Northern UTA220/UTA220k manual Switch Version Default Mode Custom Mode, NI1

ISDN

AT&T switches define Single Term and Multiple Term modes of operation for the TA. AT&T switches support Point-to- Point, Multi-Point services and NI operation depending on the software version loaded in the switch. The switch can also operate in custom mode to support modes other than the default. Table 4-1 shows AT&T switch versions, supported modes, and default modes.

Table 4-1: AT&T Switch Modes

Switch Version	Default Mode	Custom Mode
5E4.2	Point-to-Point	None
5E5	Multi-Point	Point-to-Point
5E6	Multi-Point	Point-to-Point
5E7	Multi-Point	Point-to-Point
5E8	NI1	Point-to-Point
		and Multi-Point
5E9	NI1	Point-to-Point
		and Multi-Point

When you set the TA for Point-To-Point switch operation, it runs in the single term mode and only one TA may be attached. Because only one TA is attached, Service Profile Identifiers (SPIDs) and Directory Numbers (DNs) are not needed to identify the TA. This is called non-initializing mode. This mode functions on a multi-point switch; however, the switch requires the TA to present its DN when it makes calls to distinguish it from other TAs on the line. Thus the DN must be properly configured in the TA in this instance.

Normally on a multi-point line, you configure the TA for multi-point operation. This causes the TA to run in the multi-terminal-initializing mode; SPID numbers are required.

To configure the TA for NI1 operation, select NI1 as the switch type.

Note: If you are using BONDING with the secondary call port, the DN must be entered so that it can be provided to the remote TA.

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