AT&T DS1/DMi/ISDN-PRI manual Off-Premises Cabling, Maximum FT or Less, Maximum DSX-1 DS1

DS1 TRANSMISSION AND CABLING 3-5

DS1
	655 FT	655 FT
	MAXIMUM	MAXIMUM
DSX-1 PHANTOM POINT

DS1

A. DIRECT DISTANCE OF 1310 FT OR LESS

DS1

DSX-1

NCTE

OFFICE

REPEATER

NCTE

OFFICE

REPEATER

DSX-1

DS1

655FT

MAXIMUM

3000 FT OR LESS

655 FT

MAXIMUM

DSX-1

DS1

655FT

MAXIMUM

B. DISTANCE OF 1311 FT TO 4310 FT

NCTE T1 LINE

REPEATER

3000 FT OR LESS

6000 FT OR LESS

	DSX-1
DS1		NCTE	T1 LINE
			REPEATER
655 FT
			3000 FT OR LESS

MAXIMUM

C. DISTANCE OF 4311 OR MORE

Figure 3-1.On-Premises Metallic-Cable Configurations

Off-Premises Cabling

When DS1s reside in different locations, they are typically connected via a transmission facility (such as a metallic cable configuration) that is leased from the local exchange company (LEC). This facility usually consists of a line and T1 repeater combination. The customer premises equipment interfaces to a DS1 network facility (T1 line) via NCTEs.