Agc; Auto-Setup; Optical Interface Board - Cisco GS7000 Installation And Operation Manual

Theory of Operation

AGC

AGC refers to the automatic tilt and level control of the forward amplifiers. AGC operates on each of the four
forward ports independently by using the output levels (measured by the internal spectrum analyzer) to
continuously adjust the attenuator and equalizers to maintain the desired output level and tilt which are set
using LCS. Thermal compensation is also incorporated in the attenuator and equalizer settings. If input levels
are significantly changed, it takes AGC several minutes to "lock" back in. The attenuator and equalizer settings
are stored in non-volatile memory and restored after a power outage.

Auto-setup

Auto-setup is triggered by LCS and applies only to the forward amplifier. When auto-setup is triggered, the
output level of the input source is measured and the attenuator(s) on the OIB are adjusted to optimize the input
level into the forward amplifier. Auto-setup has to function any time there is a significant change in the input
levels. Note that the attenuator settings are stored in non-volatile memory and restored after a power outage.
Reverse path switching is accomplished automatically by the iNode.

Optical Interface Board

The Optical Interface Board (OIB) provides all interconnections between the modules in the housing lid of
the node. The modules in the housing lid include the power supplies and iRPD. Each module in the lid plugs
directly into the OIB through a connector header, or row of sockets. Software controlled output and input
attenuators are provided on the OIB for iRPD in the housing lid. All RF and power cables running between
the housing lid and base also plug into the OIB.
There is a USB port on the OIB which is used to connect to a smart mobile device. With this USB port the
operator can use the local control software installed on the smart mobile device to configure and monitor the
node. For more information, see
Configuration
The OIB integrates a CPU that is used to control all RF functions on the node.
There are 3 LEDs on the OIB, Heartbeat LED, Communication LED, and Power LED.
Condition
Normal
Power supply
fault
Error #1
Cisco GS7000 Super High Output Intelligent Node Software Installation and
Guide.
Power Heartbeat LED
LED
On Steady blink
Off Off
On Not blink
Cisco GS7000 Super High Output Intelligent Node Installation and Operation Guide
Communication
LED
Steady blink Normal behavior
Off Check power supply and power supply
voltages. Check cabling and that the
appropriate power shunts are installed in the
launch amplifier.
Not blink If Heartbeat LED and Communication LED
blink on power up and then stay off, problem
is with boot. Can be a device failure or
software is not loaded. Try cycling power.
AGC
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