Alloy AS5010-P, User Manual

Page: 176 / 435

AS Series User Manual
175
Doc No.: AS5-0116-01
Fast start repeat count
Rapid startup and Emergency Call Service Location Identification Discovery of endpoints is a critically
important aspect of VoIP systems in general. In addition, it is best to advertise only those pieces of
information which are specifically relevant to particular endpoint types (for example only advertise
the voice network policy to permitted voice-capable devices), both in order to conserve the limited
LLDPU space and to reduce security and system integrity issues that can come with inappropriate
knowledge of the network policy.
With this in mind LLDP-MED defines an LLDP-MED Fast Start interaction between the protocol and
the application layers on top of the protocol, in order to achieve these related properties. Initially, a
Network Connectivity Device will only transmit LLDP TLVs in an LLDPDU. Only after an LLDP-MED
Endpoint Device is detected, will an LLDP-MED capable Network Connectivity Device start to
advertise LLDP-MED TLVs in outgoing LLDPDUs on the associated port. The LLDP-MED application
will temporarily speed up the transmission of the LLDPDU to start within a second, when a new
LLDP-MED neighbor has been detected in order to share LLDP-MED information as fast as possible to
new neighbors.
Because there is a risk of an LLDP frame being lost during transmission between neighbors, it is
recommended to repeat the fast start transmission multiple times to increase the possibility of the
neighbors receiving the LLDP frame. With Fast start repeat count it is possible to specify the number
of times the fast start transmission will be repeated. The recommended value is 4 times,
given that 4 LLDP frames with a 1 second interval will be transmitted, when an LLDP frame with new
information is received.
It should be noted that LLDP-MED and the LLDP-MED Fast Start mechanism is only intended to run
on links between LLDP-MED Network Connectivity Devices and Endpoint Devices, and as such does
not apply to links between LAN infrastructure elements, including Network Connectivity Devices, or
other types of links.
Coordinates Location
Parameter Description
Latitude Latitude SHOULD be normalized to within 0-90 degrees with a maximum of 4
digits.
It is possible to specify the direction to either North of the equator or South of
the equator.
Longitude Longitude SHOULD be normalized to within 0-180 degrees with a maximum of
4 digits.
It is possible to specify the direction to either East of the prime meridian or
West of the prime meridian.