This object reports the name of a T4 external timing output, a port or interface through which the device distributes its own derived clock signal outward to other downstream equipment, as opposed to T0 which is the device's own reference input. It matters because it identifies which physical output an admin needs to check when a downstream device complains about receiving bad timing from this box. A value like 'BITS-Out-1' would tell the admin exactly which physical output port to inspect if a downstream piece of equipment reports a timing problem traced back to this device.