Circuit Pack Descriptions
Issue 8.0 July 2002
7-17
LNCTL (LAA28) Circuit Pack Description 7
Purpose of Circuit 7
The Line Controller (LNCTL) circuit pack is the middle level of the three-level
control hierarchy for the FT-2000 OC-48 Lightwave System. It performs real-time
intensive line functions, primarily protection switching, and line specific
computations. The LNCTL circuit pack is not required for the FT-2000 OC-48
Repeater Bay.
The LAA28 LNCTL (4 MEG) circuit pack is required for bidirectional ring
applications and is compatible with Release 1.1.1-TRM or later software.
Faceplate LED 7
The LNCTL circuit pack has a red FAULT LED on its faceplate (Figure 7-5). The
red FAULT LED is lighted during a reset condition, when a circuit pack failure is
detected, or when the circuit pack loses power. If the circuit pack loses power, a
separate path is provided for power from the System Controller (SYSCTL) circuit
pack to light the FAULT LED on the LNCTL circuit pack.
The sanity check circuitry detects hardware and software faults. When a fault
occurs, the microprocessor is reset and the FAULT LED on the circuit pack
faceplate is lighted.
Figure 7-5. LNCTL (LAA28) Circuit Pack
LNCTL
LAA28
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FAULT
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