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Edit: did i get this correct? currently the huawei ONR is acting as modem/router, and the connected singtel mesh router is running on AP mode?
Yes. ONR is the main router. SingTel Mesh Router (or the older AC Plus or AC Elite) will automatically run in AP mode when connected to the ONR.
Do you have other routers? Do you have Singtel TV?
Once you got Singtel to bridge the ONR, most likely you can no longer use the SingTel Mesh Router as the main router. You need to use your own router.
Usually Singtel may reconfigure the ONR in such a way.
1) One port bridged port -- no VLAN, you can connect 3rd party routers from this port. SingTel routers can not be used.
2) ONR ports (one or two or three) for SingTel TV boxes only, no internet access.
ONR has some advantage as well if you need to put the router in the DB Box. It does not have wireless function so your wireless function is not affected.
1. For example: two wireless AP setup if you have weak wireless in one room, say the master room.
ONR -- patch panel -- Ethernet ports in living room and master room -- main AP in living room and auxiliary AP in master room.
If using bridged ONR or ONT, it is a bit troublesome if you only have one Ethernet port in the living room. In the end you may need to have three routers, one in the DB box and the other two as APs.
ONT -- main router -- patch panel -- Ethernet ports in living room -- second router as main AP.
3rd router in master room as AP.
2. Another example: Single wireless AP setup but you need wired access in the study room for a desktop PC
ONR -- patch panel -- Ethernet ports in living room -- main AP
Study room Ethernet port -- desktop PC.
If using bridged ONR or ONT, it is a bit troublesome, now you need one router in the DB box and the other one in the living room as AP.
ONT -- main router -- patch panel -- Ethernet ports in living room -- second router as main AP
Study room Ethernet port -- desktop PC.