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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
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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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