Chapter
3: Web Management
LLDP - LLDP-MED
PoE Switch User Manual | 153
2. Voice Signaling (conditional) - for use in network topologies that require a different policy
for the voice Signaling 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 Signaling (conditional) - for use in network topologies that require a different
policy for the guest voice Signaling 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 Signaling (conditional) - for use in network topologies that require a separate policy
for the video Signaling 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