3Com 10-Port 100BASE-FX User manual

10-Port 100BASE-FX and
20-Port 10/100BASE-TX
Fast Ethernet Layer 2
Switching Modules
Quick Start Guide
For the CoreBuilder®9000 Enterprise Switch
Module Descriptions This guide describes key installation information for two
CoreBuilder®9000 Fast Ethernet (FEN) Switching Modules:
■The 10-port 100BASE-FX Fast Ethernet Layer 2 Switching Module
(Model Number 3CB9LF10MC) has ten 100 Mbps Ethernet fiber-optic
ports with SC connectors on its front panel and two 1-Gigabit ports
on the back for connection to the chassis backplane.
■The 20-port 10/100BASE-TX Fast Ethernet Layer 2 Switching Module
(Model Number 3CB9LF20R) has twenty 10/100 Mbps RJ-45 ports on
its front panel and two 1-Gigabit ports on the back for connection to
the chassis backplane.
Each of these FEN Switching Modules operates as a Layer 2 switch and
occupies a single switching module slot in the CoreBuilder 9000 7-slot
chassis, 8-slot chassis, or 16-slot chassis.
Key Features The 10/100BASE-TX and 100BASE-FX FEN Switching Modules support
the following key features:
■Hot-swapping of modules
■Management using the Administration Console
(a command line interface), the Web Management suite of
applications with an Internet browser, or SNMP-based applications

210-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
For information about the software features that these modules support,
see the:
■CoreBuilder 9000 Implementation Guide
■Command Reference Guide
■CoreBuilder 9000 Release Notes for the Fast Ethernet and Gigabit
Ethernet Layer 2 Switching Modules
Front Panel On the 10-port 100BASE-FX FEN Switching Module, the front panel ports
are numbered 1 through 10, as shown in Figure 1. The two 1-Gigabit
ports on the back of the module (not shown in Figure 1) are numbered
11 and 12.
On the 20-port 10/100BASE-TX FEN Switching Module, the front panel
ports are numbered 1 through 20, as shown in Figure 1. The two
1-Gigabit ports on the back of the module (not shown in Figure 1) are
numbered 21 and 22.
Figure 1 Front Panels for the 10/100BASE-TX and 100BASE-FX FEN Modules
In the 7-slot chassis, you install the modules horizontally with the LEDs at
the left. In the 8-slot chassis and the16-slot chassis, you install the
modules vertically with the LEDs at the top.
3CB9LF10MC
TX
RX
1
2
1
TX
RX
MOD STAT
2
3
4
6
7
8
9
5
10
TX
RX
3
TX
RX
4
TX
RX
5
TX
RX
6
7
TX
RX
TX
RX
8
TX
RX
9
TX
RX
10
3CB9LF20R
1
MOD STAT
2
3
4
5
6
7
14
1X
2X
3X
4X
5X
6X
7X
8X
9X
10X
11X
12X
13X
14X
15X
16X
17X
18X
19X
20X
3CB9LF20R
1
MOD STAT
2
3
4
5
6
7
14
1X
2X
3X
4X
5X
6X
7X
8X
9X
10X
11X
12X
13X
14X
15X
16X
17X
18X
19X
20X
Model number
Ejector handle
Module Status LED
Port Status LEDs
RJ-45 ports
Ejector handle
Module Status LED
Port Status LEDs Fiber-optic ports
(SC connectors)
100BASE-FX
10/100BASE-TX

10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 3
Audience Description This guide is intended for trained technical personnel only. Do not
attempt to install, remove, or replace the 10/100BASE-TX or 100BASE-FX
FEN Switching Modules if you have not had the proper training from
3Com. For training information in the United States and Canada, call
1-800-NET-3COM. For the numbers to call in other locations, visit the
3Com Web site:
www.3Com.com/support/
Safety Precautions When you handle components in a CoreBuilder 9000 system, be sure
that you follow all safety precautions. To avoid electric shocks, burns, or
equipment damage, read and follow these warnings:
WARNING: Allow only trained service personnel to install, remove, or
replace any module in the chassis.
WARNING: Hazardous energy exists within the system. Use extreme
caution when you install, remove, or replace any module in the chassis.
When the system is on:
■Never insert metal objects such as a screwdriver or a finger with
jewelry into open module slots.
■Do not touch any connections within the chassis with your hands or
fingers.
WARNING: To ensure optical safety when installing a FEN Switching
Module, comply with the following precaution:
Although the data communication LEDs used in this product meet the
regulatory requirements for casual exposure to the eye, as with any
source of bright light, it is advised that you do not look into the light
source.
LED Safety Information: IEC 825 and EN60825, Class 1 LED Device. For
connection only to Class 1 LED Devices.
CLASS 1
LED PRODUCT

