Allied Telesis AT-MR840TF - Manual (Page 40)

Technical Specifications
20
Certification
Safety CE Compliant
UL 1950, CSA 22.2 No. 950, TUV EN60950,
EN 60825
Emission EMI/RFI FCC Class A, EN55022 Class A,
Immunity EN50082-1, IEC 801-2 1984 level 2 EFT/Burst
Immunity IEC 801-41 1988 level 2
Connector Pinouts for UTP and Uplink Port
Table 6 shows the pinouts for straight through cable when connecting a hub to
a NIC. Table 7 shows the pinouts for straight through cable when connecting a
hub to a hub (cascading using Port 8). According to the 10Base-T specification,
pins 1 and 2 on the connector are used for transmitting data; pins 3 and 6 are
used for receiving data. The “+” and “-” signs represent the polarity of the two
wires that make up each wire pair.
Table 6: Hub to NIC Pin Assignments
Hub Side
Signal
Name
Pin No.
Signal
Direction
Signal
Name
MDI/MDI-X switch must be
set to MDI-X for UTP
RX+ 1 <----------- TX+
RX- 2 <----------- TX-
TX+ 3 -----------> RX+
TX- 6 -----------> RX-
Table 7: Hub to Hub Pin Assignments
Hub Side
Signal
Name
Pin No.
Signal
Direction
Signal
Name
Hub Side
MDI/MDI-X
switch must be
set to MDI for
fiber
TX+ 1 -----------> RX+ MDI/MDI-X
switch must be
set to MDI-X
TX- 2 -----------> RX-
RX+ 3 <----------- TX+
RX- 6 <----------- TX-
MR840TF_Book Page 20 Tuesday, November 11, 1997 3:46 PM