System Manual

ManualsBrandsAlvarion Technologies ManualsElectronicsBroadband Wireless Access System

Table Of Contents

Appendix – Hybrid Digital Modulation Flexible Hop
- General
- Frequencies Selection and Basic Sequence Generation Using the Flexible Hopping Definition Menu

Appendix – Hybrid Digital Modulation

Flexible Hopping Definition for Models with

FCC ID LKT-IF-24-SYNC

General

This addendum applies to BreezeACCESS II models that have been factory

shipped or field upgraded to operate as a hybrid digital transmitter with FCC

ID: LKT-IF-24-SYNC.

The hardware, software features, and menus all remain the same as the FHSS

version of the product, except for the addition of the flexible hopping control

menus as described below.

According to the FCC grant for models operating as HDM, the

transmitted output power of the AU and SU units must be adjusted to

limit the maximum power into the antenna to 19 dBm. Reference the

BreezeACCESS Version 4.3 Revision 3.0 System Manual Book 4:

Operations and Administration (2-44, 2-45) for detail description on

menus and parameter settings.

For IF based units only (AU-BS/AU-NI; SU-A/SU-E) this is done by configuring

the Transmit Power Control parameter to control the gain of the TX power

circuits. Actual parameter setting is based on the IF cable attenuation relative

to the cable length and type used at installation. For non-IF based SU units

(SU-R/SU-I) power control is limited through a Power Level configuration which

is based on High or Low value parameter.

The process of setting the hopping sequence using the Flexible Hopping

Definition mode includes the following steps:

1. Select the frequencies to be used using the Flexible Hopping Definition

2. Define the method of generating the basic hopping sequence based on

the set of selected frequencies, using the Scrambling Definition sub-

menu. The method of generating the basic sequence also defines the

hopping shift mechanism for generating different actual hopping

sequences.

3. Configure the Hopping Shift parameter to define a different hopping

sequence for each AU in order to minimize interference between adjacent

AUs.

Summary of content (7 pages)

PAGE 1
Appendix – Hybrid Digital Modulation Flexible Hopping Definition for Models with FCC ID LKT-IF-24-SYNC General This addendum applies to BreezeACCESS II models that have been factory shipped or field upgraded to operate as a hybrid digital transmitter with FCC ID: LKT-IF-24-SYNC. The hardware, software features, and menus all remain the same as the FHSS version of the product, except for the addition of the flexible hopping control menus as described below.
PAGE 2
The Flexible Hopping Definition menu enables defining the hopping frequencies and the method of scrambling the selected frequencies for generating the basic hopping sequence. It also enables to view the selected hopping frequencies and the current hopping sequence (based on the previous selections made before the last reset). The new selections will come into effect only after the next reset. In cases where all frequencies were deleted the default frequency is 2401 MHz.
PAGE 3
Frequencies Selection and Basic Sequence Generation Using the Flexible Hopping Definition Menu The Flexible Hopping Definition menu includes the following options: Add Frequencies The Add Frequencies option enables defining a new list of sub-bands and/or discrete frequencies. Enter a list of the required sub-bands and/or frequencies, using either sub-bands (f1-f2) or discrete frequencies, e.g. 24022412,2448,2470-2480. Use a comma to separate between entries, do not use spaces.
PAGE 4
Scrambling Definitions The Scrambling Definition menu enables defining the method of organizing the selected frequencies to form the actual hopping sequence to be used. Proper organization of the hopping sequence is essential to guarantee minimal cross interference among several neighboring cells that use the same sequence with different Hopping Shift values. Scrambling Mode Defines the scrambling mode.
PAGE 5
Enhanced Scrambling Automatically generates hopping sequences using an enhanced algorithm. It is recommended that Enhanced Scrambling rather then Standard Scrambling be used. If the Enhanced Scrambling Mode is selected, the Spanning Factor parameter (see below) must be configured in the AU. The Enhanced Mode is not suitable for sequences with 6 or less frequencies. If Enhanced Scrambling is selected with sequences that have 6 or less frequencies, than Standard Scrambling is used by default.
PAGE 6
Manual Sequence Definition Manually defines the hopping sequence, using numbered channel indexes (from 1 to “Number of Hopping Frequencies”). The sequence length must be equal to “Number of Hopping Frequencies” (all the defined frequencies must be used). Erase Manual Sequence Erases the manually defined hopping sequence. Spanning Factor (AU only) Defines the Spanning Factor to be used by the Enhanced Scrambling mechanism.
PAGE 7
Show Flexible Hopping Parameters Displays the following information: An updated list of the defined sub-bands and discrete frequencies to become effective after the next reset. A sub-band is defined by the first and last hopping frequency in a series of consecutive frequencies, with 3MHz separation between frequencies. An updated list of all the hopping frequencies to be used after the next reset. Scrambling Mode Manual Sequence Definition (if applicable) Spanning Factor (if applicable.