Circuit Pack Descriptions
Issue 8.0 July 2002
7-9
Serial User Interfaces. 7The SYSCTL circuit pack provides the following serial user
interfaces:
CIT (DCE) interface: The CIT (DCE) interface is configured as data circuit
equipment (DCE) for direct craft interface terminal (CIT) access. In
releases prior to Release 5, the CIT (DCE) interface allows direct access to
a PC running FT-2000 CIT-PC software only. In Release 5 and later
releases, the CIT (DCE) interface may also be provisioned to allow direct
access to a PC running the CPro-2000 software or an ASCII-based
terminal. The CIT (DCE) interface supports data rates up to 9600 baud.
■ CIT (DTE) interface: The CIT (DTE) interface is configured as data
terminating equipment (DTE) to allow a permanent connection to a
modem. In releases prior to Release 5, the CIT (DTE) interface allows
dial-up access to a PC running FT-2000 CIT-PC software only. In Releases
5 and later releases, the CIT (DTE) interface may also be provisioned to
allow direct access to a PC running the CPro-2000 software or an
ASCII-based terminal. The CIT (DTE) interface supports data rates up to
9600 baud.
■ Serial telemetry interface: The serial telemetry interface supports
telemetry byte-oriented serial (TBOS) protocol. The serial telemetry
interface is used to transfer alarm, status, and control and
performance-monitoring information to and from a remote maintenance
system using a 2400-baud EIA-422 port (FT-2000 OC-48 Add/Drop-Rings
Terminals only).
■ X.25 interface: The X.25 interface supports X.25 protocol and the
transaction language 1 (TL1) message language. The X.25 interface is
used to report alarm and status conditions and performance-monitoring
data to Telcordia’s Network Monitoring and Analysis (NMA
*
) system. The
physical connection is an EIA-232-D port that operates at data rates from
1200 to 19,200 bps (FT-2000 OC-48 Add/Drop-Rings Terminals only).
For more information about these interfaces, refer to Volume I, Section 6,
“Operations Interfaces.”
Power Circuitry 7
The SYSCTL circuit pack receives two sources of −48 volts that are diode OR'd,
fused, and filtered. A modular DC-to-DC power converter produces +5 volts and
−5 volts used on the circuit pack. The power converter also provides a +5 volt
source for the FAULT LED on any circuit pack that has a power failure.
The SYSCTL circuit pack monitors the two −48 volt sources to the circuit pack. If
the SYSCTL circuit pack detects a failure of the onboard fuse or power converter,
the red FAULT LED will light. If the fuse or power converter fails, the SYSMEM
circuit pack provides +5 volts to light the FAULT LED on the SYSCTL circuit pack.
* NMA is a trademark of Telcordia Technologies, Inc.
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