410-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
ESD Safety Information
Electrostatic discharge (ESD) can damage components of the module.
ESD, which occurs when a module is improperly handled, can cause
complete or intermittent failures.
CAUTION: To prevent ESD-related damage:
■Always wear an ESD wrist strap (not provided) when you handle a
module, ensuring that the strap makes good skin contact and is
properly grounded.
■Keep the module in its antistatic bag until you are ready to install it.
Handling Precautions When you handle a module, follow these precautions:
■Always handle the module by the front panel only.
■Do not touch the components, pins, leads, or solder connections.
■Do not twist or otherwise force the module into the chassis when you
insert it into the module guides.
■Before you push the module into the chassis, verify that the module
ejector handles are open.
■When you slide the module into the 7-slot chassis, match the left and
right module guides. In the 8-slot chassis or 16-slot chassis, match the
upper and lower module guides.
For details, see “Installation Prerequisites” and “Installing the Module”
later in this guide.

10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 5
Unpacking
Instructions
Use the following procedure when you unpack a FEN Switching Module:
1Verify that the module is the correct product by matching the 3C number
that is listed on the shipping box label to the 3C number that you ordered
(Model Number 3CB9LF10MC for the 10-port 100BASE-FX Fast Ethernet
Layer 2 Switching Module or Model Number 3CB9LF20R for the 20-port
10/100BASE-TX Fast Ethernet Layer 2 Switching Module).
2Remove the module, in its antistatic bag, from the shipping box.
3Observing the caution instructions, remove the module from its antistatic
bag and inspect it for physical damage.
CAUTION: Handle the module only by the front panel. Do not touch any
components, pins, leads, or solder connections.
If the module appears to be damaged, replace it in the antistatic bag, put
it back in the shipping box, and contact your network supplier.
4Verify that the box also contains:
■CoreBuilder 9000 Release Notes for the Fast Ethernet and Gigabit
Ethernet Layer 2 Switching Modules
■10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet
Layer 2 Switching Modules Quick Start Guide for the
CoreBuilder 9000 Enterprise Switch (this guide)
If the listed contents are not in your shipping box, contact your network
supplier.
All shipping boxes are reusable. After you remove the contents, replace
the packing materials in the box and store it for future use.

610-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
Installation
Prerequisites
Before you install a module, make the following preparations:
■Verify that the chassis is properly installed in a rack, on a table, or on a
shelf, according to the instructions in either of these guides:
■7-Slot Chassis Quick Installation Guide for the CoreBuilder 9000
Enterprise Switch
■Chassis Quick Installation Guide for the CoreBuilder 9000
Enterprise Switch 8-slot Chassis and 16-slot Chassis.
■Have a flat-blade torque screwdriver available to secure the module to
the chassis after you install it.
■Read the CoreBuilder 9000 Release Notes for the Fast Ethernet and
Gigabit Ethernet Layer 2 Switching Modules for important information
about installing and upgrading modules in an existing chassis or a new
chassis.
CAUTION: All modules in a CoreBuilder 9000 chassis must operate at
compatible software levels. You must verify the software release on all
new and existing modules in your chassis and upgrade as necessary. See
the CoreBuilder 9000 Release Notes for the Fast Ethernet and Gigabit
Ethernet Layer 2 Switching Modules for a module software compatibility
requirements table, mandatory upgrade procedures, and other important
information.
Module Placement
in the Chassis
Note the following chassis slot restrictions and recommendations when
you choose a chassis slot for the 10-port 100BASE-FX Fast Ethernet
Switching Module or the 20-port 10/100BASE-TX Fast Ethernet
Switching Module:
■In the 7-slot chassis:
■Do not install the module in slot 7. This slot is reserved for a
Gigabit Ethernet (GEN) Switch Fabric Module.
■Install the module in slot 1, 2, 3, 4, 5, or 6.
■In the 8-slot chassis:
■Do not install the module in slot 7 or slot 8. These slots are
reserved for GEN Switch Fabric Modules.
■Install the FEN Switching Module in slot 1, 2, 3, 4, 5, or 6.

