SCO链路是对称的：主设备发出一个SCO数据包，然后在下一个时隙中从设备发出一个SCO数据包，因此每一个方向的数据率是一样的。

SCO links are symmetric: the master sends a SCO packet, then the slave sends a SCO packet in the following slot, so the data rate in each direction is the same.

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而在主设备定向发给从设备的信息的指引下，从设备也只能在偶数时隙上开始传输。

A slave device may only start transmitting on an odd numbered slot, following a message from the master which was directed specifically to that slave.

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SCO数据包时隙长度始终是1时隙。

SCO packets are always 1 slot in length.

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