AT&T DS1/DMi/ISDN-PRI manual Equipment Traditional Universal Parameter Module, Isdn-Pri

7-56	ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 2
Fields 1-4		Assigns the circuit pack to an equipment location. Table 7-6, Equipment Parameters
		and Permitted Translation Encodes, depicts the permitted ranges for these encodes.
		TABLE 7-6.Equipment Parameters and Permitted Translation Encodes
			Equipment			Traditional	Universal
			Parameter			Module	Module
			Module	Number		0-30	0-30
			Cabinet	Number		0-7	0
			DS1 Carrier ID			0-3	c-e
			Slot Numbers (Note 1)				1-19 (Note 3)
			ISDN-PRI		Trunks	5 and 18 (Note 2)
			Line+Trunk		Mode	5 and 18 (Note 2)	1-19 (Note 4)
			OPS Line-Only Mode			0,5,13, and 18	1-19 (Note 5)

NOTES:

1.The circuit pack application type (Field 14) will to a large degree determine which slots may be used.

2.When a DS1/MFAT carrier is configured with two DS1s, physical slots 3, 8, 16, and 21 are available for other applications. If only one DS1 is configured, then six additional slots are available for other applications.

3.When the slot is used for ISDN-PRI trunk applications the adjacent right slot must be configured with the TN555 circuit pack, except in nonfacility associated signaling (NFAS) arrangements that have no D-channel on this DS1 link.

4.When used for a mixture of lines and trunks (two slots are required) the adjacent right slot must remain vacant.

5.When used for OPS line applications, there is no requirement to leave a vacant slot to the right. Actually, all 19 slots (1 through 19 consecutively) may be used to provide OPS. However, it is still recommended that the slot to the right remain vacant to accommodate future changes.

Field 6	Used for assigning the framing format. The choices are D4 and ESF (previously
	referred to as F e ).
	The choice of framing format is totally dependent on the equipment connected to
	the interface (such as D4-channel bank, CDM, BCM32000, host computer, and
	other switches). Normally the format is not dependent on facilities used, but there
	could be some older digital radio equipment that only supports D4. The ESF format
	consists of a better framing algorithm and therefore provides more reliable error
	detection than D4. The ESF is the preferred selection for System 75-to-System 75,
	System 75-to-Generic 1 or -Generic 2, System 75-to-System 85, System 85-to-System
	85, System 85-to-Generic 1 or -Generic 2 T1-spans. The D4 format should be
	selected for T1-spans connecting D4-channel banks and CDMs since they do not
	typically support ESF.