AT&T DS1/DMi/ISDN-PRI manual Procedure 354 Word 3 NPA-NXX Digits Assignment

7-18	ADMINISTRATION OPTIONS AND REQUIREMENTS — SYSTEM 85
Field 7	V4 Only
	This field will accept encodes within the range of 0 through 126. However, all
	point-to-point (nonswitched) links, such as an System 85 R2V4 DMI-MOS link to a
	host computer, must be administered with encode 0. Encodes 1 through 126 are not
	used at this time.
Field 8	V4 Only
	The field will accept encodes ranging from 0 through 255, corresponding to 1-second
	intervals for an elapsed time of up to 4 minutes and 15 seconds. The default value
	for this T203 timer is 30, meaning 30 seconds.
	This timer monitors the facility data link and specifies the maximum time allowed
	without frames being exchanged on a data link layer connection.
Field 9	V4 Only
	The field will accept encodes ranging from 0 through 255, which corresponds to 0.1
	second per increment for a maximum range of up to 25.5 seconds. The default
	value for this T200 timer is 10, meaning 1 second. This timer monitors multiple-
	frame operations on the data link layer.
Field 10	V4 Only
	This field defines a value for the N200 counter. The value determines the maximum
	number of frame retransmissions. The permitted range is from 1 through 10, with 3
	being the default value.
Field 11	V4 Only
	This field defines a value for the K counter. The value determines the maximum
	number of outstanding or unacknowledged information I frames. The range of
	permitted values is from (1 through 10), with 7 being the default value.
	NOTE: Administration values for these procedure 262 timers and counters
	must be coordinated with the other terminating end.

Procedure 354 Word 3: NPA-NXX Digits Assignment

This word and procedure are used to administer the ISDN numbering plan area (NPA). Depending on the switch configuration, there may be more than one ISDN numbering plan. Contents of these fields make up a part of the calling number identification. This is used to transmit information such as the station identification number (SID) and the connected number. The SID is transmitted in the calling number IE, which is a part of the setup message. Figure 7-6,Procedure 354 Word 3: NPA- NXX Assignment (System 85 R2V4), depicts procedure 354, word 3.

NOTE: This word need not be translated unless the application requires that SID or the connected number be transmitted to the network.