Polycom MGC-50/MGC-100 installation manual Net-E1/Net-T1 Isdn Network Interface Module

Chapter 4 - Hardware Description

Net-E1/Net-T1 ISDN Network Interface Module

The Net-E1/Net-T1 ISDN Network Interface module provides the interface between the MGC unit and the ISDN network. It supports up to two PRI connections of the same type (E1, T1). One ISDN Network Interface module in each MGC unit serves as the “master clock,” which synchronizes the system clock to the ISDN network clock. The second module provides a backup clock, which is used if the master clock fails.

Two types of Net-E1/Net-T1 ISDN Network Interface modules are available:

•The NET- T1 Network Interface Module supports channels at data rates of Nx56/64 Kbps to 1536 Kbps. The module provides channel allocation options as described in Table 4-6

•The NET- E1 Network Interface Module supports channels at data rates of Nx56/64 Kbps to 1920 Kbps. The module provides channel allocation options as described in Table 4-7.

Table 4-6: NET-T1 channel allocation

Line type	Channel allocation	Signaling supported
ISDN	23x56/64 Kbps	Variety of North American
	multimedia channels;	signaling protocols
	64 Kbps D-channel	including AT&T, 4ESS,
	signaling	5ESS and Northern
		Telecom DMS-100 and
		DMS-250
Point-to-point leased		Transmission without
		signaling
Table 4-7: NET-E1 channel allocation
Line type	Channel allocation	Signaling supported
ISDN	23x64 Kbps multimedia	Euro-ISDN Standard (ETSI
	channels; 64 Kbps D-	NET 5)
	channel signaling
Point-to-point leased		Transmission without
		signaling

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