IBM 8265, Руководство по подготовке площадки

Страница: 77 / 164

Chapter 7. Planning for Media Modules
61
Optical Specifications
Frequency
155.52 MHz
Wavelength (
l)
1300 nm
Singlemode: 1261 min / 1360 max
Multimode: 1270 min / 1380 max
Optical Power
Twisted Pair Cabling Information
Table 39 details the accepted UTP, FTP, SFTP, and STP cables for use with the 12
RJ-45 ports.
Table 38. Optical Specifications for 4-port 155Mbps Module Fiber Daughter Cards
Cable Type Maximum
(dBm)
Minimum
(dBm)
Power
Budget
(dBm)
Max Length
Singlemode 9/125 micron
Transmitter Power -8 -15
17.5
20 km
(12.4 miles)
Receiver Sensitivity
1
-8 -32.5
Multimode 50/125 micron
Transmitter Power -14 -22.5
7.5
2 km
(1.24 miles)
Receiver Sensitivity
1
-14 -30
Multimode 62.5/125 micron
Transmitter Power -14 -19
11
2.2 km
(1.36 miles)
Receiver Sensitivity
1
-14 -30
1
The range over which the receiver is guaranteed to provide output data with a
Bit Error Ratio (BER) better than or equal to 2.5 x 10
-10
.
Table 39. Twisted Pair Cabling Information for 12-Port 25Mbps Module
Cable Type Impedance Category Trunk Attenuation
@ 100 MHz Patch Attenuation
@ 100 MHz RFI Class
UTP 100 ohm 5 / Class D 22db Max / 100 m 33 db Max / 100 m A
FTP/SFTP 100 ohm 5 / Class D 22db Max / 100 m 33 db Max / 100 m B
FTP/SFTP 120 ohm 5 / Class D 17db Max / 100 m 25 db Max / 100 mm B
STP 150 ohm IBM Cabling IBM type 1/1A
12.3 db Max / 130 m IBM type 6/6A
18.4 db Max / 130 m/ B