Cable Distance Limitations

The following specifications provide allowable cabling distances for the following devices:

Single-Line Voice Terminals

Multiline Voice Terminals

Data Terminals (RS-232) Connected to Asynchronous Data Units (ADUs).

Single-Line Voice Terminals

SUPPORTING

24-GAUGE WIRE

CIRCUIT

(0.5106 mm)

PACK

 

 

FEET

METERS

 

 

 

 

 

 

 

ZTN78

2,000

610

 

 

 

TN742 *

24,000

7,320

 

 

 

TN742 †

15,000

4,500

 

 

 

*2500-type voice terminals

7101-type voice terminals

IN BUILDING

SINGLE-LINE

VOICE

TERMINAL

EXTENDED STATION

OR

OUT-OF-BUILDING

OR

OFF-PREMISES

SINGLE-LINE

VOICE

TERMINAL

<2000 FEET

> 2000 FEET *

ZTN78

TIP RING LINE

CP

TN742

ANALOG LINE +

CP

*UP TO 24,000 FEET. TIP/RING LOOP RESISTANCE FROM SYSTEM CABINETS (INCLUDING VOICE TERMINAL) MUST NOT EXCEED 1300 OHMS.

+FIVE SINGLE-LINE VOICE TERMINALS

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

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AT&T AT&T manual Cable Distance Limitations, Supporting Gauge Wire Circuit, Pack Feet Meters ZTN78