Comtech EF Data SLM-5650A Installation And Operation Manual page 125

(CONFIG:) Rx  Buffer
Buffer: Src:RX-Sat Center: Y/N
Size:00001024
Use the  arrow keys to select Src, Center, ExtClk, Size, Mode, or Framing. Press [ENT].
Use the  arrow keys to scroll through the available settings. Select your setting. Press [ENT]
to finish.
Option Settings
Src Select Rx-Sat, Int, Tx-Terr, or ExtClk:
Center Select Yes or No.
By selecting Center, the buffer can be manually centered – the buffer is automatically centered when the
demodulator locks.
ExtClk Sets the frequency of the external G.703 clock:
Select RxDataRate, 5MHz, 10 MHz, or 20 MHz.
Size
Mode Buffer size format: Set to Bits or mSec.
Framing Select T1, E1, T2, or E2:
If selected, permits buffer to operate in a plesiochronous mode when running externally framed data. If
Mode is set to mSec and Rx data rate is 1544 kbps (T1), 2048 (E1), 6312 kbps (T2), or 8448 kbps
(E2), then the selected framing card is used to calculate the required buffer size so that the buffer will
slip properly.
While the framing selections show up in the menus regardless of which interface is plugged in, they
will only have effect if the Buffer Mode is set to mSec.
Front Panel Operation
Mode:Bits Framing (E)
• Rx-Sat is the recovered clock from the received carrier.
• Int is a clock synthesized from the modems reference (internal or external).
• Tx-Terr is the transmit clock supplied by the user.
• ExtClk is the external clock supplied by the user when using the optional G.703 interface.
• If Mode is set to Bits, the valid range is 128-4194304 (in 16 bit steps).
• If Mode is set to mSec (milliseconds), the valid range is 2-60 (in 1 mSec steps).
• T1 – G704 or None.
• E1 – G704 or None.
• T2 – G704, G743, G747, or None.
• E2 – G704, G742, G745, or None.
ExtClk
7–19
SLM-5650A Satellite Modem
Revision 10
MN-SLM-5650A