TDM

The question does not make sense to me.

The high speed outbound continuous carrier from the hub, is received at all remote sites. Within the data stream are various packets, joined end to end without any interruption of the timed data stream, intended for particular remote sites. The remote sites recognise and extract such packets to forward to their attached customer PC. Such an outbound carrier is called TDM (time division multiplex) since the data stream comprises packets that have come from various internet servers and are being multiplexed together in time sequence before transmission of the composite data stream from the hub.

The return link carrier slot from the remotes to the hub is an intermittent operation. The remote sites transmit occasional bursts, all on the same frequency, but only one site at a time to avoid interference. is is called TDMA, time division multiple access. A site typically transmits as burst when a mouse is clicked or series of bursts when a long file is being sent.

Is there an alternative to TDMA for the inbound ?.
Yes. You can use SCPC type modems. Each remote site has a permanent continuous carrier to the hub. This is ideal for voice, GSM backhaul, large business, ISP or internet/phone booth cafe.  Traffic is not subject to congestion by other people or FAP and you have steady dedicated bit rates 24/7.  Use iDirect 5000 series modems or Comtech CDM570.

Best regards, Eric.