Cheap multiport terminal servers are available surplus.[1]
This one is $69 for 24 ports.  You&#x27;ll need a 48VDC power supply for it, though; this must have been for a telco installation.<p>[1] <a href="http:&#x2F;&#x2F;www.unixsurplus.com&#x2F;product&#x2F;digi-cm-32-console-terminal-server-32-ports" rel="nofollow">http:&#x2F;&#x2F;www.unixsurplus.com&#x2F;product&#x2F;digi-cm-32-console-termin...</a>