Motorola LM100 Operations Instructions download pdf (Page 36)

GX2-LM1000E* Installation and Operation Manual

Section 4

Operation

This section describes the GX2-LM1000E* embedded section, user selectable operating modes,

network management system, and provides information necessary to properly use the optional

SDU. It also provides information on increasing and decreasing channel loading and, if

necessary, how to download new GX2-LM1000E* firmware.

Embedded Section

The GX2-LM1000E* microprocessor section contains NVM, which stores the operating

firmware, factory-programmed module information, and calibration data.

Additionally, this section contains digital-to-analog (D/A) and analog-to-digital (A/D) converters

that control and monitor module operation. The backplane communication interface is provided

for communication to the GX2-CM100B control module through the GX2-HSG* equipment-shelf

backplane.

Boot Operation

When the GX2-LM1000E* is powered on or reset, the microprocessor boots up and begins

operating. It first performs a cyclic redundancy check (CRC) to verify the integrity of the

firmware. If the CRC indicates error-free firmware, the microprocessor begins operating.

After the boot up completes successfully, the front-panel LED communicates an initialization

sequence: Red, Yellow, Green.

If an error occurs during the boot up, the

STATUS LED illuminates red. An alarm message

indicating that the boot up failed is also sent to the network management system.

If the firmware fails the CRC test, the microprocessor stops operating and the

STATUS LED

blinks red to indicate the boot up failed.

Operating Modes

The following subsections describe the operating modes available and offer suggestions

regarding their application and implementation. The two basic modes are AGC and MGC.

Information on additional settings and functionality is also included. Details on how to select

and implement the operating modes using the SDU are described in a later subsection.

AGC Modes

The following settings (submodes) are available in AGC:

Preset

Preset is a primary mode that establishes the factory default setting and maintains an ideal RF

input level to the laser. The laser RF input level is maintained by (1) sampling the main

RF-path power through an internal RF power meter, (2) comparing it to a factory-calibrated

default AGC power level stored in NVM, and (3) adjusting the RF attenuator until the factory

calibrated default AGC power level is achieved. This process provides the ideal RF input level to

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Motorola LM100 Operations Instructions Page 36