Microwave Data Systems EL805, Руководство по установке и эксплуатации

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4 MDS TransNET 900 I&O Guide MDS 05-2708A01, Rev. B
Point-to-Point System
A point-to-point configuration ( Figure 4 ) is a simple arrangement consisting
of just two radios—a master and a remote. This provides a half-duplex
communications link for the transfer of data between two locations.
Invisible place holder
Figure 4. Typical point-to-point link
Adding a Tail-End Link to an Existing Network
A tail-end link can be used to extend the range of a traditional (licensed) MAS
system. This might be required if an outlying site is blocked from the MAS
master station by a natural or man-made obstruction. In this arrangement, an
MDS TransNET 900 radio links the outlying remote site into the rest of a
licensed MAS system by sending data from that site to an associated
MDS TransNET 900 installed at one of the licensed remote sites. (See
Figure 5 ).
As the data from the outlying site is received at the licensed remote site, it is
transferred to the licensed radio (via a local cable connection) and is then
transmitted to the MAS master station in the usual manner. Additional details
for tail-end links are given in Section
4.3 ( Page 17 ).
Invisible place holder
Figure 5. Typical tail-end link arrangement
MDS TransNET
Master MDS TransNET
Remote
Host System
RX
D
TX
D
SY
NC
PW
R
PW
R
SYN
C
TXD
RXD
PWR
SYN
C
TXD
RXD
MDS TransNET
Master
REPEATER STATION
MDS x710B
Series Radio
ENTER
ESCAPE
ACTIVE
ACTIVE
STBY ALARM
RX ALR TX ALR
STBY
ALARM
RX ALR TX ALR
LINE
LINE
PWR
SYN
C
TXD
RXD
Null-Modem Cable
Remote
Radio
Remote
Radio
MDS TransNET
Remote
Master Station
SP
RE
AD
SP
EC
TR
UM
LIN
K
TO
O
UT
LY
ING
SIT
E
OUTLYING
REMOTE SITE
MAS SYSTEM (LICENSED OR UNLICENSED) LICENSE-FREE SPREAD SPECTRUM SYSTEM
RTU
RTU
RTU