Comtech EF Data CDM-625, Инструкция по установке и эксплуатации

Страница: 96 / 322

CDM-625 Advanced Satellite Modem Revision 1
Front Panel Operation MN-0000036 (Ref MN/CDM625.IOM)
Otherwise:
If data rate is Step size (bytes)
1544 kbps (T1) 1158
2048 kbps (E1) 1024
6312 kbps (T2) 1578
8448 kbps (E2) 528
Otherwise 2, with minimum size of 16 bytes
CONFIG: Clocks
Æ
Rx Buffer/Clock
Æ
Center
Selecting
Center
displays the following message:
Press ENTER to Center the Buffer
otherwise, press CLEAR
Follow the instructions on the screen.
5.4.5.3 CONFIG: Clocks
Æ
G.703 Clock Extension
G.703 Clock Extension:
Mode Interface (
34
)
This operating mode is explained fully in
Section 9.11: G.703 Clock Extension.
The user may
select the mode and the interface type using this menu.
If the user selects
Mode
, the following sub menu is displayed:
G.703 Clock Extension Mode: RxEnable
(None, TxLock, RxEnable) (
v
)
The user may select one of the following choices:
None
All G.703 Clock extension modes are disabled.
TxLock
The CDM-625 (operating in a non-G.703 mode) locks its transmit clock timing to an
externally presented G.703 reference signal.
RxEnable
The CDM-625 (operating in a non-G.703 mode) synthesizes a G.703 timing reference
from the Rx satellite signal, regardless of its actual data rate.
If the user selects
Interface
, the following sub menu is displayed:
G.703 Clock Extension:
Interface: T1 (T1, E1-B, E1-U) (
v
)
If
TxLock
is selected as the mode, the transmit timing of the CDM-625 will be
locked
to the
timing presented to interface type selected here.
5–24