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DDR system uses UTP cable(CAT-5,6) as a transmission intermediation which has better transmission characteristic than existing Optic or Coaxial cable.

This system consists of UMH (UTP Expansion Master Hub Unit), which takes the link signal via RF or Digital Optic from a base station., and ERU (Expansion Remoter Unit), that services transmitted digital signal as an analog format. Network can be constructed with EHU (Expansion Intermediate Hub Unit) for extension of coverage.

UMU can have 2 ports of EHU and 8 ports of ERU and EHU can connect with 1 port of EHU and 8 ports of ERU. It is possible to extend the number of ERU up to 72

1) Lower cost than RF or Optic way it can utilize the existing UTP network installed on the building
2) Digital transmission makes no interruption and distortion between signals
3) Easy to move and extend of equipments
4) Useable in combination with telephone and other communication methods
5) ERU consumption power is supplied to UTP cable with digital signal (Max 25Watt)

1) Digital in-building distribution system for CDMA use.
2) Satellite DMB in-building distribution system

Item	Specifications				Remarks
	CDMA		WCDMA
	Forward	Reverse	Forward	Reverse
Operating Frequency	874~894MHz	829~849MHz	2140~2160MHz	1960~1980MHz	WiMAX available
Input Power	-40~-10dBm	-55dBm	-40~-10dBm	-55dBm.
Output Power	+17dBm max.	+5dBm max	+17dBm max.	+5dBm max	Changeable
System Gain	57dB	60dB	57dB	60dB
Gain Control Range	30dB	20dB	30dB	20dB
Operating Temperature	-10 ~ +50C

UMU

EHU

ERU