User's Manual
mBSC DAS System
Installation Manual Issue 3
©2009‐2011,BTIPage11
The Remote Units may consist of combinations of 700MHz, 850MHz, 1900MHz and 2100MHz
frequencies and are available in either a 20 Watt or 40 Watt output configuration. Each RU is designed to
support a Single Frequency Band. For multi-frequency use, the system can be configured as multiple
Master/Slave Remote Units. Each Master Unit can support a maximum of two slave RUs with a maximum
of three RUs supported per fiber connection. The primary transport between the HU and the RU is fiber
optic. The Fiber Optic also provides the RU alarms and configuration communication between the NMS
and the Remote Unit. The downlink and uplink optical signals are duplexed so only one fiber is required.
3.1.1 Host Unit
The Host Unit provides a multiple slot assembly, consisting of 9 slots numbered from left to right: 1
through 9. Slots 7 through 9 are used and specifically keyed for the Remote Control Unit (RCU) and two
redundant Power Supply Units (PSU) only. The Host Unit also houses the Base Station Interface Units
(BIU) and Fiber Interface Units (FIU), Figure 3-2. The BIU comes in Diversity (BIU-D) and Non-Diversity
(BIU-ND) and the FIU comes in Simulcast (FIU-S) and Non-Simulcast (FIU-NS) modules. The HU allows
multiple combinations of BIU and FIU modules with up to 3 band downlink and uplink RF signals per BIU
from the BTS and converts them to analog over RF for fiber transport.
The Host Unit, through interface combinations, provides the following functions:
•
Converts the BTS RF signal to fiber signal.
•
Supplies connectivity between the BTS and the Remote Unit.
•
Manages and monitors the system alarms and configurations.
•
Supports 1 to 3 Sectors system configurations.
•
Supports a single sector with 1:1, 2:1, 3:1 and 4:1 Simulcast configuration.
•
Supplies fiber connectivity to the Remote Unit with in-band message signaling.
Figure 3-2. Host Unit Multiple-Slot Assembly
3.1.2 Network Management System
The Network Management System (NMS), shown in Figure 3-3, is a software-based Network
Management System tool that provides control and monitoring functions for the BTI mBSC DAS system.
NMS is used to provision and configure a new system for operation, set the system operating parameters,
get system alarms and status messages, and update the system firmware.
The Network Management System provides the following functions:
•
Manages SNMP v2 messaging to the Network Operating Center (NOC).
•
Provides a detailed graphic User Interface to manage, monitor and configure multiple DAS
system.
•
Configure multiple DAS systems custom alarms.
•
Provides a firmware update interface.