3 BTS3012AE Signal Protection SubsystemAbout This Chapter

The BTS3012AE uses the signal lightning-protection subrack to perform the functions of thesignal protection subsystem. These functions include the lightning protection for E1 signals,monitoring signals, signals between combined cabinets and between cabinet groups, and signalsbetween cabinet groups when their distance is 25 meters.

3.1 Components of the BTS3012AE Signal Protection SubsystemThe BTS3012AE uses the signal lightning-protection subrack to perform the functions of thesignal protection subsystem. The signal lightning-protection subrack holds the DMLU, DELU,and DGLU.3.2 Functions of the BTS3012AE Signal Protection SubsystemThe BTS3012AE signal protection subsystem provides lightning protection for E1 signals,monitoring signals, and signals between combined cabinets and between cabinet groups.

BTS3012AEProduct Description(for DCU) 3 BTS3012AE Signal Protection Subsystem

Issue 01 (2007-09-10) Huawei Technologies Proprietary 3-1

3.1 Components of the BTS3012AE Signal ProtectionSubsystem

The BTS3012AE uses the signal lightning-protection subrack to perform the functions of thesignal protection subsystem. The signal lightning-protection subrack holds the DMLU, DELU,and DGLU.

ComponentsFigure 3-1 shows the configurations of boards in the BTS3012AE signal lightning-protectionsubrack.

Figure 3-1 Configurations of the BTS3012AE signal lightning-protection subrackDELU0

DMLU/DGLU

DELU1/DGLU

0 1 2

Table 3-1 lists the relation between the boards and the slot numbers.

Table 3-1 Relationship between the boards and the slot numbers in the signal lightning-protection subrack

Board Slot No.DMLU Slot 1DELU Slots 0 and 2DGLU l The DGLU in the main cabinet group is configured in slot 2

on the DSCB.l The DGLU in the extension cabinet group is configured in

slot 1 of the DSCB.

External CablingFigure 3-2 shows the external cabling of the signal lightning-protection subrack of theBTS3012AE.

3 BTS3012AE Signal Protection SubsystemBTS3012AE

Product Description(for DCU)

3-2 Huawei Technologies Proprietary Issue 01 (2007-09-10)

Figure 3-2 External cabling of the BTS3012AE signal lightning-protection subrack

DELU

DMLU

DGLU

E1 cable

Boolean value output cable

Signal cables between the DSCB

and the DAFU subrack

Signal lightningprotection subrack

DSCB

Far signal cablebetween cabinet groups

Boolean value input cable

Signal cable betweencabinet groups

Monitoring signaltransfer cable between

NPMI and DSCB E1 signal transfer cable

NOTE

The DSCB is the backplane of the signal lightning-protection subrack.

3.2 Functions of the BTS3012AE Signal ProtectionSubsystem

The BTS3012AE signal protection subsystem provides lightning protection for E1 signals,monitoring signals, and signals between combined cabinets and between cabinet groups.The signal protection subsystem performs the following functions:l Protecting E1 signals from lightning strikesl Protecting monitor signals from lightning strikesl Protecting the signals between combined cabinets and between cabinet groups from

lightning strikesl Protecting the eight external Boolean value inputs from lightning strikesl Providing a 2-route 485 serial control bus interface

BTS3012AEProduct Description(for DCU) 3 BTS3012AE Signal Protection Subsystem

Issue 01 (2007-09-10) Huawei Technologies Proprietary 3-3

3 BTS3012AE Signal Protection Subsystem3.1 Components of the BTS3012AE Signal Protection Subsystem3.2 Functions of the BTS3012AE Signal Protection Subsystem