Juniper CTP151 Platform, Hardware Manual, Page: 46 / 104

X.21 Connector Interface Signal Pinouts (DB-15 Female DCE)
Table 18 on page 37 lists the X.21 interface signal pinouts for the HD-26 connector to the female DB-15
connector for the CTP151 platform.
Table 18: X.21 DCE Connector Interface Signals for HD-26 to Female DB-15
Description DB-15 Pin HD-26 Pin
Receive Data—A (output from CTP) 4 1
Receive Clock—A (output from CTP) 6 2
Transmit Clock—A (input to CTP) 7 4
Transmit Data—A (input to CTP) 2 5
Signal Out—A (output from CTP) 5 8
Signal Out—B (output from CTP) 12 9
Signal In—B (input to CTP) 10 10
Signal In—A (input to CTP) 3 11
Receive Data—B (output from CTP) 11 14
Receive Clock—B (output from CTP) 13 15
Transmit Clock—B (input to CTP) 14 17
Transmit Data—B (input to CTP) 9 18
Ground 8 24, 26
X.21 Connector Interface Signal Pinouts (DB-15 Male DTE)
Table 19 on page 37 lists the X.21 interface signal pinouts for the HD-26 connector to the male DB-15
connector for the CTP151 platform.
Table 19: X.21 DTE Connector Interface Signals for HD-26 to Male DB-15
Description DB-15 Pin HD-26 Pin
Transmit Data—A (output from CTP) 4 1
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