User Manual

ADCP-75-192 • Issue D • October 2005 • Section 2: Description
Page 2-7
 2005, ADC Telecommunications, Inc.
2.2 STF2
The System Interface (STF2) module is installed into the Digital Chassis and provides the
ability to communicate between the CPU and other modules (e.g., HDC, FSC, and HUC),
using four I2C busses. The STF also communicates with the GPS module found in the Master
Hub Reference Module.
STF modules are specified according to the number of qualifying communications devices
being utilized. This module differs from the RAN STF2 in that it does not contain the GPS
circuitry included in the RAN STF2.
The front panel controls for the System Interface are:
• RST – Reset switch, recessed button. This button halts operation of the operating
system. A power on reset is required to restart.
The front panel indicators for the System Interface are:
• Status LED 1/2 – Yellow LED. Reserved for future use. Both LED’s will be lighted
when the CPU is not installed or has malfunctioned
• GPS LED – Green LED indicating 1PPS signal is available. Led toggles once per
second (RAN only)
• FLT LED – Red LED lighted when module has failed or upon startup until the
module has been initialized
• PWR LED – Green LED lighted when module has power
• I2C Comm LED – On each I2C RJ-45 connector. Green LED lighted when I2C
message sent
• I2C Error LED – On each I2C RJ-45 connector. Red LED when no response on
interface
• HS LED – Hot Swap LED, turns blue when board can be hot swap extracted (not used
in CXD)
The STF2 has jumpers JP-7 and JP-8. JP-7 is jumpered when using CPU Part Number
1001491G002. JP-8 is jumpered when using CPU Part Number 1001310G002