Comtech EF Data CDM-700 - Manual (Page 82)

CDM-700 High Speed Satellite Modem Revision 5
Front Panel Operation MN/CDM700.IOM
6–28
If Intfc1 Port1 Rx: Æ Buf is selected:
Intfc1 Port1 Rx Buffer:
Frame-Type Size ReCenter
Select Frame-Type, Size, or Recenter using the ◄ ► arrow keys. Press
ENTER
.
If Intfc1 Port1 Rx Buffer: Æ Frame-Type is selected:
Intfc1 Port1 Rx Frame:
G.751 (1536 Bits) ( E)
Select Frame-Type, Size, or Recenter using the ◄ ► arrow keys. Press
ENTER
.
The Frame Type and the number of bits in the frame displayed are dependent on the choice
selected under Intfc1 Port1: Æ Type. In the above example, G.751 (1536 Bits) shows the frame
when the Port Type is E3. The available Frame Type / (Bits) are as follows:
Selected Port Type
(as displayed) Frame Type
(Frame Size, in bits, as displayed)
E3
None - default
G.751 (1536 Bits)
G.753 (2148 Bits)
T3
None - default
G.752 (4760 Bits)
STS1
None - default
STS-1 (6480 Bits)
The minimum buffer size is determined by the the number of bits in the frame and the maximum
buffer size is based upon the integral number of frames that can fit in the buffer memory.
If Intfc1 Port1 Rx Buffer: Æ Size is selected:
Intfc1 Port1 Rx Buffer:
10.0 mSec (0344.064 Bits)( E)
Edit the Rx Buffer Size by selecting the digit to be edited, using the ◄ ► arrow keys. The value
of the digit is then changed using the ▲ ▼ arrow keys. Press
ENTER
.
The Rx Buffer is programmed in 0.5 ms steps rounded to the increment closest to an integral
number of bits based upon the Frame Type. The maximum buffer size is:
G.751 61 ms
G.752 44 ms
G.753 61 ms
STS-1 40 ms
The Rx buffer has a minimum value of 0.5 ms (default). Selecting the minimum value and
programming Rx-CLK for Rx-SAT disables the buffer and sets it to minimum.