Cirronet SEM2410 Guide de l'utilisateur télécharger pdf (Page 24)

SEM2410

SEM Operation

Overview

SEM devices are wireless Ethernet modems that perform bridging functions in point-to-point or

point-to-multipoint configurations. SEM products are designed to connect remote network

segments together while keeping the data traffic between the network segments to a minimum.

SEM products use MAC-layer addresses to learn on which network segment a device is located.

A master SEM can connect up to 15 remote slave SEMs. The SEM2410 is a single channel

device with an over-the-air data rate of 460Kbps providing up to 230Kbps full duplex data

throughput. The radio modems in the SEMs are factory configured with optimum settings for

typical point-to-point applications. The radio parameters can be configured to optimize data

throughput, latency and range for whatever the application. In addition, the radios in the SEMs

can be configured to allow multiple SEM networks to be co-located.

Security Modes

The SEM provides several security modes that protect against unauthorized control of the SEM

and unauthorized access to the network to which the SEM is connected.

The first security feature is the need for a password to connect to a SEM remotely through a

telnet session. The password is enabled and cannot be disabled. When a telnet session is initiated,

a password must be entered to gain access to the command line mode of the SEM. The default

password is “Cirronet” (no quotes, case sensitive) but should be changed immediately. When

you change the password, please make note of it and save it in a secure location as there is no

way to recover lost passwords. Another feature is available to limit the ability to initiate telnet

sessions with the SEM. The

access ip add command is used to add specific IP addresses from

which telnet sessions will be allowed. Up to 10 IP addresses can be entered. This featured is

defaulted OFF and is enabled through the

access ip enable command.

The same password required for a telnet session may also be required for a serial connection to

the console port. The default for this feature is Off. It is set using the

access console enable

command. When enabled, the same password used for the telnet session will be required to gain

access to the command line interface of the SEM through the console port.

Similar to the telnet/console password is the FTP password. This password is always required

and cannot be disabled. The default password is “Cirronet” (no quotes, case sensitive) but should

be changed immediately. When you change the password, please make note of it and save it in a

secure location as there is no way to recover lost passwords.

To provide security from unauthorized SEMs gaining access to a SEM network, an access

code/password feature is available. This feature requires slave SEMs to authenticate with the

master before being granted access to the network. This feature is defaulted OFF and is set up

using the

bridge login, bridge access and bridge password commands.

Details of all the security-related commands are found in the Bridge Commands and Security

Commands sections of this manual.

Point-to-Point Mode

In point-to-point operation, one SEM is configured as the Master and the other is configured as a

Slave. While this is necessary for operation, it does not matter which SEM is the master and

which is the slave. The radio in the master operates as the base radio. Configuring the SEM as

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Cirronet SEM2410 Guide de l'utilisateur Page 24

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