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Non-ATM Forum Compliant UNI Devices: The ATM Forum has recently defined the wiring of
25.6Mbps twisted-pair cables. Some devices, such as early models of the Turboways 25 ATM adapter,
do not comply with this new specification.
To connect non-ATM Forum compliant devices to the Base Unit, you must use a twisted-pair cable that
connect the pins as listed below:
Table 6. Pin Assignments for Cabling Non-ATM Forum Compliant Devices
Base Unit 25.6Mbps Port
Non-Compliant 25.6Mbps Device
1
RD+
3
TD+
2
RD-
6
TD-
7
TD+
4
RD+
8
TD-
5
RD-
IBM also makes a converter/interposer for such non-ATM Forum compliant devices (P/N 10H3904) which
may be ordered separately.
SSI and NNI Connections: To create SSI or NNI connections via twisted-pair cable, you must use a
twisted-pair cable that connect the pins as listed below:
Table 7. Pin Assignments for Cabling SSI and NNI Connections
Base Unit 25.6Mbps Port
Remote 25.6Mbps Device
1
RD+
7
TD+
2
RD-
8
TD-
7
TD+
1
RD+
8
TD-
2
RD-
IBM makes a cable with this pin arrangement (P/N 51H3971) which may be ordered separately.
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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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