Comtech EF Data CDM-625 - Manual (Page 131)

CDM-625 Advanced Satellite Modem Revision 15
Front Panel Operation MN-CDM625
5–31
5.2.1.5.3 CONFIG: Clocks  Clk-Ext (G.703 Clock Extension)
Sect. 9.1.1 CLOCK MODES AND DROP & INSERT (D&I).
G.703 Clock Extension:
Mode Interface ()
Use the ◄ ► arrow keys to select Mode or Interface, and then press ENTER.
CONFIG: Clocks  Clk-Ext  Mode
G.703 Clock Extension Mode: RxEnable
(None, TxLock, RxEnable) ()
Use the ▲▼ arrow keys to select None, TxLock, or RxEnable, and then press ENTER. Note the
following:
Selection Function
None All G.703 Clock extension modes are disabled.
TxLock
The unit (operating i n a non -G.703 m ode) l ocks i ts t ransmit c lock t iming t o an ex ternally
presented G.703 reference signal.
RxEnable
The unit (operating in a non -G.703 mode) synthesizes a G .703 timing reference from the Rx
satellite signal, regardless of its actual data rate.
CONFIG: Clocks  Clk-Ext  Interface
G.703 Clock Extension:
Interface: T1 (T1, E1-B, E1-U) ()
When selecting TxLock as the mode, the transmit timing of the unit locks to the timing
presented of the interface type selected here.
When selecting RxEnable as the mode, the unit generates a timing signal of the interface type
selected here.
The two interface types do not need to be the same for a particular link. For
example, if it is required to generate an E1 reference signal at the remote site, but
at the local end only a T1 reference signal is available, this is supported.