10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 7
■In the 16-slot chassis:
■Do not install the module in slot 8 or slot 9. These slots are
reserved for GEN Switch Fabric Modules.
■Install the module in slot 1, 2, 3, 4, 5, 6, 7, 10, 11, or 12.
■3Com recommends that you do not install the module in slot 13,
14, 15, or 16 because these slots have only one connection to the
GEN Switch Fabric Module.
■Table 1, Table 2, and Table 3 list the relationship between the
following:
■24-port GEN Switch Fabric Module (SFM) (Model Number 3CB9FG24
or Model Number 3CB9FG24T)
■10-port 100BASE-FX FEN Switching Module
■Switching module slots in the 7-slot chassis, 8-slot chassis, and 16-slot
chassis, respectively
Table 4, Table 5, and Table 6 list the relationship between the following:
■24-port GEN Switch Fabric Module (SFM)
■20-port 10/100BASE-TX FEN Switching Module
■Switching module slots in the 7-slot chassis, 8-slot chassis, and 16-slot
chassis, respectively
Table 7 and Table 8 list the relationship between the following:
■9-port GEN Switch Fabric Module (SFM) (Model Number 3CB9FG9)
■10-port 100BASE-FX FEN Switching Module
■Switching module slots in the 7-slot chassis and 8-slot chassis,
respectively
Table 9 and Table 10 list the relationship between the following:
■9-port GEN Switch Fabric Module (SFM)
■20-port 10/100BASE-TX FEN Switching Module
■Switching module slots in the 7-slot chassis and 8-slot chassis,
respectively
Use the table information to help select a slot for your module, as well as
administer the system after you have completed the installation.

810-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
Ta b l e 1 Mapping the 24-port GEN SFM and the 10-port FEN Switching Module to the 7-slot Chassis
Chassis
Slot
Number
Number of SFM
Backplane Ports
Allocated to Slot
10-port Switching
Module Backplane
Port Numbers
SFM Backplane Port
Numbers Assigned to
Chassis Slot
SFM LED Numbers
Assigned to Backplane
Port Numbers
14; up to 2 can be
accessed by this
module
11
12
1
2
1
2
24; up to 2 can be
accessed by this
module
11
12
5
6
3
4
34; up to 2 can be
accessed by this
module
11
12
9
10
5
6
44; up to 2 can be
accessed by this
module
11
12
13
14
7
8
54; up to 2 can be
accessed by this
module
11
12
17
18
9
10
64; up to 2 can be
accessed by this
module
11
12
21
22
11
12
7Reserved for an SFM Not applicable Not applicable Not applicable

10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 9
Ta b l e 2 Mapping the 24-port GEN SFM and the 10-port FEN Switching Module to the 8-slot Chassis
Chassis
Slot
Number
Number of SFM
Backplane Ports
Allocated to Slot
10-port Switching
Module Backplane
Port Numbers
SFM Backplane Port
Numbers Assigned to
Chassis Slot
SFM LED Numbers
Assigned to Backplane
Port Numbers
14; up to 2 can be
accessed by this
module
11
12
1
2
1
2
24; up to 2 can be
accessed by this
module
11
12
5
6
3
4
34; up to 2 can be
accessed by this
module
11
12
9
10
5
6
44; up to 2 can be
accessed by this
module
11
12
13
14
7
8
54; up to 2 can be
accessed by this
module
11
12
17
18
9
10
64; up to 2 can be
accessed by this
module
11
12
21
22
11
12
7Reserved for an SFM Not applicable Not applicable Not applicable
8Reserved for an SFM Not applicable Not applicable Not applicable

