3Com 3C410012A - OfficeConnect Remote 531 Access Router Getting Started Manual page 50

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PPENDIX ECHNICAL NFORMATION
V.35/V.36 WAN Cable
The WAN port can be configured to support V.36 signaling at data
transfer rates up to 2.048 Kbps. Note the following pinouts when
buying or making up a suitable WAN cable.
Autosense pins must be connected in order for the cable to
function correctly.