This read-write INTEGER, ctc(1) or itc(2), specifies the transmit clocking mode used by the near-end IMA group, though ITC is not available on ausm8(B) and only the default value ctc is actually supported. An administrator uses this to identify how the local IMA group derives its transmit timing, understanding that in practice only common transmit clocking (ctc) is usable on this hardware. For example, an operator would not expect to successfully configure itc(2) mode on an ausm8(B) card given the platform limitation noted in the description.