10 10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
Ta b l e 3 Mapping the 24-port GEN SFM and the 10-port FEN Switching Module to the 16-slot Chassis
Chassis
Slot
Number
Number of SFM
Backplane Ports
Allocated to Slot
10-port Switching
Module Backplane
Port Numbers
SFM Backplane Port
Numbers Assigned to
Chassis Slot
SFM LED Numbers
Assigned to Backplane
Port Numbers
1 2 11
12
1
2
1
2
2 2 11
12
3
4
3
4
3 2 11
12
5
6
5
6
4 2 11
12
7
8
7
8
5 2 11
12
9
10
9
10
6 2 11
12
11
12
11
12
7 2 11
12
13
14
13
14
8Reserved for an SFM Not applicable Not applicable Not applicable
9Reserved for an SFM Not applicable Not applicable Not applicable
10 211
12
15
16
15
16
11 211
12
17
18
17
18
12 211
12
19
20
19
20
13 111 21 21
14 111 22 22
15 111 23 23
16 111 24 24

10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 11
Ta b l e 4 Mapping the 24-port GEN SFM and the 20-port FEN Switching Module to the 7-slot Chassis
Chassis
Slot
Number
Number of SFM
Backplane Ports
Allocated to Slot
20-port Switching
Module
Backplane Port
Numbers
SFM Backplane Port
Numbers Assigned to
Chassis Slot
SFM LED Numbers
Assigned to Backplane
Port Numbers
14; up to 2 can be
accessed by this
module
21
22
1
2
1
2
24; up to 2 can be
accessed by this
module
21
22
5
6
3
4
34; up to 2 can be
accessed by this
module
21
22
9
10
5
6
44; up to 2 can be
accessed by this
module
21
22
13
14
7
8
54; up to 2 can be
accessed by this
module
21
22
17
18
9
10
64; up to 2 can be
accessed by this
module
21
22
21
22
11
12
7Reserved for an SFM Not applicable Not applicable Not applicable

12 10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
Ta b l e 5 Mapping the 24-port GEN SFM and the 20-port FEN Switching Module to the 8-slot Chassis
Chassis
Slot
Number
Number of SFM
Backplane Ports
Allocated to Slot
20-port Switching
Module Backplane
Port Numbers
SFM Backplane Port
Numbers Assigned to
Chassis Slot
SFM LED Numbers
Assigned to Backplane
Port Numbers
14; up to 2 can be
accessed by this
module
21
22
1
2
1
2
24; up to 2 can be
accessed by this
module
21
22
5
6
3
4
34; up to 2 can be
accessed by this
module
21
22
9
10
5
6
44; up to 2 can be
accessed by this
module
21
22
13
14
7
8
54; up to 2 can be
accessed by this
module
21
22
17
18
9
10
64; up to 2 can be
accessed by this
module
21
22
21
22
11
12
7Reserved for an SFM Not applicable Not applicable Not applicable
8Reserved for an SFM Not applicable Not applicable Not applicable

10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 13
Ta b l e 6 Mapping the 24-port GEN SFM and the 20-port FEN Switching Module to the 16-slot Chassis
Chassis
Slot
Number
Number of SFM
Backplane Ports
Allocated to Slot
20-port Switching
Module Backplane
Port Numbers
SFM Backplane Port
Numbers Assigned to
Chassis Slot
SFM LED Numbers
Assigned to Backplane
Port Numbers
1 2 21
22
1
2
1
2
2 2 21
22
3
4
3
4
3 2 21
22
5
6
5
6
4 2 21
22
7
8
7
8
5 2 21
22
9
10
9
10
6 2 21
22
11
12
11
12
7 2 21
22
13
14
13
14
8Reserved for an SFM Not applicable Not applicable Not applicable
9Reserved for an SFM Not applicable Not applicable Not applicable
10 221
22
15
16
15
16
11 221
22
17
18
17
18
12 221
22
19
20
19
20
13 121 21 21
14 121 22 22
15 121 23 23
16 121 24 24

