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MultiVOIP User Guide Technical Configuration
6
7
The Ethernet/IP Parameters fields are described in the tables and text
passages below. Note that both DiffServ parameters (Call Control PHB
and VoIP Media PHB) must be set to zero if you enable Packet
Prioritization (802.1p). Nonzero DiffServ values negate the
prioritization scheme.
Ethernet/IP Parameter Definitions (cont’d)
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.
802.1p PRIORITY LEVELS
LOWEST PRIORITY
1 – Background: Bulk transfers and other
activities permitted on the network,
but should not affect the use of
network by other users and
applications.
2 –
Spare: An unused (spare) value of the
user priority.
0 –
Best Effort (default): Normal priority for
ordinary LAN traffic.
3 –
Excellent Effort: The best effort type of
service that an information services
organization would deliver to its most
important customers.