Setup guide

Dedicated Micros ©2007
41
BX2
Transmission Image Buffer
This is a read only setting and shows the buffer size for the network type selected.
Note: If Custom is selected in the Type option, it is possible to congure this setting from 1 to 8.
Ethernet MTU
The Ethernet MTU (Maximum Transmission Unit) is the largest physical packet size, measured in bytes, that a
network can transmit. Any messages larger than the MTU are divided into smaller packets before being sent.
Every network has a different MTU, which is set by the Network Administrator.Ideally, the MTU should be the
same as the smallest MTU of all the networks between your machine and the nal destination. If the MTU gure
is too large they will be broken up (fragmented), which slows down transmission speeds, and in some cases
cause a ‘Connection to Unit Timed Out’ message when using DM Network Viewing Software.
MTU sizes can vary for each connection and it may be necessary to use trial and error to nd the optimal MTU.
Suggested MTU sizes are as follows; Dedicated Micros recommend you obtain this information from your
Internet Service Provider who will provide you with the optimal gure.
Network Connection
PPP (ISDN/PSTN routers)
Ethernet
PPPoE (PPP over Ethernet, ADSL, Cable)
PPPoA (PPP over ATM, ADSL)
VPN
MTU Size
576
1500 (default)
1458
1458
1350
M
ax
i
mum Transm
i
ss
i
on Un
i
t
Warning: Changing the MTU size can have adverse affects on the transmission speed and operation over
the network. Contact your network administrator for advice on MTU sizes for the network.
Ethernet Re-transmit Timeout
The Ethernet Re-transmit timeout is the time the unit will wait to re-send a network packet if an
acknowledgement is not received. When making a connection across a WAN link, this gure should match the
timeout gure for the router. Your Network Administrator can provide this information.
PPP Selection
The unit supports Point to Point Protocol, this menu allows the PPP settings to be congured.
Note: It is necessary to edit the ‘proles.ini’ le for PPP to function. This section will allow basic
conguration of this le. Refer to the Network Guide for more information.
Base PPP IP address
PPP Link 1 IP address
PPP Link 2 IP address
PPP idle line timeout
PPP link down timer
010.001.001.241
010.000.000.001
010.000.000.002
180 Seconds
02 Minutes
Disabled, Enabled
000 - 500 Seconds
00 - 60 Minutes
PPP
S
election