Sun Enterprise 220R Server Service Manual

Appendix A Connector Signal Descriptions

This appendix describes the Sun Enterprise 220R system main logic board connector signals and pin assignments accessible from the back panel.

Topics covered in this appendix include:

A.1 Reference for the Keyboard/Mouse Connector

A.1.1 Keyboard/Mouse Connector Diagram

The keyboard/mouse connector (J2701) is a DIN-8 type connector located on the main logic board back panel.

A.1.2 Keyboard/Mouse Connector Signals

Pin	Signal Name	Signal Description
1	Gnd	Ground
2	Gnd	Ground
3	+5 VDC	+5 VDC
4	Mse-rxd	Mouse receive data
5	Kbd-txd	Keyboard out
6	Kbd-rxd	Keyboard in
7	Kbd-pwk	Keyboard power on
8	+5 VDC	+5 VDC

A.2 Reference for the Serial Port A and B Connectors

The serial port A and B connectors (J2902 and J2903, respectively) are DB-25 type connectors located on the main logic board back panel. Both serial ports conform to RS-423/RS-232 specifications.

A.2.1 Serial Port A and B Connector Diagram

A.2.2 Serial Port Signals

Pin	Mnemonic	Signal Name	Description
1		Not Connected	None.
2	TXD	Transmit Data	Used by the data terminal equipment (DTE) to transmit data to the data circuit equipment (DCE). Except when control data is being sent, RTS, CTS, and DCD must be ON for this line to be active.
3	RXD	Recive Data	Used by the DCE in response to received data from the DTE.
4	RTS	Ready to Send	Used by the DTE to condition the DCE for data transmission. The transition to ON directs the DCE to go into transmit mode. The transition to OFF directs the DCE to complete the transmission.
5	CTS	Clear to send	Used by the DCE to indicate if it is ready to receive data from the DTE. When CTS, DSR, RTS and DTR are ON, the DCE is ready to transmit data received from the DTE across the communications channel. When only CTS is ON, the DCE is ready to accept dialing or control signals only. When CTS is OFF, the DTE should not transfer data across TXD.
6	DSR	Data Set Ready	Used by the DCE to indicate if it is ready to operate. When DSR is ON, the DCE is connected to the line and ready to exchange further control signals to start data transfer.
7	Gnd	Signal Ground
8	DCD	Data Carrier Detect	Used by the DCE to indicate it is receiving a suitable signal from the communications channel.
9		Not connected	None.
10		Not connected	None.
11		Not connected	None.
12		Not connected	None.
13		Not connected	None.
14		Not connected	None.
15	TRXC	Transmit Clock	Used by the DCE to provide timing information to the DTE. The DTE provides data on TXD in which the transition of the bit corresponds to the rising edge of the clock.
16		Not Connected	None.
17	RTXC	Receive Clock	Used by the DCE to provide timing information to the DTE. The falling edge of the clock corresponds to the center of the data bit received on RXD.
18		Not connected	None.
19		Not connected	None.
20	DTR	Data Terminal Ready	Used to control switching of the DCE to the communication channel.
21		Not connected	None.
22		Not connected	None.
23		Not connected	None
24	TXC	Terminal Clock	Generated by the DTE to provide timing information to the DCE. Used only in synchronous mode and only when the driver requests a locally generated clock. Otherwise, TXC echoes the modem-generated clock. The falling edge of the clock corresponds to the center of the data bit transmitted on TXD.
25		Not connected	None.

A.3 Reference for the Twisted-Pair Ethernet (TPE) Connector

The twisted pair Ethernet (TPE) connector is a RJ-45 type connector located on the main logic board back panel.

Connect only TPE cables into the TPE connector.

A.3.1 TPE Connector Diagram

A.3.2 TPE Connector Signals

Pin Number	Signal Name	Description
1	tpe0	Transmit data +
2	tpe1	Transmit data -
3	tpe2	Receive data +
4	Common mode termination	Termination
5	Common mode termination	Termination
6	tpe3	Receive data -
7	Common mode termination	Termination
8	Common mode termination	Termination

A.4 Reference for the UltraSCSI Connector

The Ultra small computer system interface (UltraSCSI) connector is located on the main logic board back panel.

