ZyXEL Communications MAX218M2W, User Manual

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Chapter 6 WiMAX
MAX208M2W Series User’s Guide
69
Frequency Ranges
The following figure shows the MAX208M2W Series searching a range of
frequencies to find a connection to a base station.
Figure 22 Frequency Ranges
In this figure, A is the WiMAX frequency range. “WiMAX frequency range” refers to
the entire range of frequencies the MAX208M2W Series is capable of using to
transmit and receive (see the Product Specifications appendix for details).
In the figure, B shows the operator frequency range. This is the range of
frequencies within the WiMAX frequency range supported by your operator
(service provider).
The operator range is subdivided into bandwidth steps. In the figure, each C is a
bandwidth step.
The arrow D shows the MAX208M2W Series searching for a connection.
Have the MAX208M2W Series search only certain frequencies by configuring the
downlink frequencies. Your operator can give you information on the supported
frequencies.
The downlink frequencies are points of the frequency range your MAX208M2W
Series searches for an available connection. Use the Site Survey screen to set
these bands. You can set the downlink frequencies anywhere within the WiMAX
frequency range. In this example, the downlink frequencies have been set to
search all of the operator range for a connection.
Certification Authority
A Certification Authority (CA) issues certificates and guarantees the identity of
each certificate owner. There are commercial certification authorities like
CyberTrust or VeriSign and government certification authorities. You can use the
MAX208M2W Series to generate certification requests that contain identifying
information and public keys and then send the certification requests to a
certification authority.