B&K 2250 Light Bedienungsanleitung PDF herunterladen (Seite 75)

CHAPTER 8

Advanced Use of Your Analyzer – Tips and Tricks

Compact Flash Modems

The following modem has been tested:

• Compact GPRS from Pretec (www.pretec.com)

Compact flash modems can be inserted directly in the compact flash socket of the analyzer.

8.2.3 DynDNS

If the analyzer is connected to:

• The Internet through a GPRS/EDGE/HSPA modem, or

• A local network with access to the Internet through a DSL modem/router

And you want to connect to the instrument from a place outside the local network, then you

need to know:

• Global IP address of the instrument or

• The global IP address of the DSL modem/router (and ensure that correct port forwarding

in has been set the router – see details in the on-line help for BZ-5503)

In some cases the global IP address is static and will never change, so you connect to the

instrument using BZ-5503 or an Internet browser by using this IP address.

Normally when you browse to addresses using an Internet Browser you do not use the IP

address itself, but a hostname for it (e.g. you would use the hostname www.google.com instead

of ‘74.125.77.99’). This requires a DNS (Domain Name System) provider, which is a kind of

Internet phone book that translates hostnames to IP addresses for you.

However, for a GPRS/EDGE/HSPA or even a DSL router then often the global IP address is

renewed at each new connection or at certain time-intervals (e.g., every two weeks). In this

case you will have to change the IP address in BZ-5503 or the Internet Browser accordingly. To

avoid this, a service like DDNS (Dynamic Domain Name System) can be used.

DDNS is a network service that provides the capability for a modem/router/computer system to

notify a domain name system provider to change, in real time (ad-hoc), the active DNS

configuration of its configured hostnames and IP addresses. This will ensure that the hostname

you use will always be updated to reflect the correct IP-address.

The analyzer supports DDNS provided by the world-wide DDNS service provider

‘DynDNS.com’.

The analyzer can then be configured to notify DynDNS.com each time the global IP address is

set or changed. When BZ-5503 or an Internet Browser connects to the analyzer it then uses a

hostname defined by DynDNS.com. From DynDNS.com it then gets the updated IP address.

You need to make an account at DynDNS.com, specifying a user name and a password for the

account and a hostname (e.g., 'MyBK2250.dyndns.org') identifying the analyzer.

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B&K 2250 Light Bedienungsanleitung Seite 75