Nortel Networks 553-3001-211 manual Elei additional functionality, Cas+, Elei CAS

Page 248 of 894 NT5D33 and NT5D34 Lineside E1 Interface cards

provides alarm notification, E1 link performance reporting, and fault isolation testing. The interface is accessed through connections from the I/O panel to a terminal or modem. Multiple cards (up to 64) can be served through one MMI terminal or modem by linking the LEIs through a daisy chain.

The MMI is an optional feature, since all E1 configuration settings are performed through dip switch settings or preconfigured factory default settings. Available MMI commands, and their functionality, are discussed in-depth in “Man-Machine E1 maintenance interface software” on page 272.

ELEI additional functionality

As mentioned earlier, ELEI cards are enhanced to allow CAS+ compliance, as shown in Figure 40. This enhancement provides several additional benefits for systems with ELEI cards installed.

Note: MDECTS and ELEI (operating in enchanced mode) cannot be configured on the same system.

Figure 40

CAS+ compliance

TDM or IP	Nortel Networks			CAS+
public/private	Meridian 1	ELEI	CAS	compliant
network	or CS 1000S			system

Key Benefits of using CAS+ signaling (ELEI mode) over traditional A/B bit signaling (LEI mode) include:

1Calling Line ID Presentation (CLIP)

When an incoming call over the TDM/IP network or a CS 1000 originated call is directed towards the CAS+ compliant system, Calling Line ID can be provided over the CAS+ interface. This is assuming that the incoming call has the CLID without any presentation restrictions.

553-3001-211 Standard 2.00 September 2004