User's Manual

MA 2000 System Elements
BTS/BDA Side Elements
MA 2000 Installation and Configuration Guide 15
2.1.2 MA Base Unit
The BU (Base Unit) is a wideband device that performs RF to optical (and vice versa) conversion
of the signal on the BTS/BDA side. The BU interfaces to the RIU (or to passive BTS/BDA
interface) and the optic fiber.
Two models of MA BUs are available:
• Four-port unit – supports optic connections to four RUs
• Eight-port unit – supports optic connections to eight RUs
About OPTMs:
Each 4-port unit is referred to as OPTM. An 8-port unit consists of two 4-port modules or two
OPTM, as they are referred to.
NOTE: Each 4-port module is referred to as OPTM and separately managed in the MCT and NMS
management applications.
BU capabilities:
• Supports all services distributed by MobileAccess systems
• Fiber connection to up to 8 RUs
• Setup and monitoring through connection to the host MA 410/430 controller and MCT
software application
• Dry contact alarms
• Front panel indicators providing status on optical link internal circuitry and signal level
MA BU Front Panel
The front panel contains the optical connections and indicators. Each four-port element has a
dedicated set of indicators (PWR, LSR and Link 1 to Link 4 or Link 5 to Link 8).
Figure 2-6. Eight-Port MA BU Front Panel
Figure 2-7. Four-Port BU Front Panel
Four ports and corresponding indicators
Four ports and corresponding indicators