What does a channel manager do?
The circuit runs in two directions and both of them matter:
- Outbound: every change of rate, allotment or restriction is sent to all connected channels. The industry calls this ARI, for Availability, Rates and Inventory.
- Inbound: when a booking lands on a channel, the channel manager picks it up, files it in the PMS and republishes the new availability to the rest.
That second leg is the one that prevents overbooking, and its quality is measured in seconds: the longer a booking takes to propagate, the wider the window for two channels to sell the same room.
What gets synced
- Availability by room type and by day.
- Restrictions: minimum and maximum stay, closed to arrival, closed to departure and stop sell.
- Rate plans: non-refundable, bed and breakfast, promotions.
- Content, on some channels: photos, descriptions and amenities.
Mapping, which is where it breaks
Every room type and every rate has to be paired with its equivalent on the OTA. That is the mapping, and it is where most badly built connections fail. An unmapped room type that goes on sale is a room sold with no way to sync its allotment: a channel manager built properly refuses to sell it.
Is a channel manager the same thing as a PMS?
No, even though the two increasingly come together. Having them integrated into a single product saves you one layer of synchronisation and one contract, which is precisely where the problems tend to appear.