Specifications

same as those on the PCI bus communications slot, listed in Table 4-12, with the PCI bus
signals removed and the key slot location added.
Table 4-13 Pin assignments for a universal serial modem card
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 Not connected 14 EXT_AUD_RET
15 Gnd 16 +12 V
17 –5 V 18 Not connected
19 SYS_WAKEUP 20 Trickle+5
21 GND 22 Not connected
Key (pin 23) Key slot (notch) Key (pin 24) Key slot (notch)
Key (pin 25) Key slot (notch) Key (pin 26) Key slot (notch)
27 Not connected 28 Not connected
29 Not connected 30 Not connected
31 Not connected 32 Not connected
33 Not connected 34 +5V
35 Not connected 36 Not connected
37 Not connected 38 Not connected
39 Not connected 40 Not connected
41 Not connected 42 Not connected
43 Not connected 44 Not connected
45 Not connected 46 Not connected
47 GND 48 Not connected
49 Not connected 50 Not connected
51 Not connected 52 Not connected
53 Not connected 54 Not connected
55 Not connected 56 Not connected
continued