User's Manual

System operational description
2 November 24, 2004
The allowable temperature range for both operating and storage is
-40°C to +70°C.
The LAUR unit comes with Sercel standard Line, Power and XDEV
connectors. The Type-N, radio connector is waterproof when
connected. Attention should be paid to put the cap in place on the radio
connector whenever the unit is not in use, in order to keep the connector
clean and the unit waterproof.
The LAUR is used in a radio cell, replying to queries from the LRU
present in that cell and using a half-duplex transmission protocol. The
clock in the LAUR is locked on that of the associated LRU, which
continuously transmits a time mark signal (every 50 ms) for that purpose.
Supplied along with each LAUR is an omnidirectional antenna. A mast
extender is also supplied.
Half-duplex
Figure 2
In the transmission protocol, time is shared between transmission of
Master-to-Slave messages and transmission of Slave-to-Master
messages.
Master-to-Slave messages are called Network Control Sequences
(NCS), used for synchronization, zero-time transmission and control.
LRU
LAUR
DTS
NCS
(Master)
(Slave)