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M1122 User Manual
4.5
Dynamic Host Configuration Protocol
M1122 can act as a Dynamic Host Configuration Protocol (DHCP)
server for the PCs on the end-user home network. In this mode, M1122
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 can be
used if more than 253 addresses are required on the local subnet, if two
non-contiguous address ranges are needed or if an additional router
with DHCP relay is used on the local subnet.. M1122 can also act as a
DHCP relay agent and relay the DHCP requests to an external DHCP
server.
4.6
ATM and ADSL
M1122 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. M1122
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. M1122
supports also ADSL Lite. In the ADSL Lite mode, the maximum line
rates are 1536 kbit/s downstream and 512 kbit/s upstream.
M1122 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
M1122 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 M1122. The modem
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