AT&T DS1/DMi/ISDN-PRI manual Location, Line

	ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1			7-117
Location	A display-only field specifying the carrier and slot of the DS1 Interface.
Name	The name as assigned on the network diagram.
Line	Refers to the distance between the switch and		the network channel-terminating
Compensation	equipment (NCTE), CDM, CEM, DSX-1 cross-connect, T1 office repeater,			or
	other equipment. The compensation setting is for the total distance between the
	switch and the endpoint. Table 7-13, Line Compensation Values, summarizes
	compensation.
	TABLE 7-13.Line Compensation Values
		Compensation Value	Distance (Feet)
		1	000 to 133
		2	133 to 266
		3	266 to 399
		4	399 to 533
		5	533 to 655

NOTE: Compensation values assume 22-gauge ABAM or 24-gauge PDS cables. Two colocated switches can be up to 1310 feet apart with compensation on both systems set to the maximum values. If 26-gauge PDS cables are used, distances are reduced as shown in table 3-1,System 85 Traditional Module Equalizer Settings (Metallic Cable).

The T1 office repeaters or T1 line repeaters can be used when the on-premises distance limitation is exceeded. A T1 office repeater is required at each end of the connection to provide an interconnection range of up to 3000 feet. Each repeater only provides regeneration for the receive direction. The T1 line repeaters can be used to accommodate distances up to 6000 feet between switches. The T1 line repeaters can be used in tandem to accommodate greater distances.

Zero Code Specifies the line coding format (ZCS or B8ZS) that will be used to forcibly ensure

Suppression that the data meets T1-carrier ones-density requirements. The choice of data rates, communications protocol, and facility requirements discussed under System 85 procedure 260, field 9, also apply here.

Framing The choices are D4 or ESF (previously referred to as Fe). The network diagram

Modeshould show the choice for the particular DS1/T1-span. The other end and all intermediate equipment should be optioned accordingly.