Verilink FrameStart FSM (34-00299.E) Product Manual - Manual (Page 145)

A-7
Serial Interface Pin Assignments, DCE Mode
*This refers to the DB-25 Serial interface connector on the back of the unit.
Function Abbrev. Direction
Pin #
DB-25* RS-232 V.35 EIA-530
Frame Ground FG n/a 1 1 A 1
Transmit Data TD Input 2 2 P 2
Receive Data RD Output 3 3 R 3
Request to Send RTS Input 4 4 C 4
Clear to Send CTS Output 5 5 D 5
Data Set Ready DSR Output 6 6 E 6
Signal Ground SG n/a 7 7 B 7
Data Carrier Detect DCD Output 8 8 F 8
Balanced Receiver Clock (B)RC Output 9 X 9
Balanced Data Carrier Detect (B)DCD Output 10 10
Balanced External Transmitter Clock (B)ETC Input 11 W 11
Balanced Transmitter Clock (B)TC Output 12 AA 12
Balanced Clear to Send (B)CTS Output 13 13
Balanced Transmit Data (B)TD Input 14 S 14
Transmitter Clock TC Output 15 15 Y 15
Balanced Receive Data (B)RD Output 16 T 16
Receiver Clock RC Output 17 17 V 17
Local Loopback Loop 3 Input 18 18 J 18
Balanced Request to Send (B)RTS Input 19 19
Data Terminal Ready DTR Input 20 20 H 20
(not used) n/a 21 21 21
Balanced Data Set Ready (B)DSR Output 22 22
Balanced Data Terminal Ready (B)DTR Input 23 23
External Transmitter Clock ETC Input 24 24 U 24
(Not Used) n/a 25 25 25