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MW1122 Administrator Manual
E Copyright Nokia Networks Oy
C33902001SE_00
2-10
2.2.5 Dynamic Host Configuration Protocol
MW1122 can act as a Dynamic Host Configuration Protocol (DHCP)
server for the PCs on the end-user home network. In this mode,
MW1122 can assign up to 253+253 consecutive addresses from two
separate address ranges (that is, 253 consecutive addresses per address
range) to the PCs on the home network. Two separate address ranges
are used when LAN and WLAN are operating as separate subnets.
MW1122 can also act as a DHCP relay agent and relay the DHCP
requests to an external DHCP server.
2.2.6 ATM and ADSL
MW1122 supports up to 8 simultaneous VCCs and supports UBR
(Unspecified bit rate) traffic shaping on all VCCs. The maximum
transmit rate on each VCC is the ADSL upstream capacity. If more
than one VCC is transmitting simultaneously, the ADSL upstream
capacity is temporarily shared between these VCCs. When one VCC is
idle, the bandwidth is used by another VCC.
The ADSL transmission is based on the DMT line code. MW1122
provides a DMT line rate up to 8 Mbit/s downstream and up to 800
kbit/s upstream. The DMT transceiver is rate adaptive and capable of
providing faster rates over short distances or slower rates over long
distances. The transceiver adapts itself to the line conditions.
MW1122 supports also ADSL Lite. In the ADSL Lite mode, the
maximum line rates are 1536 kbit/s downstream and 512 kbit/s
upstream.
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.
2.2.7 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