Nortel Networks DCT1900 manual Base Station Cable Delay Measurement

Technical Product Manual - DCT1900

Installation Instructions, Base Station – KRC 101 1371

The cable set, NTM/TSRNB 101 29, that connects the CLU/SLU to the MDF brings out the three pairs mentioned above: SC0, SC1, and EPP. Refer to Fig. 21-3, 66 Block Diagram in Chapter 21 for the pin out of the 66 Block where this cable terminates.

A minimum of -21V DC is required at the Base Station for it to operate. When a Base Station is located too far away from the Radio Exchange to be powered by the Radio Exchange, then power can be provided by a local -48V power supply or an AC to 48V DC adaptor. The power supply or adapter should be placed in the last Intermediate Distribution Frame before the Base Station. Hook the output of the power supply/adapter to the EPP wires going to the Base Station; DO NOT connect the EPP wires at the Radio Exchange. Only the two data pairs should go from the Radio Exchange to the Base Station in this situation. The EPP wires are picked up in the last Intermediate Distribution Frame where the Base Station’s power source is located.

16.3Base Station Cable Delay Measurement

The cable delay in each of the cable pairs going to every Base Station must be measured in order to program the Base Station delays into the system at initialization time. This is necessary in order to synchronize all Base Stations in the system.

Base Station cable delay may be measured by two methods, ADM or measurement with a TDR (Time Domain Reflectometer).

ADM, or Automatic cable Delay Measurement, is a feature where the CPU automatically measures the delay in the cable hooked up to a Base Station. Beginning with the hardware and software releases listed below, the DCT1900 system can automatically determine the correct Base Station cable delay. This means that it is no longer mandatory to have a TDR (Time Domain Reflectometer) on each and every job site to measure the cable delays.

Item	Hardware PN	Rev	Firmware/Software	Application	Firmware PN	Rev
CPU1	REX-BRD0004	R1A	DCT1900 Firmware	Mobility	RYS 105 447	R2A
			DCT1900 Firmware	Standalone	RYS 105 657	R2A
CPU2	REX-BRD9033	R1A	DCT1900 Firmware	Standalone
CPU2	REX-BRD9034	R1A	DCT1900 Firmware	Mobility
SLU	REX-BRD0015	R3B	CLU-S Board Controller	MOB & SA	RYSNB 101 19	R2A
CLU-S	REX-BRD0016	R3A	CLU-S Board Controller	MOB & SA	RYSNB 101 19	R2A
CSM	NTM 201 2087	R2B	Unlicensed	Standalone	LZY 213 1031	R2B
CSM	NTM 201 1813	R2B	Unlicensed	Mobility	LZY 213 903	R2A
CSMW	REX-MCT9023	R3C	UTAM	MOB & SA
CSMW	REX-MCT9022	R3C	International	MOB & SA

Table 16-2 Minimum Release Requirements to Support ADM

Note:

ADM will not be supported if the system is not comprized of the listed minimum release levels. The Automatic delay measurement does not work with the CLU boards (REX-BRD0014 or ROFNB 157 11 or ROFNB 157 11/2)

16-4	Install-DCT1900/R8/mw
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