channel configuration in 1 star network (3 routers and 1 cordinator)

sir,
in my star network using 3 as routers and 1 as coordinator, whether all xbee I have to give same channel or different channel(CH)

can u please give configutration parameters for my star network with 3 routers and 1 cordinator

If they are all Zigbee or ZB enabled module, then they all need to have the same channel mask (SC) and PAN ID (ID). If the routers do not have the same channel (CH) as the coordinator, the you need to issue a network reset on the routers (ATNR0).