ISDN terminal adapter suggestions

There are several different terminal adapters that you can use.

The suggested external Integrated Services Digital Network (ISDN) terminal adapter, or ISDN modem, is the 3Com/U.S. Robotics Courier I ISDN V.Everything. It supports V.34 analog modem connections, V.90 (X2), V.92, and multilink PPP over ISDN in both origination and answer modes on the system. It also automatically supports Challenge Handshake Authentication Protocol (CHAP) over the ISDN PPP connection. The following ISDN terminal adapters are also available: Zyxel Omni.net Plus TA, Zyxel Omni.net LCD plus TA, and ADtran ISU 2x64 Dual Port.

Connections that originate from the system. CHAP challenges that originate from the receiving side are answered by the Courier I terminal adapter, while negotiating Password Authentication Protocol (PAP) authentication with the system. PAP responses do not appear on the ISDN connection.
Connections that the system answers. The Courier I requires CHAP authentication by the calling side if the answer configuration causes the system to open authentication with a CHAP challenge. If the system opens authentication with PAP, the Courier I terminal adapter authenticates with PAP.

If you are using a pre-1999 Courier I modem, verify that the Courier I modem is connected to your system by a V.35 cable to get the best performance from your ISDN connection. An RS-232 to V.35 modem cable is supplied with the Courier I modem; however, older versions of this cable have the wrong gender V.35 connector. Contact 3Com/US Robotics Customer Support for a replacement.

According to 3Com/US Robotics, the V.35 version of this terminal adapter is no longer from third party suppliers, though some V.35 versions might still come from third-party suppliers. The RS-232 version is still suggested at somewhat reduced performance on the system because RS-232 connections are limited to 115.2 KB.

Be sure to set the V.35 line speed on the system to 230.4 kbps.

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ISDN terminal adapters