Juniper MX10004 - Page 110

Table 38: Esmated Values for Factors Causing Link Loss (Connued)
Link-Loss Factor Esmated Link-Loss Value Sample Link-Loss Calculaon Values
Modal and chromac
dispersion
Mulmode—None, if product
of bandwidth and distance is
less than 500 MHz/km
0 dBm
Single mode—None 0 dBm
Connector 0.5 dBm This example assumes ve connectors. Loss for
ve connectors: 5 (0.5 dBm) = 2.5 dBm.
Splice 0.5 dBm This example assumes two splices. Loss for two
splices: 2 (0.5 dBm) = 1 dBm.
Fiber aenuaon Mulmode—1 dBm/km This example assumes the link is 2-km long. Fiber
aenuaon for 2 km: 2 km (1 dBm/km) = 2 dBm.
Single-mode—0.5 dBm/km This example assumes the link is 2-km long. Fiber
aenuaon for 2 km: 2 km (0.5 dBm/
km) = 1 dBm.
Clock Recovery Module
(CRM)
1 dBm 1 dBm
NOTE: For informaon about the amount of signal loss caused by equipment and other
factors, see your vendor documentaon for that equipment.
2. Calculate the (P
M
) by subtracng (LL) from (P
B
):
P
B
– LL = P
M
13 dBm – 0.5 dBm [HOL] – 5 (0.5 dBm) – 2 (0.5 dBm) – 2 km (1.0 dBm/km) – 1 dB [CRM] = P
M
13 dBm – 0.5 dBm – 2.5 dBm – 1 dBm – 2 dBm – 1 dBm = P
M
P
M
= 6 dBm
100