Connecting And Synchronizing Radio Base Stations; Connecting Dect Radio Base Stations; Synchronizing Radio Base Stations - Matra Nortel MC 6500 Manual

2.3

CONNECTING AND SYNCHRONIZING RADIO BASE STATIONS

2.3.1

CONNECTING DECT RADIO BASE STATIONS

DECT radio base stations are connected to the PBX using standard S0 interface cards at
144 kb/s and 2-pair cables (S0 point-to-point pinout).
The maximum distance between the radio base station and the card supporting the S0
access is 800 m with a 0.6 mm cable.
The master radio base station must be located as close as possible to the main distribution
frame.
You are strongly recommended to connect the master base station to the first S0
equipment declared as DECT in cell 0. The master radio base station is identified by
RPN: 00. This will facilitate both its identification and wiring verification operations.
Note: In release 11.4 and later, it is not necessary to wire the third pair for the LD4,
EOCU, and LDS cards. Synchronization is achieved by the M-bit of the
S interface.
2.3.2

SYNCHRONIZING RADIO BASE STATIONS

The various base stations within a radio system are synchronized with each other. If
synchronization is faulty or non-existent, the handover function will be impossible.
DECT base stations are piloted by a common clock in order to transmit their radio frames
synchronously.
There are two methods of transmitting this clock signal:
♦
Synchronization by "m bit": a card declared "master" in the system broadcasts the
clock signal to all the slave cards supporting base stations. These cards then
transmit the clock signal to the base stations via the "m bit" of the S frame.
♦
Synchronization by "third pair" or sync pair, where the clock extracted from the
master station is relayed to the other stations by a specific pair linked to the two
pairs carrying the PBX signal to this station.
These two methods apply to all systems in the MC 6500 range with, for each one of them,
distinctive features described in the following chapters. The two types of synchronization
cannot coexist on the same system. The choice of synchronization method is therefore
important and requires in-depth knowledge of the site.
Multi-site MC 6500 systems with several overlapping radio systems are not dealt with in this
document.
LCAH-30521-001-05=01/EN
This confidential document is the property of MATRA NORTEL COMMUNICATIONS and may not be copied or circulated without permission.
Ce document confidentiel est la propriété de MATRA NORTEL COMMUNICATIONSet ne doit pas être reproduit ou communiqué sans autorisation.
PAGE 19/171