2 BTS3012 Common Subsystem

About This Chapter

The BTS3012 common subsystem performs the following functions: transferring E1 signals,providing clock reference for the BTS, collecting and monitoring environment alarms, andsynchronizing the BTS with the entire network.

2.1 Components of the BTS3012/BTS3012AE Common SubsystemAs the functional body of the BTS3012/BTS3012AE common subsystem, the common subrackconsists of the DTMU, DATU, DCSU, and DCCU.

2.2 Functions of the BTS3012/BTS3012AE Common SubsystemThe BTS3012/BTS3012AE common subsystem manages and controls other subsystems andmodules. It performs the following functions: introducing E1 signals into the BTS, providingclock reference for the BTS, collecting and monitoring the environment alarms, andsynchronizing the BTS with the entire network.

BTS3012Product Description 2 BTS3012 Common Subsystem

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2.1 Components of the BTS3012/BTS3012AE CommonSubsystem

As the functional body of the BTS3012/BTS3012AE common subsystem, the common subrackconsists of the DTMU, DATU, DCSU, and DCCU.

Internal CompositionFigure 2-1 shows the configuration of boards in the BTS3012/BTS3012AE common subrack.

Figure 2-1 Configuration of boards in the BTS3012/BTS3012AE common subrack

DTMU

DTMU

DEMU

DCSU

DCCU

DATU

0 1 2 3 4 5 6 7

Table 2-1 lists the relation between the boards and the slot numbers.

Table 2-1 Relation between the boards and the slot numbers in the common subrack of theBTS3012/BTS3012AE

Board Slot No.

DTMU Slots 0 and 1

DEMU Slots 2, 3, 4, or 7

DATU Slots 2, 3, 4, or 7

DCSU Slot 5

DCCU Slot 6

NOTE

The DTMU is a mandatory board that supports active/standby mode. A maximum of two DTMUs can beconfigured.

The DEMU is not configured in the common subrack of the AC BTS3012AE cabinet.

External CablingFigure 2-2 shows the external cabling of the BTS3012/BTS3012AE common subrack.

2 BTS3012 Common SubsystemBTS3012

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Figure 2-2 External cabling of the BTS3012/BTS3012AE common subrack

DTMU

DCCU

DEMU

DATU

DCSU

Ethernet cables

E1 signal transfer cableFAN subrack

signal transfer cable

Boolean valuesignal transfer cable

RET control signal cable

Signal cable between the DCCU/DCSU and the DSCB（BTS3012AE）

Signal cable between the DCCU/DCSU and the DCTB（BTS3012）Signal cable between the

DCSU and the DTRB

Common subrack

2.2 Functions of the BTS3012/BTS3012AE CommonSubsystem

The BTS3012/BTS3012AE common subsystem manages and controls other subsystems andmodules. It performs the following functions: introducing E1 signals into the BTS, providingclock reference for the BTS, collecting and monitoring the environment alarms, andsynchronizing the BTS with the entire network.

The common subsystem performs the following functions:

l Managing and controlling other subsystems and modules

l Connecting the BTS with the BSC through E1 links: Four routes (default) or eight routes(when specified) of E1 signals are supported.

l Outputting digital alarm signals and extended digital control signals

l Providing and managing clock reference (and hot backup) for the BTS

l Synchronizing the BTS with the entire network, and implementing the BITSsynchronization clock input

l Maintaining and monitoring the BTS equipment

l Guaranteeing the normal operation of the equipment by monitoring and collecting smoke,water, temperature, humidity, infrared, and door alarms

l Reporting alarms associated with the Remote Electrical Tilt (RET) antennas and feedcurrent

BTS3012Product Description 2 BTS3012 Common Subsystem

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