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UTP/FTP/STP Cabling Information
Table 3 details the accepted UTP/FTP/STP cables for the 25.6Mbps ATM ports.
Table 3. UTP/FTP/STP Cabling Details
Cable Type
Impedance
Category
Trunk
Attenuation
@ 100 MHz
Patch
Attenuation
@ 100 MHz
RFI
Class
UTP-5
100 ohm
5 / Class D
22db MAX / 100m
33db MAX / 100m
A
FTP/SFTP
100 ohm
5 / Class D
22db MAX / 100m
33db MAX / 100m
B
FTP/SFTP
120 ohm
5 / Class D
17db MAX / 100m
25db MAX / 100m
B
STP
150 ohm
IBM type 1/1A
12.3db MAX / 100m
IBM type 6/6A
18.4db MAX / 100m
B
Legend:
UTP-5
Unshielded Twisted Pair (Category 5)
FTP
Foiled Twisted Pair
SFTP
Screened and Foiled Twisted Pair
STP
Shielded Twisted Pair
TRUNK Rigid cable
PATCH Flexible cable
For more information, refer to the
IBM 8250/8260/8285: Planning and Site Preparation Guide,
GA33-0285.
Cabling Distances
Table 4 lists the maximum cabling distances for devices attached to the 25.6Mbps ATM ports.
Table 4. ATM Device Cabling Distances
Cable Type
Maximum Allowable Distance (m)
UTP Category 3
100 (330 ft)
UTP Category 4
150 (495 ft)
UTP Category 5
160 (528 ft)
STP
300 (990 ft)
Note: The minimum UTP cable quality must meet EIA/TIA-568 specification for Category 3 or equivalent UTP wiring.
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IBM 8285 Nways ATM Workgroup Switch:
Installation and User’s Guide
Summary of Contents for 8285 Nways
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