Instruction manual

TECHNICAL SPECIFICATIONS
Cable Distance Limitations
This subsection provides allowable cabling distances for the following devices:
● Single-Line Voice Terminals (Figure 5-1)
● Multiline Voice Terminals (Figure 5-2)
● Data Terminals (RS-232) Connected to Asynchronous Data Units (ADUs)
(Figure 5-3).
Single-Line Voice Terminals
SUPPORTING 24-GAUGE WIRE
CIRCUIT
(0.5106 mm)
PACK
FEET
METERS
ZTN78
2,000
610
TN742 (2500 Series)
17,500 7,320
TN742 (Model 7101A)
15,000 4,500
IN BUILDING
SINGLE-LINE
2000 FEET
ZTN78
VOICE
TIP RING LINE
TERMINAL
CP
EXTENDED STATION
OR
OUT-OF-BUILDING
OR
> 2000 FEET *
TN742
OFF-PREMISES
ANALOG LINE +
SINGLE-LINE
CP
VOICE
TERMINAL
* UP TO 24,000 FEET FOR OUT-OF-BUILDING. TIP/RING
LOOP RESISTANCE FROM SYSTEM CABINETS (INCLUDING
VOICE TERMINAL) MUST NOT EXCEED 1300 OHMS.
+ FIVE SINGLE-LINE VOICE TERMINALS CAN BE BRIDGED
WHEN USING THE TN-742, HOWEVER, ONLY TWO MAY BE
OFF-HOOK AT ONE TIME.
Figure 5-1.
Single-Line Voice Terminal Allowable Cable Distances
5-7