User Manual

ADCP-75-192 • Issue 1 • December 2005 • Section 1: Overview
Page 1-10
 2005, ADC Telecommunications, Inc.
3.6.4 System Interface (STF2)
The System Interface (STF2) module, using four I2C busses, provides the ability to
communicate between the CPU and other modules. The STF2 also communicates with the
GPS modules found both in the Master Hub Reference Module and internal to the RAN STF2.
In the HUB, the STF2 communicates with chassis fans for monitoring purposes.
The four I2C busses are accessible via the CompactPCI backplane or via front panel
connectors.
3.6.5 Sonet Interface (SIF)
The Sonet Interface module provides the fiber interface between the Hub and RAN’s. This
interface includes:
1. Digitized RF Signal information.
2. 10BaseT Ethernet for command and control between Hub and the RAN’s.
3. Measures fiber delay used in Delay Management.
3.6.6 Full Band Hub Down Converter (FBHDC)
The Full Band Hub Down Converter (FBHDC) down converts the forward RF carrier to an
intermediate frequency (IF) that is then digitized by the Forward Simulcast Card (FSC). Each
FBHDC can support up to 15 MHz of contiguous spectrum.
3.6.7 Forward Simulcast Card (FSC)
The FSC converts the IF signals from the FBHDC to Digitized IF (DIF) format. There are
eight (8) separate analog-to-digital conversion circuits on one (1) FSC.
3.6.8 Reverse Simulcast Card (RSC)
The RSC sums the Digital IF (DIF) from up to four (4) RANs into DIF signals that are sent to
the appropriate HUC for up conversion to RF. Single and dual-branch diversity are supported.
3.6.9 Hub Up Converter (HUC)
The HUC accepts two (2) Digital IF (DIF) signals from a SIF or RSC. The two (2) DIF signals
are converted from digital-to-analog and provided as two (2) separate RF signals (primary and
diversity) to the BIM and BTS.
3.6.10 Base Station Interface Module (BIM)
The BIM provides the following BTS interface functions: