Net-E1/Net-T1 Isdn Network Interface Module - Polycom DOC2237A Hardware Installation Manual

Chapter 4 - Hardware Description

Net-E1/Net-T1 ISDN Network Interface Module

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