Nokia T66520 - Manual (Page 30)

E Copyright Nokia Networks Oy C33902002SE_00 29
MW1122 supports both G.992.1 and G.992.2 ADSL
recommendations defined by ITU-T.
Rate adaptation is done in steps of 32 kbit/s. The ADSL interface of
MW1122 functions completely automatically and all configuration
related to the ADSL connection is done at the access multiplexer in the
operator’s premises. The network operator can set the data rates as a
part of the network management functionality provided by Nokia
DSLAM.
4.7 Point-to-Point Tunneling Protocol (PPTP)
When PPTP local tunneling is used, a local network client initialises a
PPTP-tunneled PPP connection (VPN) to Nokia MW1122. The
modem terminates the tunnel and all data from that terminated local
PPTP tunnel will be forwarded to an assigned ATM VCC by using PPP
over AAL5 encapsulation. Thus, each local PPTP tunnel requires an
equivalent ATM VCC assigned to it restricting the total number of
local PPTP hosts to 8.
Local tunneling is used when there is a need to have one or more
computers connected independently to different networks. For
example, in remote work application, the rest of the family may be
using the common ISP services and one or two family members need to
gain access to their corporate networks. With local tunneling, these
remote workers may be connected to a different network than the rest
of the users.
Local tunneling is activated using the PPTP client running, for
example, in Windows The destination IP address must be MW1122
LAN/WLAN/VBRIDGE IP address depending on the configuration.
PPP packets within PPTP are mapped to the configured VCC.
MW1122 has three different ways to choose the ATM VCC that will be
used for tunneling:
D Automatic, chooses the first free VCC
D Chooses the VCC number using C:number, where number is from
1 to 8. C:number is fed after the MW1122 IP address (see Figure
20).
D Chooses the VCC number using N:name, where name is the
VCCx description. N:name is fed after the MW1122 IP address.