Optical Systems Design OSD2790SFP User Manual page 161

Application Type
Intended use of the application types:
1. Voice - for use by dedicated IP Telephony handsets and other similar appliances supporting
interactive voice services. These devices are typically deployed on a separate VLAN for ease of
deployment and enhanced security by isolation from data applications.
2. Voice Signalling (conditional) - for use in network topologies that require a different policy for
the voice signalling than for the voice media. This application type should not be advertised if all
the same network policies apply as those advertised in the Voice application policy.
3. Guest Voice - support a separate 'limited feature-set' voice service for guest users and visitors
with their own IP Telephony handsets and other similar appliances supporting interactive voice
services.
4. Guest Voice Signalling (conditional) - for use in network topologies that require a different
policy for the guest voice signalling than for the guest voice media. This application type should
not be advertised if all the same network policies apply as those advertised in the Guest Voice
application policy.
5. Softphone Voice - for use by softphone applications on typical data centric devices, such as
PCs or laptops. This class of endpoints frequently does not support multiple VLANs, if at all, and
are typically configured to use an 'untagged' VLAN or a single 'tagged' data specific VLAN.
When a network policy is defined for use with an 'untagged' VLAN (see Tagged flag below), then
the L2 priority field is ignored and only the DSCP value has relevance.
6. Video Conferencing - for use by dedicated Video Conferencing equipment and other similar
appliances supporting real-time interactive video/audio services.
7. Streaming Video - for use by broadcast or multicast based video content distribution and other
similar applications supporting streaming video services that require specific network policy
treatment. Video applications relying on TCP with buffering would not be an intended use of this
application type.
8. Video Signalling (conditional) - for use in network topologies that require a separate policy for
the video signalling than for the video media. This application type should not be advertised if all
the same network policies apply as those advertised in the Video Conferencing application
policy.
Tag
Tag indicating whether the specified application type is using a 'tagged' or an 'untagged' VLAN.
Untagged indicates that the device is using an untagged frame format and as such does not
include a tag header as defined by IEEE 802.1Q-2003. In this case, both the VLAN ID and the
Layer 2 priority fields are ignored and only the DSCP value has relevance.
Tagged indicates that the device is using the IEEE 802.1Q tagged frame format, and that both the
VLAN ID and the Layer 2 priority values are being used, as well as the DSCP value. The tagged
format includes an additional field, known as the tag header. The tagged frame format also
includes priority tagged frames as defined by IEEE 802.1Q-2003.
VLAN ID
VLAN identifier (VID) for the interface as defined in IEEE 802.1Q-2003.
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OPTICAL SYSTEMS DESIGN
OSD2790SFP OPERATOR MANUAL
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