Unit installation

Installation and Operation Manual Appendix D Command Language FCD-E1 Front Panel Parameters D-9
Table D-4. Data Channel Configuration Parameters (Cont.)
Designation Function Values Configuration Guidelines CLOCK MODE
Selects the clocking mode of this user data channel. For the Ethernet interface, only the DCE mode is supported, and therefore it cannot be changed
DCE – FCD-E1 operates as a DCE and provides transmit and receive clocks to the synchronous user DTE. DTE1 – FCD-E1 supplies the receive clock to the user equipment and accepts the user transmit clock. DTE2 – FCD-E1 requires transmit and receive clocks from the user equipment. Default: DCE
Select the clock mode in accordance with the type of equipment connected to the user data channel: • DCE – For direct connection to a synchronous DTE. • DTE1 – For connection via a modem with external
clock or another equipment that accepts a receive clock and outputs a transmit clock.
• DTE2 – For connection via a modem or other type of
equipment (such as a multiplexer), that provides both receive and transmit clocks. You must select this mode when FCD-E1 timing is to be locked to an external clock (see CLK_MASTER in Table D-1), or the external clock is intended for use as a fallback reference (see CLK_FBACK in Table D-1).
Notes: 1. The accuracy and stability of the external source clock must be compatible with system requirements, otherwise severe disruptions in network operation may
occur.
2. The DTE2 mode can be selected for only one channel, except in case both channels are connected to equipment using the same timing source.
INTERFACE
Displays the user data channel interface type
For CH1 – V.35, RS-530, X.21 RS-449 For CH2 – V.35, RS-530, X.21 RS-449, RS-232, ETUB (10BaseT bridge)
Read-only parameter – displays the user data channel interface, installed for the current channel
CTS
Selects the state of the CTS line in the user data channel (not applicable to Ethernet interface)
ON – CTS continuously on =RTS – CTS line follows the RTS line Default: ON
Select in accordance with the desired operation mode of the channel. In general, you should use =RTS for operation in the polling mode. In this case, when the RTS line is OFF, the local FCD-E1 channel continuously sends MARK in its main link timeslots.
Note: When the CTS line is not active (CTS=OFF), the user data interface generates an “all-ones” signal, transmitted via the main link to the far end.