User's Manual

MM-015039-001, Rev. H
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4.3.4 Baseband Processor Module (BBP)
The Baseband Processor (BBP) module model EA-555005-001 provides several functions within the
MASTR V P25 Base Station:
 Generates all RX, TX, and Control Processing for one or more RF channels.
 Provides a data interface between the Traffic Controller the TX and RX modules.
 Generates a heartbeat message used to monitor the health of the base station modules.
When a MASTR V Base Station is powered up, the TX, RX, and HPA modules will perform a discovery
period where they await a software request message from the BBP module assigned to manage that slot.
When the message is received, the module will respond with a software response message that prompts
the BBP to send the modules a personality message. The personality message will contain all personality
data (default initialization parameters). The modules respond with an acknowledgement for the
personality message, and then initialize themselves according to the personality data in the personality
message. The BBP module sends the modules a message to go operational. Once operational, the
discovery and initialization phase is complete. The BBP module periodically monitors the modules
through heartbeat messages. The BBP module also performs other vital roles, especially during a P25
Simulcast.
4.3.4.1 Heartbeat Messaging
Heartbeat messaging is used to monitor the condition of the TX, RX, and HPA modules. Once
operational, the BBP module sends out heartbeat messages to each module. When a heartbeat message is
received by a module, the receiving module then sends a heartbeat message back to the BBP module. The
heartbeat monitor task keeps track of the time-stamps of the received heartbeat messages. A fault is
registered if a heartbeat message is not received within a predetermined time-frame. The heartbeat
monitor also keeps track of certain fault conditions.
Table 4-8: BBP Module Connections
LOCATION
CONNECTOR
DESCRIPTION
Rear Panel
SMA
10 MHz Time Base Input
DB-15HD
Simulcast Channel 1
DB-15-HD
Simulcast Channel 2
RJ-45
Ethernet MLAN
95-Pin
Backplane Small Signal Connector (5X19)
3-Pin
Backplane DC Power
Circuit Board (side)
RJ-45
Factory Service Port (Signaling)
4-Pin
Factory Service Port (DC Power)
Front Panel
USB
Field Service Communications Port
Table 4-9: BBP Module – Front Panel Indicators and Controls
INDICATOR/CONTROL
INDICATOR COLOR
DESCRIPTION
Reference LED
The BBP's Reference
LED uses each color
to denote the current
MUX Delay
Controller
BBP Clock
Controller
GPS 10 MHz
Signal
Off
No Power
Red Solid
In Standby
Mode
In Standby
Mode
No Input from
GPS Receiver