Nokia T66520 - Manual (Page 29)

MW1122 User Manual
E Copyright Nokia Networks Oy C33902002SE_00 28
Application Layer Gateway functionality (ALG). MW1122 has ALG
for the following protocols/applications:
D ICMP
D FTP
D H.323 including NetMeeting
D CUSeeMe
D PPTP
D IRC
D IPSEC ESP tunnel mode and IKE
Note, that most IPSEC implementations will fail when passed through
NAPT. A typical reason is that the identification may fail if the
identification is based on IP address. Also, only tunnel mode without
Authentication Header (AH) works.
4.5 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.
4.6 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.