Chapter 5. Planning for Twisted Pair Cable Connections
51
ATM 1.5 and 2Mbps
This section details the supported cables and maximum allowable distances for
attaching 1.5Mbps and 2Mbps ATM devices. These devices follow the cabling rules
established in EIA/TIA-568
Commercial Building Telecommunications Cabling
Standard
and ISO/IEC DIS 11801, for horizontal cabling Class D.
ATM 25Mbps
This section details the supported cables and allowable distances for attaching
25Mbps ATM devices to the 8260 or 8285. These devices follow the cabling rules
established in EIA/TIA-568
Commercial Building Telecommunications Cabling
Standard
and ISO/IEC DIS 11801.
Using Building Cabling
Building cabling extends from the office wall outlet to the wiring closet patch panel.
The 8260 and 8285 support devices attached to RJ-45 jacks through the building by
means of 100-ohm unshielded twisted pair (UTP) or foiled twisted pair (FTP) Category
3, 4, or 5, or 120-ohm UTP or FTP Category 4 or 5 cabling, including patch and
equipment cabling. Termination hardware should always match the category of cable
that is terminated on it.
IBM Cabling System 150-ohm, shielded twisted pair (STP) cables (type 1, 1A, 9, and
9A) may also be used.
The distances in Table 33 apply to 25Mbps ATM cables supported for use with 8285s.
Although cables between the 8260/8285 and 25Mbps ATM adapters can be longer
than 90 m (295 ft), note that standards support a maximum of 90 m (295 ft). If you
install cables longer than 90 m, their reuse may be limited as technologies change.
Table 32. Maximum Link Distance over ATM (155Mbps)
Cable Type
Maximum Allowable Distance
100 ohm STP
30 m (100 ft)
120 ohm STP
122 m (400 ft)
Table 33. Maximum Link Distance over ATM (25Mbps)
Cable Type
Maximum Allowable Distance
100 ohm UTP Category 3
100 m (328 ft)
100 ohm UTP Category 4
148 m (486 ft)
100 ohm UTP Category 5
160 m (525 ft)
120 ohm FTP Category 4
162 m (532 ft)
120 ohm FTP Category 5
212 m (696 ft)
150 ohm STP Type 1
255 m (837 ft)
150 ohm STP Type 9
170 m (558 ft)
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