Manual Part 1

General Description Section 1
Element Management System (EMS) 4.0 User Manual
4
Figure 2 provides a closer look at a working Digivance SDR system. As shown,
the Base Transceiver Station in this system is a BTS application running on the
BTS server. Being software, the BTS application has the advantage that it can be
programmed to process any of a range of Radio Frequency (RF) modulation types.
By comparison, a hardware BTS is restricted to one modulation type.
Figure 2. Closer Look at a Working System
As also shown in Figure 2, the Digivance SDR system involves two ADC cards in
the BTS server: the Host PCIx Card and the Host Network Card. The Host PCIx
Card is the “host unit” referred to on EMS screens. It communicates with the BTS
application over the PCIx bus and, over the fiber interface, with the ADC remote
unit. The Host Network Card is a communication card allowing access to the Host
PCIx Card from the BTS server. The EMS computer plugs into the Host Network
Card DB9 service port. The Host Network Card also provides one input and one
output RJ-45 connector for connecting to other SDR host units in a Control Area
Network (CAN). Up to 24 host units can be networked in this way into one EMS
system. (In an EMS system consisting of a single, collocated host/remote pair, the
Host Network Card can be eliminated by plugging the EMS computer into the
DB9 service port on the remote unit.)
REMOTE
UNIT
BTS SERVER
BSC
NETWORK
HOST
NETWORK
CARD
HOST
PCIx
CARD
PCIx BUS
BASE STATION
APPLICATION
(SDR)
A-bis
INTERFACE
DB-9
UP TO 8
LOGICAL RF
CHANNELS
DIVERSITY
FIBER
(OPTIONAL)
CAN
POWER
EMS
UP TO 24
OTHER HOST
NETWORK
CARDS
19442-A
DIGITALLY
ENCODED
RF SIGNALS
STATUS
ALARMS
USER
REQUESTS
MANAGEMENT
DATA