I am not sure if such a thing as a local talk hub exist - as local talk is not configured like Ethernet, which is in a "star" configuration. Localtalk is a peer-to-peer network.
Since Ethernet includes 10BaseT, 10Base2, 10Base5 and Wireless it is configured in a star, daisy chain, bus or "cloud".
LocalTalk is configured in a daisy chain, one adapter connected to the next and so on with automatic termination at each end.
Farallon (creator of PhoneNet) used to include a nice booklet with their adapters that detailed how to connect them. It showed daisy chain, bus and star. Since LocalTalk / PhoneNet is a variation of RS-485 and thus a multi-drop network it properly should be wired as a bus or daisy chain. But since it's such a slow network it can be quite forgiving if the network isn't too long. Farallon's booklet listed the maximum length at 3000 feet (IIRC) with reductions for variations. You get the longest length using twisted pair 22 AWG wire in a bus configuration (the cable goes from jack to jack and you use drop cables from the jack to the PhoneNet adapter).
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