Huawei BM2022, User Manual

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Chapter 6 WiMAX
BM2022 Users Guide
67
Frequency Ranges
The following figure shows the BM2022 searching a range of frequencies to find a connection to a
base station.
Figure 18 Frequency Ranges
In this figure, A is the WiMAX frequency range. WiMAX frequency range refers to the entire range
of frequencies the BM2022 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 BM2022 searching for a connection.
Have the BM2022 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 BM2022 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 BM2022 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 BM2022 currently allows the importation of a PKS#7 file
that contains a single certificate.