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DS2 Setup Guide

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DS2
Note: If Custom is selected in the Type option, it is possible to congure this setting between
000000 Kbits/s and 100000 Kbits/s.
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 to 1, 2 or 3.
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 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.