Bedienungsanleitung Gigaset Pro N870E IP PRO (Seite 52 von 142) (Englisch)

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Template Module, Version 2.1, 11.08.2020 / Template Basiseinstellungen: Version 3.1 - 07.07.2020

Base stations

Gigaset N870 IP PRO / Admin IE-UK-International en / A31008-XXXXX-XXXX-X-XX / settings_basestations.fm / 8/10/21

Requirements for LAN synchronisation

•Minimum number of switch hops between master and all slave base stations.

•For internally and uplink switching use Enterprise class switches >= 1Gbit/s.

•VLAN based QoS could be fruitful to minimise packet delay and its jitter. Switch port based

VLAN can isolate base stations from other devices' traffic.

•DSCP (Differentiated Services Codepoint) based QoS could be even more efficient.

Settings for DSCP tagging:

•Synchronisation via LAN makes intensive use of IP multicasts which have to be supported by

the switches.

Multicast destination address and ports:

Cascaded switches might need uplink switching of these multicast packets to allow inter-

switch LAN synchronisation. Otherwise you need isolated LAN-sync clusters, inter-cluster-

synchronized via DECT.

•IGMP snooping is supported and shall be supported by the switch, to configure and mini-

mise multicast distribution only to the LAN synchronising base stations.

Packet delay jitter

Minimum packet delay jitter between LAN master and LAN slaves is crucial for successful

synchronisation over LAN.

•LAN master role should be assigned to that switch port, that offers the lowest packet jitter to

all LAN-Slaves.

•If there are several suitable devices, the LAN master role should be assigned to a device that

has little traffic.

This is preferably a base station with low VoIP traffic. If in doubt, you can even deactivate

DECT at the base station and operate the base station only as LAN master. As a rule, however,

this is not necessary.

Devices that include the DECT manager (and the integrator) in addition to the base station

are not recommended as LAN masters due to the variety of tasks and traffic to be served. This

applies to devices with medium capacity if DECT is deactivated for the base station. The

performance advantage thus gained is easily consumed by the DECT manager and inte-

grator functions.

As multiple LAN traffic parameters could have an impact on packet delay and its jitter, specific

switches and maximum number of switch hops are required, to guarantee sufficient maximum

packet delay jitter.

Consider the following:

•The less switch hops, the lower the transmission delay and its jitter will be.

•The higher the bandwidth or quality of used switches is regarding packet delay and its jitter,

the lower the packet delay and the lower the packet delay jitter will be.

Sync via LAN: PTPv2, DLS (proprietary): DSCP=CS7=56

RTP: DSCP=EF=46

SIP: DSCP=AF41=34

PTPv2: 224.0.1.129 UDP via ports 319/320

Proprietary DLS protocol: 239.0.0.37 UDP via ports 21045/21046

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