Figure 13. Straight-Through Utp Cable; Table 50. Pin Assignment For Cabling Port-To-Port Connections; Table 51. Pin Assignment For Non-Atm Forum Compliant Devices - IBM 8265 Site Preparation Manual

80
IBM 8265: Planning and Site Preparation Guide
ATM Device Interconnection
For UNI (User-to-Network Interface) port connections complying with the ATM forum,
a straight-through cable should be used, with the pin assignment shown in Figure 13.
RJ-45
1 2 3 4 5 6 7 8

Figure 13. Straight-Through UTP Cable

For port-to-port connections, the transmit and receive pairs must be crossed (Pin 1 to
Pin 7, and Pin 2 to Pin 8) according to Table 50.

Table 50. Pin Assignment for Cabling Port-to-Port Connections

Pin
1
2
7
8
A cable with this pin assignment is available from IBM, Part Number 51H3971
Early models of ATM adapters do not comply to the ATM Forum. To connect
non-ATM Forum compliant devices to ATM Forum compliant ports, you must use a
twisted pair cable that connects the pins as shown in Table 51.

Table 51. Pin Assignment for Non-ATM Forum Compliant Devices

Pin Compliant Port
1
2
7
8
A cable with this pin assignment is available from IBM, Part Number 10H3904
Important: Be careful of the different pin assignments when interconnecting ATM
forum compliant and non-compliant devices.
Local Port Remote Port
Receive +
Receive -
Transmit +
Transmit -
Non-compliant Port
Receive +
Receive -
Transmit +
Transmit -
RJ-45
1 2 3 4 5 6 7 8
Transmit +
Transmit -
Receive +
Receive -
Transmit +
Transmit -
Receive +
Receive -
Pin
7
8
1
2
Pin
3
6
4
5