NDA-24296 CHAPTER 3
Page 445
Revision 1.0
PA-SDTA
SDH/SONET Digit al Trunk

(c) Length of Fiber Optic Cable

The m ax i mum le ngt h of the fiber o p tic cable is approximately 15 kil ometers (9.3 miles). Figure 3-

128 shows the leve l di agram of the fiber optic interface.

Figure 3-128 Level Diagram

Level margin in the case of 15 k ilomete rs (9.3 miles) is as shown in the following table.

Note: Maxi m um cabl e len g th var i es d ep endin g o n t he type of cable and the number of connection points.
Table 3-8 Level Margi n
CONDITION LEVEL MARGIN
Worst case 4.0 dB
Best case 11.0 dB
0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 (km)
0.00
-5.00
-10.00
-15.00
-20.00
-25.00
-30.00
-35.00 Minimum Receiver Sensitivity : -31.00 dBm
Maximum Receiver Sensitivity : -8.00 dBm
: Best Case
: Worst Case
: Maximum Receiver Sensitivity
: Minimum Receiver Sensitivity

Cable Length

1.20 2.40 3.70 4.40 6.20 7.40 8.60 9.90 11.00 12.00 (miles)

Receiver Sensitivity (dBm)