User's Manual

Designing a Unison Solution PRELIMINARY
8-46 InterReach Unison User Guide and Reference Manual
PN 8700-10
620003-0
The following table lists the typical losses from the configuration shown in Figure 1.
NOTE: Where known losses are less than 1.7 dB (1310 or 1550), the potential reach
will exceed 15 km. For CDMA, care must be taken to ensure that the fiber-induced
latencies do not conflict with the Operator’s PN offset plan.
Description
Downlink
(1310 nm)
Loss
Subtotal
Uplink
(1550 nm)
Loss
Subtotal Source
Optical Power Budget (dB) 7 5.5 LGC Wireless
Inside Plant Cable Loss (dB/km) 0.5 0.5 OCC/
CommScope
Cable Length (km)
a
a. This length will vary for each individual building.
1.2 0.6 1.2 0.6
SMF Jumper Loss (approx. dB/km)
b
b. It is assumed that the SMF jumpers are less than a meter and therefore their loss is negligible.
1.0 0.0 0.5 0.0
SC/APC Insertion Loss (dB): 4 used 0.25 1.0 0.25 1.0 Siecor
Fusion Splice Loss (dB): 6 used 0.05 0.3 0.05 0.3 Alcoa Fujikura
Losses (dB) 1.9 1.9
Available budget for OSP (dB)
(Optical Power Budget – Known Losses) 5.1 3.6
Outside Plant Cable Loss (dB/km) 0.35 0.25 CommScope
Optical Power Budget
– Known Losses
÷ Outside Plant Cable Loss
= Potential Fiber Length (km)
c
c. Actual fiber length may vary due to the quantity and quality of fiber splices in the OSP network.
7
– 5.1
÷ 0.35
14.57
5.5
– 3.6
÷ 0.25
14.40