Bedienungsanleitung Gigaset Pro N870E IP PRO (Seite 53 von 142) (Englisch)

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

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

Base stations

•Enhanced packet processing logics (like L3 switching or packet inspection) could have signif-

icant negative impact on the resulting packet delay jitter. If possible, they should be deacti-

vated for N870 IP PRO base stations connected switch ports.

•Significantly increased traffic load on a switch, in the range of the maximum throughput,

could have significant negative impact on the packet delay jitter.

•VLAN based prioritisation of LAN packets could be a fruitful measure to minimize packet

delay and its jitter for N870 IP PRO base stations.

Acceptable Network Jitter for LAN-synchronisation

LAN synchronisation is based on a two layer design:

•Native PTPv2 is used to synchronise a common reference timer along all base stations

involved.

Target quality benchmark to provide sufficient PTP synchronisation along the base stations,

is to have a PTP deviation lower than 500 ns (rms). For this PTP synchronisation a few single

deviations > 500 ns are accepted and might just generate first warnings. If the PTP sync

packet deviation does continuously exceed this limit of 500 ns, the PTP synchronisation is

considered broken and will lead to new start synchronisation procedure.

•Based on the PTP synchronisation LAN master and LAN slave adjust their DECT reference

timer to one common offset to the common PTP reference timer. This common offset will be

permanently monitored by a proprietary communication.

The target quality benchmark for this synchronisation level is to see reference timer devia-

tion by this DECT reference timer sync packets: DECT-LAN-Sync deviation lower than

1000 ns. A good mean value would be 500 ns (rms).

To meet this criteria the switches themselves do not necessarily need to be PTP aware. But the

network should consider the above mentioned guidelines to meet this criteria.

Cluster selective LAN synchronisation

LAN synchronisation consists of two layers:

•Standard PTP which is shared within a multicast IP domain between all DECT managers

•Proprietary DLS (DECT over LAN Sync) which synchronises the clusters isolated within one

DECT manager

Multiple DLS domains are possible per DECT manager as DECT manager clusters. A cluster

forming an isolated PTP domain needs to have one LAN master of its own. Maximum one LAN

master is allowed per cluster.

DLS sync master and slave do care for matching DECT manager and cluster numbers.

Cluster numbers

For LAN synchronisation a cluster needs to be assigned to a PTP domain. This assignment takes

place via the cluster number.

Further information on PTP is available from wiki.gigasetpro.com.

Cluster numbers from 1-c to 7-c (c = common) Build up one common PTP sync domain

Clusters numbers 8-i to 15-i (i = isolated) Build up an isolated PTP sync domain per

each such cluster number

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