
1000 BASE (GBIC)
3C35330
FDDI MMF
3C35410
PWR
INS
ERR
L
E
T L
E
T L
E
T
L
E
T L
E
T L
E
T
A1 A2 A3
B4 B5 B6 PWR
INS
ERR
L
E
T
Slot 4
(Gigabit Ethernet
port 19)
Slot 3
(10/100 ports 13-18)
Slot 2
(10/100 ports 7-12)
Slot 1
(FDDI ports 1-6)