Unit installation

Appendix D Command Language Installation and Operation Manual D-2 Front Panel Parameters FCD-E1
Table D-1. System Configuration Parameters
Designation Function Values Configuration Guidelines CLK_MASTER
Selects the master system timing reference.
INT – Internal oscillator. ML – Locked to the recovered main link receive clock SL – Locked to the recovered sublink receive clock CH_1, CH_2 – Locked to the external clock
supplied to the corresponding user data channel, provided the channel timing mode is DTE2 Default: INT
Select ML or SL for connection to carrier lines. Select one of the data channels for connection to a data network. Select INT at one end and ML at the other end for point- to-point lines.
CLK_FBACK
Selects the alternate (fallback) system timing reference, for use in case the master reference fails.
NONE – No fallback source is used. In this case, the
internal oscillator is automatically selected when the master reference fails ML – Locked to the recovered main link receive clock SL – Locked to the recovered sublink receive clock CH_1, CH_2 – Locked to the external clock supplied to the corresponding user data channel, provided the channel timing mode is DTE2 Default: NONE
Select a source different from that selected as master. Select NONE to disable switching to the fallback source. In this case, the default fallback clock source is the FCD-E1 internal clock oscillator.