Chapter 5. Configuration Menu5-6 TDU 120e User Manual 61202156L2-1TIMING MODESelects the clock source for transmission toward the net-work from the NI.Choices: N ETWORK , BASE DTE, B ASE DS-1, N ORMAL(CSU) (only with DSX-1 option card), U-BR1TE (onlywith U-BR1TE option card), INTERNAL , and SECONDARY(SI) (only with secondary port option card).The selected clock option always designates the clock source fortransmission. Clocking necessary for receiving data is always recoveredfrom incoming data.
