Power Failure Operation - AT&T Callmaster Series Reference Manual

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.
SYSTEM
SYSTEM 85
DEFINITY G2
DEFINITY G1 & G3
SYSTEM 75
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.
3-344
NOMINAL MAXIMUM RANGE
PORT BOARD
24 AWG
SN229 3,500 (1,067)
SN228B 15,000 (4,572)
SN229 3,500 (1,067)
SN228B 15,000 (4,572)
TN742 20,000 (6,100)
TN746 3,100 (945)
TN746B 3,100 (945)
TN742 20,000 (6,100)
TN769 20,000 (6,100)
TN746 3,100 (945)
IN FEET (METERS)
26 AWG
3,500 (1,067)
9,000 (2,743)
3,500 (1,067)
9,000 (2,743)
13,000 (3,962)
2,000 (610)
2,000 (610)
13,000 (3,962)
13,000 (3,962)
2,000 (610)