Dell PowerConnect 2808 User's Guide - Page 11

Summary of PowerConnect Models, Features, General Features - serial port

Get Dell PowerConnect 2808 PDF manuals and user guides View all Dell PowerConnect 2808 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 11 highlights

Summary of PowerConnect Models The following table summarizes the PowerConnect models. Table 1-1. PowerConnect Models Model PowerConnect 2808 PowerConnect 2816 PowerConnect 2824 PowerConnect 2848 Copper Ports/ RJ-45 Connectors Optical Ports/ GbE 8 built-in 10/100/1000 Base-T ports none 16 built-in 10/100/1000 Base-T ports none 24 built-in 10/100/1000 Base-T ports 2 SFP (combo) 48 built-in 10/100/1000 Base-T ports 4 SFP (combo) RS232 serial port - Fans baud rate is 9600 bps Internal console port none External console port none External console port 1 External console port 2 Features General Features Management Modes The device supports the following modes: • Managed Mode - Provides switch management through the web interface. • Unmanaged Mode - In this mode, the device operates as a hub with default configuration, and configuration cannot be changed. • Secure Mode - This mode keeps the existing configuration active, but it prevents users from making configuration changes by removing the IP address of the device so that it becomes inaccessible for configuration. For more information about the management modes, see "Management Modes" on page 49. Head of Line Blocking Prevention Head of Line (HOL) blocking results in traffic delays and frame loss caused by traffic competing for the same egress port resources. HOL blocking queues packets, and the packets at the head of the queue are forwarded before packets at the end of the queue. By default, the device is configured so that the HOL blocking prevention mechanism is active at all times, except when QoS (Quality of Service), Flow Control or Back Pressure is active on a port where the HOL blocking prevention mechanism is disabled on the whole system. Back Pressure Support On half-duplex links, the receiving port prevents buffer overflows by occupying the link so that it is unavailable for additional incoming traffic. The user may enable or disable this feature on a per-port basis. The default status on all ports is set to OFF. Dell PowerConnect 28xx Systems User Guide 11

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
Dell PowerConnect 28xx Systems User Guide
11
Summary of PowerConnect Models
The following table summarizes the PowerConnect models.
Features
General Features
Management Modes
The device supports the following modes:
•
Managed Mode
— Provides switch management through the web interface.
•
Unmanaged Mode
— In this mode, the device operates as a hub with default configuration, and
configuration cannot be changed.
•
Secure Mode
— This mode keeps the existing configuration active, but it prevents users from making
configuration changes by removing the IP address of the device so that it becomes inaccessible for
configuration.
For more information about the management modes, see "Management Modes" on page 49.
Head of Line Blocking Prevention
Head of Line (HOL) blocking results in traffic delays and frame loss caused by traffic competing for the
same egress port resources. HOL blocking queues packets, and the packets at the head of the queue are
forwarded before packets at the end of the queue. By default, the device is configured so that the HOL
blocking prevention mechanism is active at all times, except when QoS (Quality of Service), Flow
Control or Back Pressure is active on a port where the HOL blocking prevention mechanism is disabled
on the whole system.
Back Pressure Support
On half-duplex links, the receiving port prevents buffer overflows by occupying the link so that it is
unavailable for additional incoming traffic. The user may enable or disable this feature on a
per-port basis. The default status on all ports is set to
OFF
.
Table 1-1.
PowerConnect Models
Model
Copper Ports/
RJ-45 Connectors
Optical Ports/
GbE
RS232 serial port -
baud rate is 9600 bps
Fans
PowerConnect 2808
8 built-in 10/100/1000 Base-T ports
none
Internal console port
none
PowerConnect 2816
16 built-in 10/100/1000 Base-T ports
none
External console port
none
PowerConnect 2824
24 built-in 10/100/1000 Base-T ports
2 SFP (combo)
External console port
1
PowerConnect 2848
48 built-in 10/100/1000 Base-T ports
4 SFP (combo)
External console port
2