Circuit Pack Descriptions
7-10 Issue 8.0 July 2002
Quick Reference Summary 7
Control Functions 7
The SYSCTL circuit pack performs the following control and maintenance
functions:
a. Stores the operating copy of the system executable code and data
b. Performs system-wide maintenance computations and performance
monitoring
c. Automatically resets the system during power up
d. Isolates faults for the LCLAN and OALAN
e. Maintains the real-time clock
f. Performs self audits
g. Controls the circuit pack faceplate FAULT LED on the SYSCTL and the
SYSMEM circuit packs.
Interface Functions 7
The SYSCTL circuit pack provides the following interface functions:
a. Communications between the SYSCTL and SYSMEM circuit packs using
the SYSCTL/SYSMEM interface
b. Communications between the SYSCTL and the LNCTL circuit packs using
the line controller local area network (LCLAN) (FT-2000 OC-48
Add/Drop-Rings Terminals only)
c. Communications between the SYSCTL circuit pack and the OHCTL
(TERM) circuit pack(s) using the overhead access local area network
(OALAN)
d. Communications between the SYSCTL circuit pack and the TOHCTL
circuit pack using the overhead access local area network (OALAN)
e. CIT (DCE) interface for direct local access to the system operating at 1200,
2400, 4800, or 9600 baud
f. CIT (DTE) interface for remote dial-up access to the system operating at
1200, 2400, 4800, or 9600 baud
g. Serial telemetry for advanced provisioning, performance monitoring,
administration, and maintenance activities operating at 2400 baud
(FT-2000 OC-48 Add/Drop-Rings Terminals only.
h. X.25 interface for advanced provisioning, performance monitoring,
administration, and maintenance activities operating at 1200 to 19,200
baud (FT-2000 OC-48 Add/Drop-Rings Terminals only).
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