Specifications

CHAPTER 4
Expansion Features
60 The PCI Bus Communications Slot
PCI Bus Communications Slot Connector 4
The PCI bus based communications slot connector is a 112-pin half-height microchannel
connector. A communications card mounts vertically in the connector and its I/O
connector is accessed through the communications port access hole on the right hand
side of the back panel. The size constraints of a communications card are 1.57 inches (40
mm) wide by 6 inches (152 mm) long.
A maximum of 2.5 watts of power is allocated to the communications slot. The
maximum possible current ratings for each power line are:
Voltage Current
+5 V 500 mA
+12 V 100 mA
Trickle +5 V 5 mA
–5 V 20 mA
Table 4-12 lists the pin assignments of the PCI bus communications slot.
Table 4-12 Pin assignments for the PCI bus communications slot connector
Odd-numbered pins Function Even-numbered pins Function
1 /DCD 2 /DTR
3 /CTS 4 /RTS
5 RxD 6 TxD
7 IN_SENSE 8 SCC_ENAB
9 INT_MIC 10 MIC_SENSE
11 MIC_RET 12 EXT_AUD_L
13 Reserved 14 EXT_AUD_RET
15 GND 16 +12 V
17 -5 V 18 +12 V
19 SYS_WAKEUP 20 Trickle +5
21 GND 22 GND
23 A1 24 A0
25 A3 26 A2
27 +3.3 V 28 +3.3 V
29 A5 30 A4
31 A7 32 A6
33 +5 V 34 +5 V
continued