User guide

Chapter 4—Configuring your VOIP
Multi-Tech Systems, Inc. 25
Ethernet/IP
This section covers the Ethernet settings needed for the MultiVOIP unit. In each field, enter the values that fit
the network to which the MultiVOIP will be connected to. For many of the settings, the default values will work
best – try these settings first unless you know you definitely need to change a parameter.
Network parameters
The Ethernet/IP Parameters fields are described in the tables and text passages below. Note that both Diff Serv
parameters (Call Control PHB and VOIP Media PHB) must be set to zero if you enable Packet Prioritization
(802.1p). Nonzero Diff Serv values negate the prioritization scheme.
Field Name
Values
Description
Ethernet Parameters
Packet Prioritization
(802.1p)
Y/N
Select to activate prioritization under 802.1p protocol (described below).
Frame Type
Type II, SNAP
Must be set to match network’s frame type. Default is Type II.
802.1p
A draft standard of the IEEE about data traffic prioritization on Ethernet networks. The 802.1p draft is an
extension of the 802.1D bridging standard. 802.1D determines how prioritization will operate within a
MAC-layer bridge for any kind of media. The 802.1Q draft for virtual local-area-networks (VLANs) addresses
the issue of prioritization for Ethernet networks in particular.
802.1p enacts this Quality-of-Service feature using 3 bits. This 3-bit code allows data switches to reorder
packets based on priority level. The descriptors for the 8 priority levels are given below.