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SN-DTA overview
15
SN-DTA User Manual
1 • General information
SN-DTA overview
The SN-DTA ISDN BRI VoIP Terminal Adapter (see
figure 1
) gives demanding ISDN users a quick and easy
way to reap the benefits of state-of-the art Voice-over-IP technology while preserving their investments in
ISDN phones and PBX equipment. Supporting two or four concurrent voice or fax calls over an IP network,
the SN-DTA is a simple and cost-effective way for home and home-office users to connect their ISDN termi-
nals to the cost-saving world of Voice-over-IP.
The SN-DTA provides one to two ISDN S
0
(S/T) Basic Rate Interface (BRI) ports that deliver high-quality
Voice-over-IP (VoIP) to ISDN terminals, connected directly or via a residential S-bus. A 10/100 Base-T Ether-
net port provides connection to either 1) an Internet Telephony Service Provider (ITSP) via a broadband
access router and xDSL or cable modem, or 2) a remote IP-PBX over a corporate-private network.
Figure 1. SN-DTA
The SN-DTA performs the following major functions:
•
Two/four channels of Voice or FAX-over-IP through one/two Euro-ISDN BRI/S
0
port (NT orientation).
•
Provides line power to connected ISDN phone or PBX terminals (TE orientation).
•
Standards-compliant VoIP in accordance with SIP or H.323 protocols.
•
10/100Base-T Ethernet WAN port for connection to a router, xDSL, cable, or wireless modem.
•
Euro-ISDN BRI/S0 port (NTorientation, one to two ports depending on the SN-DTA model type)
•
A fallback cut-through relay between the two ISDN BRI ports electrically connects the NT and TE port in
case of power failure and enables life-line calls to the public ISDN network (PSTN-supplied ISDN line
must be used).
(SN-DTA/2BIS2V/EUI only)
•
High Precision Clock—Delivers DECT PBX interoperability with reliable fax performance.
(SN-DTA/HP
versions only)