3com 3C17300 Owner's Manual Page 23
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Placing Units On Top of Each Other 23
Placing Units On
Top of Each Other
If the Switch units are free-standing, up to eight units can be placed one
on top of the other. If you are mixing a variety of SuperStack
®
3 Switch
and Hub units, the smaller units must be positioned at the top.
If you are placing Switch units one on top of the other, you must use the
self-adhesive rubber pads supplied. Apply the pads to the underside of
each Switch, sticking one in the marked area at each corner. Place the
Switch units on top of each other, ensuring that the pads of the upper
unit line up with the recesses of the lower unit.
Stacking Units Up to four Switch 4200 Series units can be stacked together and then
treated as a single manageable unit with one IP address. Any
combination of Switch 4200 Series units is allowed in a single stack. The
units are connected together via the 10/100/1000BASE-T ports on the
front of the unit as shown in Figure 6
. Starting from the base of the stack,
the port marked with ‘up’ is connected to the port marked with ‘down’
on the unit above. Cable lengths of between 14 cm (5.5 in) and
100 m (328 ft) can be used for stacking.
Figure 6 Stacking example
The unit LEDs will display the unit number in the stack, from 1 at the
bottom to 4 at the top.
3Com recommends that when you add a new unit to a stack, you should
first initialize it to factory default settings
Stack renumbering occurs when another Switch 4200 Series unit is added
to the bottom of an established stack except when the stack is already 4
units high. In this instance the ‘down’ port on the bottom unit of the
existing stack will be disabled and its LED will flash green. You will then
not be able to use that port again until the link is lost on that port.
Power/
Self Test
Alert
21
91022
11
23 12 24
8
20
1
13
197
18
6
17
5
16
4
153
14
2
26 / Down
25 / Up
1
2
3
4
Unit
Power/
Self Test
Alert
21
91022
11
23 12 24
8
20
1
13
197
18
6
17
5
16
4
153
14
2
26 / Down
25 / Up
1
2
3
4
Unit
3C17304 Superstack 3 Switch 4228G
Power/
Self Test
Alert
21
91022
11
23 12 24
8
20
1
13
197
18
6
17
5
16
4
153
14
2
26 / Down
25 / Up
1
2
3
4
Unit
3C17302 Superstack 3 Switch4250T
8
32
1
25
31
7
30
6295
28
427
3
26
2
49
50
16
40
9
33
39
15
38
14
37
13361235
11
34
10
24
48
17
41
47
23462245
21
44
20
43
19
42
18
Up
Down
Alert
Power/
Self Test
Unit
1
2
3
4
27
28
27
28
27
28
27
28
3C17304 Superstack 3 Switch 4228G
3C17300 Superstack 3 Switch 4226T
DUA1730-0AAA02.book Page 23 Thursday, January 23, 2003 12:28 PM
- SuperStack 1
- Switch 4200 Series 1
- Getting Started Guide 1
- 3Com Corporation 2
- 5400 Bayfront Plaza 2
- Santa Clara, California 2
- 95052-8145 2
- CONTENTS 3
- 3 SETTING UP FOR MANAGEMENT 4
- 4 PROBLEM SOLVING 4
- A SAFETY INFORMATION 5
- B PIN-OUTS 5
- C TECHNICAL SPECIFICATIONS 5
- D TECHNICAL SUPPORT 5
- REGULATORY NOTICES 6
- ABOUT THIS GUIDE 7
- Table 1 Notice Icons 8
- Table 2 Text Conventions 8
- Related 9
- Product 10
- Registration 10
- Documentation 10
- Comments 10
- INTRODUCING THE 11
- SUPERSTACK 3 SWITCH 4200 11
- About the Switch 12
- 4200 Series 12
- — Front View 13
- Table 4 LED behavior 15
- — Rear View Detail 17
- Table 5 Default Settings 18
- INSTALLING THE SWITCH 19
- Choosing a Suitable 20
- Rack-mounting 21 21
- Placing Units On 23
- Top of Each Other 23
- The Power-up 24
- Sequence 24
- The Power-up Sequence 25 25
- Color State 25
- GBIC Operation 27 27
- ■ Fiber SC connector 28
- GBIC Ports 29
- Transceiver 29
- SETTING UP FOR MANAGEMENT 31
- Setting Up 32
- Overview 32
- Setting Up Overview 33 33
- Manually 35
- Configuring IP 35
- Information 35
- ■ IP address — 169.254.100.99 36
- ■ Subnet mask — 255.255.0.0 36
- ■ A suitable cable: 39
- ■ 19,200 baud 40
- ■ 8 data bits 40
- ■ no parity 40
- ■ 1 stop bit 40
- ■ no hardware flow control 40
- Viewing 42
- Automatically 42
- Configured IP 42
- Methods of 45
- Managing a Switch 45
- Command Line 47
- Interface 47
- Management 47
- ✓ ✓ ✓ ✓ ✓ ✓ 48
- ✕ ✓ ✓ ✓ ✓ ✕ 48
- ✓ ✓ ✓ ✓ ✓ ✕ 48
- Setting Up SNMP 49
- Default Users and 50
- Passwords 50
- Switch CD-ROM 51
- PROBLEM SOLVING 53
- Solving Problems 54
- Indicated by LEDs 54
- Solving Hardware 55
- Problems 55
- Solving 55
- Communication 55
- Solving Stack 56
- Formation 56
- Solving Software 57
- Upgrade Problems 57
- 58 CHAPTER 4: PROBLEM SOLVING 58
- SAFETY INFORMATION 59
- Important Safety Information 60
- PPENDIX A: SAFETY INFORMATION 62
- PIN-OUTS 67
- RJ-45 Pin 68
- Assignments 68
- 1000BASE-T RJ-45 69
- Pin Assignments 69
- Table 13 Pin assignments 70
- TECHNICAL SPECIFICATIONS 71
- Switch 4250T 73
- (3C17302) 73
- Switch 4228G 74
- (3C17304) 74
- TECHNICAL SUPPORT 75
- Network Supplier 76
- Support from Your 76
- ■ Diagnostic error messages 77
- Asia, Pacific Rim 78
- Returning Products 79
- PPENDIX D: TECHNICAL SUPPORT 80
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