Lucent Technologies 555-661-150 manual Pri

MERLIN LEGEND Communications System Release 6.1	Issue 1
Network Reference 555-661-150	August 1998
1 Introduction
Tandem Trunking and Tandem Switching	Page 1-11

Table 1–1. Tandem PRI Trunks versus Tandem Tie Trunks

Feature	PRI	Tie	Differences
Intersystem calling	✔	✔	PRI provides faster call setup.
For intersystem calls, the caller’s	✔		Calls that cross tandem tie trunks are
extension label and extension number			displayed as outside calls.
can be displayed at recipient’s MLX (and
some DEFINITY) display telephones
across the network.
Manual intersystem transfers across the	✔		When a call is transferred manually
private network return to the originator			across the network on tandem tie
when the intended destination is busy or			facilities, the call does not return in the
has Do Not Disturb on and no call			event that the intended destination is
coverage path available.			busy. The original caller must call back in
			order to speak with someone.
Dial-plan routing of calls on incoming	✔	✔	PRI provides faster call setup.
PSTN PRI trunks across the private
network.
Automatic Number Identification (ANI)	✔		Information is conveyed across the
and Incoming Caller ID (ICLID)			network on tandem PRI trunks, not on tie
			trunks.
Routing of PSTN DID calls across the	✔	✔
network.
128-kbps 2B data video and data	✔		Tie trunks support only 14.4 kbps. T1-
exchange across the network.			emulated tie trunks programmed for data
			can only support up to 112 kbps.
Optimal transmission quality for calls	✔	✔	To ensure adequate transmission quality,
routed across two or more systems in a			no more than two spans of analog
private network.			tandem tie trunks can be provided
			between switches in a series
			configuration (or 3 including transfers
			and coverage). Also, for long loops of
			analog tandem tie trunks between
			switches, you may need to contact the
			PSTN service provider to adjust the
			amplification.
			Transmission quality on PRI and T1
			tandem trunks are the same. Up to eight
			tandem PRI and/or T1 trunks can be
			used in a series configuration providing
			optimal transmission quality. However,
			T1 tandem trunks may cause call setup
			delays.