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Nokia M10 User’s Manual
DRAFT
E Copyright Nokia Telecommunications Oy
NTC C33539002SE_A0
2-6
NAPT may restrict the operation of some IP applications. NAPT also
operates as a simple IP firewall because translation is only allowed
when the first packet is transmitted from the LAN because the NAPT
table entry is created on when a packet is sent from the home network
to the Internet. With a pinhole capability the user can add static entries
to the NAPT table allowing the translation always in both directions.
This capability is used to add servers (HTTP, NNTP, and FTP), which
are visible from the public IP network via the VCC, in the LAN subnet
Dynamic Host Configuration
M10 can act as a Dynamic Host Configuration Protocol (DHCP)
server for the PCs in the end-user LAN. In this mode M10 can assign
up to 253 IP addresses to the PCs in the home network.
ATM and ADSL
M10 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 capability. If more
than one VCCs are transmitting simultaneously the ADSL upstream
capability 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. M10 provides
a DMT line rate up to 8 Mbit/s downstream and up to 1 Mbit/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. The
ADSL interface of M10 functions completely automatically and all
configuration related to the ADSL connection is done at the access
multiplexer in the operator’s premises.
The ATM over ADSL transmission is based on ANSI T1.413 Issue 2
recommendation.
Rate adaptation is done in steps of 32 kbit/s. The network operator can
set the data rates as a part of the network management functionality
provided by Nokia Eksos B DSLAM.
Payload encapsulations
Both routed and bridged protocols are encapsulated in the ATM link by
using either RFC 1483 LLC/SNAP encapsulation or VC multiplexing.
M10 also supports PPP over AAL5 encapsulation, in which both
bridged and routed protocols are first encapsulated in PPP (RFC 1661).