Memotec CX950

CX950 Hardware Reference Manual
4-16
3021M100-002
4.4.4 X.21 Serial I/O Card Signal Handling
The following table identifies the X.21 signals supported on the I/O port
connector. The information identifies the pin through which the signal passes on
the DB-15 port connector.
4.4.5 X.21 Serial I/O Card Power Consumption
Power consumption for the X.21 Serial I/O card is 1.5 Watts (5.15 BTU/hr).
Table 4-4 Signal Pin-Outs for X.21 Port
X.21
Signal
Circuit Function ITU-T
DB-15
Pin No.
Signal
DTE
Direction
DCE
F. GND Protective Ground 101 1 n/a n/a
TXDA Transmitted Data (Set A) 103-A 2 Out In
DTRA Data Terminal Ready (Set A) 108-A 3 Out In
RXDA Received Data (Set A) 104-A 4 In Out
DCDA Data Carrier Detect (Set A) 109-A 5 In Out
RXCA Receive Clock (Set A) 115-A 6 In Out
DTE Signal Element Timing (Set A) 7 not used not used
S. GND Signal Ground 102 8 n/a n/a
TXDB Transmitted Data (Set B) 103-B 9 Out In
DTRB Data Terminal Ready (Set B) 108-B 10 Out In
RXDB Received Data (Set B) 104-B 11 In Out
DCDB Data Carrier Detect (Set B) 109-B 12 In Out
RXCB Receiver Clock (Set B) 115-B 13 In Out
DTE Signal Element Timing (Set B) 14 not used not used
Reserved 15 not used not used