IBM SG24-4817-00 manual Converter Cables, Crossover Cables, Signal Port Pin Adapter Pin

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

180ATM Workgroup Solutions: Implementing the 8285 ATM Switch