LG Electronics LKA-200 Electrical Characteristics Transmission Characteristics, Tolr Rolr Solr

Issue 1 Jan 2006 LKA-200

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6.0ELECTRICAL CHARACTERISTICS

6.1TRANSMISSION CHARACTERISTICS

6.1.1 Loudness Rating

Transmit, receive and sidetone objective loudness ratings shall be determined in accordance with the requirements of TBR21 standard. Data measure in term of separate numerical ratings for transmit (TOLR), receive (ROLR), and sidetone (SOLR) for each of the following line conditions.

TBR 21

Items		TOLR		ROLR		SOLR
		Lower	Upper	Lower	Upper	Lower	Upper
2800	Ω	7	- 1	- 4	- 12	5	-
1000	Ω	7	- 1	- 4	- 12	10	-
500	Ω	10	- 1	- 1	- 12	7	-

6.1.2 Telephone noise

Required result: Less than - 60 dB for all conditions.

6.1.3 Receiver noise

Required result: Less than - 85 dB for all conditions.

6.2 NETWORKING SIGNAL CHARACTERISTICS 6.2.1 DTMF Level

DTMF Level generated for each of the two fundamental frequencies under 900 ohm termination at loop current of 20 mA.

Required results:
High-frequency component	:	-6.5 ~ -10.5 dBm.
Low-frequency component :		-8.5 ~ -12.5 dBm.

6.2.2 DTMF Difference (Twist)

The different DTMF level between low frequency component and the high frequency component. Required result: 2 + 1dBm.

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