Serial Port and User Equipment Connections
Memotec Inc. 5-9
5.6 Serial Port Connector and Custom HD-26 Cable Set
Connectivity
Table 5-1 on the next page provides the pinout and directionality of signals on the SDM-
9120/9220/9230 serial port connectors and the custom HD-26 cable that connects to these
connectors.
NOTE: For V.24 and V.35, refer to V.35 for the ITU circuit number
Descriptions within parentheses refer to X.21 only
The abbreviation n/a means not applicable.
The abbreviation n/s means not supported.
Main Board Cable V.35 TIA-232/V.24 TIA-530 TIA-449/V.36 X.21
Interface
HD-26
Female
HD-26 Male ISO 2593
DB-25/ISO -
2110
DB-25
DB-37/ISO-
4902
DB-15/ISO-
4903
Connector
Net-
Name
Pin
Pin
DTE
Pin
DCE
Circuit Pin Signal Pin Signal Pin Signal Pin Signal Pin
Signal
from
Description
TXDA 2 2 3 103 P TXD 2 TXDA 2 TXDA 4 T[A] 2 DTE Transmit Data
(Transmit on
wire)TXDB 14 14 16 103 S
n/a n/a
TXDB 14 TXDB 22 T[A] 9 DTE
RXDA 3 3 2 104 R RXD 3 RXDA 3 RXDA 6 R[A] 4 DCE Receive Data
(Receive on
wire)RXDB 16 16 14 104 T
n/a n/a
RXDB 16 RXDB 24 R[A] 11 DCE
TXCA 15 15 15 114 Y TXC 15 TXCA 15 TXCA 5 S[A] 6 DCE Transmit Clock
(Signal element
timing)TXCB 12 12 12 114 AA
n/a n/a
TXCB 12 TXCB 23 S[A] 13 DCE
RXCA 17 17 24 115 V RXC 17 RXCA 17 RXCA 8 B[A] 7 DCE Receive Clock
(Signal ele-
ment timing)RXCB 9 9 11 115 X
n/a n/a
RXCB 9 RXCB 26 B[B] 14 DCE
XTXCA 24 24 17 113 U XTXC 24 XTXCA 24 XTXCA 17
n/a n/a
DTE External
Transmit Clock
XTXCB 11 11 9 113 W
n/a n/a
XTXCB 11 XTXCB 35
n/a n/a
DTE
DTRA 20 20 6 108 H DTR 20 DTRA 20 DTRA 12 C[A] 3 DTE Data Terminal
Ready (Control
on wire)DTRB 23 23 22
n/a n/a n/a n/a
DTRB 23 DTRB 30 C[B] 10 DTE
Table 5-1: Serial connector and NetPerformer custom HD-26 cable set
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