User's Manual Part 1

Chapter 6 WiMAX
BM2022w User’s Guide
71
Frequency Ranges
The following figure shows the BM2022w searching a range of frequencies to find a connection to a
base station.
Figure 26 Frequency Ranges
In this figure, A is the WiMAX frequency range. “WiMAX frequency range” refers to the entire range
of frequencies the BM2022w 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 BM2022w searching for a connection.
Have the BM2022w 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 BM2022w 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 BM2022w to generate certification requests that contain
identifying information and public keys and then send the certification requests to a certification
authority.
Certificate File Formats
The certification authority certificate that you want to import has to be in one of these file formats:
• Binary X.509: This is an ITU-T recommendation that defines the formats for X.509 certificates.
• PEM (Base-64) encoded X.509: This Privacy Enhanced Mail format uses lowercase letters,
uppercase letters and numerals to convert a binary X.509 certificate into a printable form.
• Binary PKCS#7: This is a standard that defines the general syntax for data (including digital
signatures) that may be encrypted. The BM2022w currently allows the importation of a PKS#7
file that contains a single certificate.