AT&T System 85 manual 344

2500 MMGL and 2500 YMGL Telephones

Distance Limitations

The maximum allowable distances of a 2500 telephone from the DEFINITY G1, G2, G3, System 75, or System 85 cabinet are shown in the table below.

		NOMINAL MAXIMUM RANGE
SYSTEM	PORT BOARD		IN FEET (METERS)
		24 AWG		26 AWG
SYSTEM 85	SN229	3,500	(1,067)	3,500	(1,067)
	SN228B	15,000	(4,572)	9,000	(2,743)
DEFINITY G2	SN229	3,500	(1,067)	3,500	(1,067)
	SN228B	15,000	(4,572)	9,000	(2,743)
	TN742	20,000	(6,100)	13,000	(3,962)
	TN746	3,100 (945)		2,000 (610)
	TN746B	3,100 (945)		2,000 (610)
DEFINITY G1 & G3	TN742	20,000	(6,100)	13,000	(3,962)
SYSTEM 75	TN769	20,000	(6,100)	13,000	(3,962)
	TN746	3,100 (945)		2,000 (610)

Power Requirements

Both 2500 telephones are powered by the tip and ring leads. These telephones do not require any external power supply.

Switch Administration

Both 2500 telephones must be administered in the following ways:

If the 2500 MMGL or 2500 YMGL telephone is connected to a System 75 or DEFINITY G1 or G3, it must be administered as a 2500 analog telephone.

If either of the 2500 telephones is connected to a System 85 or DEFINITY G2, it can be administered as an analog line.

Power Failure Operation

Both 2500 telephones can be used as an emergency station during power failure transfer condi- tions.

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