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This soft copy for use by IBM employees only.
B.2.1 Converter Cables
Some early ATM 25-Mbps adapters, such as the IBM TURBOWAYS 25 ATM
adapter (P/N 04H7370), use a pre-standard pin assignment schema based on the
token-ring network cabling standard. To make these adapters compatible with
the Forum-compliant ports of the 8285 switch, it is necessary to use a
token-ring-to-ATM converter cable, available from IBM as P/N 10H3904. The
pinouts for this cable are shown in Table 40.
Table 40. Pin Assignments for Converter Cable (P/N 10H3904)
Signal Port Pin Adapter Pin
RD+ 1 4
RD− 2 5
TD+ 7 3
TD− 8 6
B.2.2 Crossover Cables
The 8285 ports are designed to connect user devices and require a
switch-to-switch crossover cable to connect to other ATM switches, just as a
10Base-T hub does. The pinouts for this cable are shown in Table 41.
Table 41. Pin Assignments for Switch-to-Switch Crossover Cable
Signal Port Pin Adapter Pin
RD+ 1 7
RD− 2 8
TD+ 7 1
TD− 8 2
180 ATM Workgroup Solutions: Implementing the 8285 ATM Switch