User's Guide

8  3 . I n sta lla t ion
© 2 0 0 7 M ose ley, I nc. All Rights Re ser ve d. 6 0 2 - 1 4 8 8 6 - 0 1 , Rev. A
to SDIDU
TM
is t he dist ance and route between t he Event- HD ODU and SDI DU
TM
.
This cable should not exceed 330 feet using Tim es Microwave LMR-200 cable.
Guidelines are provided in Table 3- 1. Exact dist ances should take ODU
requirem ents into account.
Table 3 - 1 . Ma xim um Ca ble Lengt hs
Loss at ( dB/ 1 0 0 m )
Cable Type 1 4 0 M Hz 3 5 0 M Hz
Ma xim um
Le ngt h*
LMR-200 12.6 20.1 100 m
LMR-300 7.6 12.1 165 m
LMR-400 4.9 7.8 256 m
RG- 214 8 13.1 153 m
Belden 7808 8.6 14 143 m
* Does not account for connect or loss.
• Confirm t he Presence of DC Power for the Event - HD Software Defined I DU™.
• Ensure Building Aest het ics: Ensure that t he ODU can be m ounted so that it is
aest hetically pleasing to t he environm ent and t o the propert y owner. Aesthetics
m ust be approved by t he propert y owner and t he net work engineer.
• Take Sit e Photographs
• Sket ch t he Site
3 .6 .3 Cr itica l Syst e m Calculat ions
3 .6 .3 .1 Rece ive d Signa l Le vel ( RSL) and Link Bu dge t
The received signal level ( RSL) can be est imated using the following form ula:
RSL ( dBm ) = P
TX
+ G
TX ANT
– L
Pat h
+ G
RX ANT
Where: P
TX
is t he t ransm itt er output power ( in dBm )
G
TX ANT
is t he gain of the transm it ant enna ( in dB)
G
RX ANT
is t he gain of the receive antenna ( in dB)
L
Pat h
is the Pat h loss, defined by:
L
P
( dB) = 36.6 + 20log
10
( F* D)
Where: F is t he Frequency in MHz, D is t he Dist ance of pat h in m iles
This link budget is very im port ant in det erm ining any potent ial problem s during
installat ion. The expect ed RSL and m easured RSL should be close (+ / - 5 t o 10 dB)