A Technical Information; Lan Connector Interfaces; Wan Connector Interface (531 Only; Isdn Connector Interface - 3Com 3C410012A - OfficeConnect Remote 531 Access Router Getting Started Manual

A
Specifications

LAN Connector Interfaces

There are two LAN interfaces. Only one of these connections can
be used at any one time.
10Base2 via a BNC connector.
10Base-T via an RJ45 connector socket for UTP.

WAN Connector Interface (531 only)

The WAN interface is a 25-way D-type female connector which can
be configured to support one of the following.
V.11 (X.21) for speeds up to 2.048 Mbps.
V.28 (V.24/RS232) for speeds up to 19.2 Kbps.
V.35/V.36 for speeds up to 2.048 Mbps.

ISDN Connector Interface

The ISDN interface is an RJ45 socket. This allows connection to a
2B+D basic rate ISDN service.
Built-in NT-1 termination with 2B1Q interface
EuroISDN
1TR.6
North American National ISDN-1 (NI-1)
AT&T and Northern Telecom custom ISDN signaling
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