A.4.1 UltraSCSI Connector Diagram

A.4.2 UltraSCSI Connector Signals

Pin	Signal Name	Description
1	Gnd	Ground
2	Gnd	Ground
3	Gnd	Ground
4	Gnd	Ground
5	Gnd	Ground
6	Gnd	Ground
7	Gnd	Ground
8	Gnd	Ground
9	Gnd	Ground
10	Gnd	Ground
11	Gnd	Ground
12	Gnd	Ground
13	Gnd	Ground
14	Gnd	Ground
15	Gnd	Ground
16	Gnd	Ground
17	Termpower	Termpower
18	Termpower	Termpower
19	Not used	Undefined
20	Gnd	Ground
21	Gnd	Ground
22	Gnd	Ground
23	Gnd	Ground
24	Gnd	Ground
25	Gnd	Ground
26	Gnd	Ground
27	Gnd	Ground
28	Gnd	Ground
29	Gnd	Ground
30	Gnd	Ground
31	Gnd	Ground
32	Gnd	Ground
33	Gnd	Ground
34	Gnd	Ground
35	Dat<12>_	Data 12
36	Dat<13>_	Data 13
37	Dat<14>_	Data 14
38	Dat<15>_	Data 15
39	Par1 l_	Parity 1
40	Dat<0>_	Data 0
41	Dat<1>_	Data 1
42	Dat<2>_	Data 2
43	Dat<3>_	Data 3
44	Dat<4>_	Data 4
45	Dat<5>_	Data 5
46	Dat<6>_	Data 6
47	Dat<7>_	Data 7
48	Par0 l_	Parity 0
49	Gnd	Ground
50	Term_dis_	Term disable
51	Termpower	Termpower
52	Termpower	Termpower
53	Not used	Undefined
54	Gnd	Ground
55	Atn_	Attention
56	Gnd	Ground
57	Bsy_	Busy
58	Ack_	Acknowledge
59	Rst_	Reset
60	Msg_	Message
61	Sel_	Select
62	Cd_	Command
63	Req_	Request
64	IO_	In/Out
65	Dat<8>_	Data 8
66	Dat<9>_	Data 9
67	Dat<10>_	Data 10
68	Dat<11>_	Data 11

A.5 Reference for the Parallel Port Connector

The parallel port connector is a DB-25 type connector located on the main logic board back panel.

A.5.1 Parallel Port Connector Diagram

A.5.2 Parallel Port Signals

Pin	Mnemonic	Signal Name	Description
1	Data_Strobe_L	Data Strobe Low	Set low during forward channel transfers to latch data into peripheral device. Set high during reverse channel transfers.
2 to 9	Data[0..7]	Data0 Through Data7	The main data bus for the parallel port. Data0 is the least significant bit (LSB). Are not used during reverse channel transfers.
10	ACK_L	Acknowledge Low	Driven low by the peripheral device to acknowledge data byte transfer from host during forward channel transfer. Qualifies data being transferred to host in reverse channel transfer.
11	BUSY	Busy	Driven high to indicate the peripheral device is not ready to receive data during forward channel transfer. Used to send Data3 and Data7 during reverse channel transfer.
12	PERROR	Parity Error	Driven high by peripheral device to indicate an error in the paper path during forward channel transfer. Used to send Data2 and Data6 during reverse channel transfer.
13	SELECT_L	Select Low	Indicates the peripheral device is on-line during forward channel transfer. Used to send Data1 and Data5 during reverse channel transfer.
14	AFXN_L	Auto Feed Low	Set low by the host to drive the peripheral into auto-line feed mode during forward channel transfer. During reverse channel transfer, set low to indicate host can receive peripheral device data and then set high to acknowledge receipt of peripheral data.
15	ERROR_L	Error Low	Set low by the peripheral device to indicate an error during forward channel transfer. In reverse channel transfer, set low to indicate peripheral device has data ready to send to the host. Used to send Data0 and Data4.
16	INIT_L	Initialize Low	Driven low by the host to reset peripheral.
17	PAR_IN_L	Peripheral Input Low	Set low by the host to select peripheral device for forward channel transfer. Set high to indicate bus direction is from peripheral to host.
18		Signal ground	Signal ground
19		Signal ground	Signal ground
20		Signal ground	Signal ground
21		Signal ground	Signal ground
22		Signal ground	Signal ground
23		Signal ground	Signal ground
24		Signal ground	Signal ground
25		Signal ground	Signal ground

A.6 Reference for the Media Independent Interface (MII) Connector

The media independent interface (MII) connector is located on the main logic board back panel.

A.6.1 MII Connector Diagram

A.6.2 MII Connector Signals

Pin	Signal Name	Description
1	Pwr	Power
2	Mdio	Management data I/O
3	Mdc	Management data clock
4	Rxd3	Receive data 3
7	Rxd0	Receive data 0
8	Rx_dv	Receive data valid
9	Rx_clk	Receive clock
10	Rx_er	Receive error
11	Tx_er	Transmit error
12	Tx_clk	Transmit clock
13	Tx_en	Transmit data enable
14	Txd0	Transmit data 0
15	Txd1	Transmit data 1
16	Txd2	Transmit data 2
17	Txd3	Transmit data 3
18	Col	Collision detected
19	Crs	Carrier sense
20	Pwr	Power
21	Pwr	Power
22	Gnd	Ground
23	Gnd	Ground
24	Gnd	Ground
25	Gnd	Ground
26	Gnd	Ground
27	Gnd	Ground
28	Gnd	Ground
29	Gnd	Ground
30	Gnd	Ground
31	Gnd	Ground
32	Gnd	Ground
33	Gnd	Ground
34	Gnd	Ground
35	Gnd	Ground
36	Gnd	Ground
37	Gnd	Ground
38	Gnd	Ground
39	Gnd	Ground
40	Gnd	Power