Nokia T66280, M1122 user manual Dynamic Host Configuration Protocol, ATM and Adsl

M1122 User Manual

4.5Dynamic 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.

4.6ATM 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.

4.7Point-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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