Siemens HiPath 3000 Series, Service Documentation

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h3h5_in_the_lan.fm
A31003-H3590-S100-7-7620, 06/2012
HiPath 3000/5000 V9, Service documentation
13-43
Nur für den internen Gebrauch
HiPath 3000/5000 in the LAN Network
HG 1500 Board
13.6.14.1 HG 1500 and Access to the Internet via a Network Provider
13.6.14.2 Internet Access via T-DSL (T-ISDN DSL)
At the end of 1999, Deutsche Telekom AG launched a new product (T-ISDN DSL, also known
as T-DSL) which combines fast Internet access with enhanced T-ISDN telephony features.
(Other providers, for example, in the Netherlands, use DSL with the PPTP protocol).
T-ISDN DSL is first and foremost a normal T-Net or ISDN connection as a multi-device or sys-
tem connection.
Over and above the functions of the normal T-Net or ISDN connection, the T-DSL connection
has a data interface for Internet connections with a speed of 768 Kbps downstream and 128
Kbps upstream. The use of this data interface does not seize any T-Net or ISDN channels.
Function
In contrast to T-ISDN, the NTBA is not connected directly to the main station but rather down-
stream of a splitter (BBAE). This device can be seen as a DSL-speed distributor between the
ISDN connection and data transmission.
The splitter has a TAE jack to which the NTBA is connected. The connection to the HiPath 3000
is set up in the conventional manner.
In addition, the splitter features a connection for the T-DSL modem (NTBBA) which provides
the interface for data transmission at T-DSL speed.
Figure 13-6 Internet Access via a Network Provider
LAN
ISDN network
HG 1500 as router and/or router with NAT
(Network Address Translation) and channel
bundling
Client with Internet browser, e-mail client
0
ABC DEF
MNO GHI
PQRS TUV
↵← →
↑↓
123
456
789
0
ABC DEF
MNO JKL GHI
PQRS TUV WXYZ
UUNET
Internet
HiPath 3300/3350,
HiPath 3500/3550
or HiPath 3800