IBM SG24-4817-00 - Manual (Page 112)

This soft copy for use by IBM employees only.
token-ring and Ethernet, the pinouts are different and incompatible, as shown
in Table 39 on page 179.
• Fiber Ports
−
Physical Interface:
100 Mbps ports: SC or MIC
155 Mbps ports: SC
−
Cabling Supported:
- Multimode Fiber I/O Cards
100 Mbps/155 Mbps ports:
• 50/125
µ
m (micron) multimode fiber
• 62.5/125
µ
m
- Single Mode Fiber I/O Cards
155Mbps ports:
• Light Source: LASER at 1300+/-20nm
• 9(
±
1)/125
µ
m (micron) single mode fiber
It is not necessary for a single type of fiber to be used from one end of a
connection to another. However, doing so will provide you with longer
distances between devices and may simplify troubleshooting and cable
management issues as well. Should you choose to use different
types/diameters of fiber, use the tables in the appendices of
IBM 8285
Nways ATM Workgroup Switch: Installation and User
′
s Guide, SA33-0381
to determine if the optical budget for each port is adequate.
• E3 COAXIAL BNC Ports:
−
Cable type: RG59
−
Impedance: 75 Ohms
−
Attenuation: 25dB MAX per 100m
−
Maximum distance: 100m
• D3 COAXIAL BNC Ports:
−
Cable type: RG59
−
Impedance: 75 Ohms
−
Attenuation: 25dB MAX per 100m
−
Maximum distance:
68m by default
135m using an option setting (see IBM 8260/8285 ATM WAN Module
Installation and User ′ s Guide, SA33-0396 at DS3 parameter ″
Line
Buildout
″).
96
ATM Workgroup Solutions: Implementing the 8285 ATM Switch