14 10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
Ta b l e 7 Mapping the 9-port GEN SFM and the 10-port FEN Switching Module to the 7-slot Chassis
Chassis
Slot
Number
Number of SFM
Backplane Ports
Allocated to Slot
10-port Switching
Module Backplane
Port Numbers
SFM Backplane Port
Numbers Assigned to
Chassis Slot
SFM LED Numbers
Assigned to Backplane
Port Numbers
1 1 11 1 1
2 1 11 2 2
3 1 11 3 3
4 1 11 4 4
5 1 11 5 5
6 1 11 6 6
7Reserved for an SFM Not applicable Not applicable Not applicable
Ta b l e 8 Mapping the 9-port GEN SFM and the 10-port FEN Switching Module to the 8-slot Chassis
Chassis
Slot
Number
Number of SFM
Backplane Ports
Allocated to Slot
10-port Switching
Module Backplane
Port Numbers
SFM Backplane Port
Numbers Assigned to
Chassis Slot
SFM LED Numbers
Assigned to Backplane
Port Numbers
1 1 11 1 1
2 1 11 2 2
3 1 11 3 3
4 1 11 4 4
5 1 11 5 5
6 1 11 6 6
7Reserved for an SFM Not applicable Not applicable Not applicable
8Reserved for an SFM Not applicable Not applicable Not applicable

10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 15
Ta b l e 9 Mapping the 9-port GEN SFM and the 20-port FEN Switching Module to in the 7-slot Chassis
Chassis
Slot
Number
Number of SFM
Backplane Ports
Allocated to Slot
20-port Switching
Module Backplane
Port Numbers
SFM Backplane Port
Numbers Assigned to
Chassis Slot
SFM LED Numbers
Assigned to Backplane
Port Numbers
1 1 21 1 1
2 1 21 2 2
3 1 21 3 3
4 1 21 4 4
5 1 21 5 5
6 1 21 6 6
7Reserved for an SFM Not applicable Not applicable Not applicable
Table 10 Mapping the 9-port GEN SFM and the 20-port FEN Switching Module to the 8-slot Chassis
Chassis
Slot
Number
Number of SFM
Backplane Ports
Allocated to Slot
20-port Switching
Module Backplane
Port Numbers
SFM Backplane Port
Numbers Assigned to
Chassis Slot
SFM LED Numbers
Assigned to Backplane
Port Numbers
1 1 21 1 1
2 1 21 2 2
3 1 21 3 3
4 1 21 4 4
5 1 21 5 5
6 1 21 6 6
7Reserved for an SFM Not applicable Not applicable Not applicable
8Reserved for an SFM Not applicable Not applicable Not applicable

16 10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
Installing the Module To install a FEN Switching Module:
1Before you start the installation process, read and follow the instructions
in “Safety Precautions,” “Handling Precautions,” and “Installation
Prerequisites” earlier in this guide.
2Select a chassis slot for your module, following the restrictions and
recommendations in “Module Placement in the Chassis” earlier in this
guide.
3To expose a slot for the module, remove the blank faceplate.
Save this faceplate in case you need it in the future. Empty slots must be
covered to ensure proper airflow and cooling in the chassis.
3Com recommends that you remove the faceplate only for the slot where
you intend to install an individual module; leave the remaining faceplates
in the chassis.
4Open the module ejector handles.
5Begin to insert the module:
■In the 7-slot chassis, hold the module horizontally with the LEDs to the
left and begin to insert the module using the guides on the left and
the right of the slot. Figure 2 shows the module position in a 7-slot
chassis.
■In the 8-slot chassis and 16-slot chassis, hold the module vertically
with the LEDs at the top and begin to insert the module using the
guides on the top and the bottom of the slot. Figure 3 shows the
module position in a 16-slot chassis. The module position is the same
in an 8-slot chassis.
CAUTION: Do not twist or bend the module when you insert it.
6Slide the module into the chassis by pushing firmly on the two ends of
the front panel near the ejector handles.
WARNING: Hazardous energy exists inside the chassis. Do not place
hands or objects into the chassis or touch any components on an inserted
module.

