Aastra DECT 142 (OMM SIP) Manuel d'utilisateur télécharger pdf (Page 15)

Installation, Administration and Maintenance

Aastra Telecom Page: 15 (47)

An IP DECT installation is more reliable if a RFP can receive the signal from

more than only one RFP, because the other signals are also used for

synchronization.

R 111 R 110 R 109 R 108

R 106

R 101 R 102 R 103 R 104 R 105

R 107

Unreliable Installation

R 111 R 110 R 109 R 108

R 106

R 101 R 102 R 103 R 104 R 105

R 107

Reliable Installation

Don‘t

The sync-over-air solution is very reliable, because all existing redundant

paths are used for synchronization. Thus, hardware tolerances have only

very little influence. No RFP has a key position.

Only unfavourable setups without redundant synchronization paths can

cause problems.

Sometimes RFPs do not need to be synchronized, e.g. if they are in different

buildings. These RFPs can be put into different clusters. RFPs in different

clusters will not be synchronized with each other. Different clusters start up at

the same time independently.

2.6 RFP channel capacity

The RFP has 12 available air time slots:

• 8 slots can have associated DSP resources for media streams.

• The remaining 4 slots are used for e.g. control signalling between RFPs

and PPs, and hand-in purposes.

If all 8 media stream channels are used the RFP announces a “busy bit”. In

that case the PPs determine whether another RFP has an appropriate signal

strength. If so, the PP will handover to that RFP. Once the handover has

been completed, the RFP will then lower its “busy bit”.

Whenever the busy state is announced a log entry is made to the system

logs. If the announcement of busy raises in a specific area, a further RFP

should be installed to double the number of media streams available for calls.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 46 47

Pas de commentaire

Aastra DECT 142 (OMM SIP) Manuel d'utilisateur Page 15