Table 31: Estimated Values for Factors Causing Link Loss
(Continued)
Link-Loss Factor
Estimated Link-Loss Value
Sample (LL) Calculation Values
Modal and chromatic
dispersion
•
Multimode—None, if product of
bandwidth and distance is less
than 500 MHz/km
•
Single mode—None
•
0 dBm
•
0 dBm
Connector
0.5 dBm
This example assumes 5 connectors.
Loss for 5 connectors:
(5) * (0.5 dBm) = 2.5 dBm
Splice
0.5 dBm
This example assumes 2 splices. Loss
for two splices:
(2) * (0.5 dBm) = 1 dBm
Fiber attenuation
•
Multimode—1 dBm/km
•
Single mode—0.5 dBm/km
This example assumes the link is 2
km long. Fiber attenuation for 2 km:
•
(2 km) * (1.0 dBm/km) = 2 dBm
•
(2 km) * (0.5 dBm/km) = 1 dBm
Clock Recovery Module (CRM)
1 dBm
1 dBm
NOTE: For information about the actual amount of signal loss caused by equipment and other
factors, see your vendor documentation for that equipment.
2. Calculate the (
P
M
) by subtracting (
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
108
Содержание EX4100
Страница 1: ...EX4100 and EX4100 F Switch Hardware Guide Published 2022 11 08 ...
Страница 68: ...Figure 45 Front to Back Airflow Through the EX4100 48P or EX4100 48T Switch Chassis 59 ...
Страница 69: ...Figure 46 Front to Back Airflow Through the EX4100 24MP or EX4100 48MP Switch Chassis 60 ...
Страница 70: ...Figure 47 Front to Back Airflow Through the EX4100 F 24P Switch Chassis 61 ...
Страница 71: ...Figure 48 Front to Back Airflow Through the EX4100 F 24T Switch Chassis 62 ...
Страница 72: ...Figure 49 Front to Back Airflow Through the EX4100 F 48P Switch Chassis 63 ...
Страница 105: ...Figure 62 Clearance Requirements for Airflow and Hardware Maintenance for the EX4100 24MP and EX4100 48MP Switch 96 ...
Страница 106: ...Figure 63 Clearance Requirements for Airflow and Hardware Maintenance for the EX4100 F 24T Switch 97 ...
Страница 107: ...Figure 64 Clearance Requirements for Airflow and Hardware Maintenance for the EX4100 F 24P Switch 98 ...
Страница 108: ...Figure 65 Clearance Requirements for Airflow and Hardware Maintenance for the EX4100 F 48P Switch 99 ...
Страница 209: ...5 CHAPTER Troubleshoot Hardware Troubleshoot the EX4100 and EX4100 F Components 201 ...