Installation guide

Appendix A. Electrical Interfaces

Table A-1 shows the commonly used electrical interfaces for WAN connections. Each link in a 2-port or 4-port ICP

can be individually conﬁgured to EIA-232, EIA-449, EIA-530, or V.35. The 8-port ICP provides EIA-232 only. If

you select another value for an 8-port board, it will be ignored.

Note: The Freeway is always Data Terminal Equipment (DTE), while modems are Data Communications

Equipment (DCE).

Table A-1. Commonly Used Electrical Interfaces

Signal Name

Source

EIA-232 EIA-530 EIA-449 V.35

Mnemonic Pin Mnemonic Pins

(A/B)

Mnemonic Pins

(A/B)

Mnemonic Pins

Shield - - 1 - 1 - 1 - A

Transmitted

Data

DTE BA 2 BA 2 / 14 SD 4 / 22

Received Data DCE BB 3 BB 3 / 16 RD 6 / 24 104 R / T

Request to

Send

DTE CA 4 CA 4 / 19 RS 7 / 25 105 C

Clear to Send DCE CB 5 CB 5 / 13 CS 9 / 27 106 D

DCE Ready

(DSR)

DCE CC 6 CC 6 / 22 DM 11 / 29 107 E

DTE Ready

(DTR)

DTE CD 20 CD 20 / 23 TR 12 / 30 108 H

Signal Ground - AB 7 AB 7 SG 19 102 B

Receive Line

Signal Detect

(DCD)

DCE CF 8 CF 8 / 10 RR 13 / 31 109 F

Transmit

Signal Element

Timing

DCE DB 15 DB 15 / 12 ST 5 / 23 114 Y/AA