10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 17
Figure 2 Installing a FEN Switching Module into a 7-Slot Chassis
R
3CB9FG24
PRI
MODSTAT
SEC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
3CB9FG24
PRI
MODSTAT
SEC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
3CB9FG24
PRI
MODSTAT
SEC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
CoreBuilder®9000
9
3CB9LF20R
1
MODSTAT
23456
714
1X
2X
3X
4X
5X
6X
7X
8X
9X
10X
11X
12X
13X
14X
15X
16X
17X
18X
19X
20X
3CB9LF20R
1
MODSTAT
23456
714
1X
2X
3X
4X
5X
6X
7X
8X
9X
10X
11X
12X
13X
14X
15X
16X
17X
18X
19X
20X
Spring-loaded
screws
20-port Fast Ethernet
Switching Module

18 10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
Figure 3 Installing a FEN Switching Module into a 16-Slot Chassis
1 2 3 4 5 6 7 8 12 13 169 10 11 14 15
3CB9FG24
PRI
MODSTAT
SEC
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
3CB9FG24
PRI
MODSTAT
SEC
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
3CB9FG24
PRI
MODSTAT
SEC
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
3CB9FG24
PRI
MODSTAT
SEC
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
3CB9FG24
PRI
MODSTAT
SEC
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
3CB9FG24
PRI
MODSTAT
SEC
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
3CB9LF20R
1
MODSTAT
23456
714
1X
2X
3X
4X
5X
6X
7X
8X
9X
10X
11X
12X
13X
14X
15X
16X
17X
18X
19X
20X
3CB9LF20R
1
MODSTAT
23456
714
1X
2X
3X
4X
5X
6X
7X
8X
9X
10X
11X
12X
13X
14X
15X
16X
17X
18X
19X
20X
R
CoreBuilder®9000
Spring-loaded
screw
20-port
Fast Ethernet
Switching
Module
Spring-loaded
screw

10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 19
7To engage the module with the backplane, use both hands to perform
the following steps:
aPush firmly at the two ends of the front panel near the ejector handles
until you feel the module connectors make firm contact with the
backplane connectors.
bPut your left thumb on the left or top ejector handle and your right
thumb on the right or bottom ejector handle. Simultaneously, push
the ejector handles in towards the front panel until each handle is
parallel with the front panel.
You feel a slight resistance as the connectors fully engage.
CAUTION: If there is too much resistance when you try to close the
ejector handles, the module backplane connector may not be aligned.
Forcing the module into place can damage the module connectors and
backplane connectors. If necessary, remove and reinsert the module,
ensuring that the connectors are properly aligned. Do not tighten the
spring-loaded screws to seat the module.
8To secure the module in the chassis, tighten the spring-loaded screws to a
torque specification of 3 to 5 inch-pounds.
CAUTION: Verify that the module screws are properly aligned with the
threaded holes in the chassis. If the screws are not aligned when you
tighten them, you may strip the threads and make it impossible to secure
the module.
To ensure that you tighten screws to torque specification, use a torque
screwdriver.
WARNING: To ensure adequate cooling airflow and continued product
safety agency compliance, install blank faceplates over all empty slots.
If the chassis is powered on, the module initialization process begins.

20 10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide
Verifying Module
Operation
The 10-port 100BASE-FX FEN Switching Module has 10 Port Status LEDs
and the 20-port 10/100BASE-TX FEN Switching Module has 20 Port
Status LEDs. Each module has one Module Status LED.
Watch the LEDs during the system power-on diagnostics test to verify
proper module operation:
■On the Module Status LED, the normal power-on test sequence is
Green – Yellow – Green – Flashing Green (while running the
diagnostic test) – Green
If the Module Status LED is Yellow after the diagnostics run, the module
has failed.
■The Port Status LEDs are tested during the diagnostic test. The normal
test sequence is Yellow – Green – Off
Table 11 describes LED colors and definitions.
Table 11 Module and Port Status LED Indicators
LED State or Color Definition
Module Status Green Power is on (normal operation).
Flashing Green Diagnostics or software download is in
progress.
Yellow Diagnostic failure.
Off After initial insertion or module reset, the
LED remains unlit for approximately 3
seconds. Otherwise, an unlit LED
indicates that the module is not receiving
power.
Port Status Green Port is enabled and link is up.
Flashing Green Port is receiving or transmitting packets.
Yellow Module or port is malfunctioning.
Off Port is disabled or link is down.