Nortel Networks DCT1900 manual Radio Exchange Boards, REX-BRD0007 Standalone only

Technical Product Manual - DCT1900

System Description, Radio Exchange Boards

CHAPTER 4

Radio Exchange Boards

4.1General

The RE can contain the following System Board types:

z	Central Processing Unit	(CPU	REX-BRD0004)
		(CPU2	REX-BRD9033 and REX-BRD9034)
z	Speech Processing Unit	(SPU-S	REX-BRD0017)
z	Cell Link Unit	(CLU	REX-BRD0014)
		(CLU-S	REX-BRD0016)
z	Speech Link Unit	(SLU	REX-BRD0015)
z	Digital Trunk Unit	(DTU E1,CCS	REX-BRD0003)
		(DTU E1, CAS	REX-BRD0002)
		(DTU T1, CAS	REX-BRD0021)
		(DTU T1, CCS	REX-BRD0025)
z	Line Termination Unit	(LTU	REX-BRD0007) (Standalone only)
		(LTU2	REXBRD0019A)
z	Digital Line Unit		(DLU REX-BRD0023) (Standalone only)

The RE consists of up to 4 Modular Cabinets. A Modular Cabinet contains, besides the slots for the System Boards, a MCCB and if required, a SDB.

4.2Central Processing Unit - CPU1 (REX-BRD0004 or 2/ROFNB 157 19/2),

CPU2 (REX-BRD9033 or REX-BRD9034)

The Central Processing Unit is responsible for overall control of a DCT1900 system. It contains two standard I/O ports (RS232) and synchronization ports. One CPU board is required per RE.

The CPU/CPU2 performs the following tasks:

zSystem initialization

zCall processing

zIntra system mobility management

zSystem testing and fault recovery

zSystem statistics information

zPWT air interface synchronization

zShort Message Service (SMS) message broadcast

System-DCT1900/R8/mw	4-1
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