Comtech EF Data SLM-5650A - Manual (Page 100)

SLM-5650A Satellite Modem Revision 8
Front Panel Operation MN-SLM5650A
5–18
CONFIG: Rx  Buffer
Buffer: Src:RX-Sat Center: Y/N ExtClk
Size:00001024 Mode:Bits Framing (E)
First, use the  arrow keys to select Src, Center, ExtClk, Size, Mode, or Framing, and then
press [ENT]. Then, use the  arrow keys to scroll through the available settings. Press [ENT]
once again when done.
Option Settings
Src Rx-Sat, Int, Tx-Terr, or ExtClk. Note the following:
• 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.
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 If Mode is set to Bits – valid range is 128–4194304 (in 16 bit steps).
If Mode is set to mSec (milliseconds) – valid range is 2–60 (in 1 mSec steps).
Mode Buffer size format: Set to Bits or mSec.
Framing If selected, permits buffer to operate in a plesiochronous mode when running externally framed
data. Select T1, E1, T2, or E2. Note the following:
• T1 – G704 or None.
• E1 – G704 or None.
• T2 – G704, G743, G747, or None.
• E2 – G704, G742, G745, or None.
If Mode is set to mSec and Rx data rate is 1544 kbps (T1), 2048 (E1), 6312 kbps (T2), or 8448
kbps (E2), and then the selected framing card will be 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.
CONFIG: Rx  Misc
Rx Misc: Clk/DataPhase BitOrdering
Eb/No Threshold (E)
Use the arrow keys to select Clk/DataPhase, BitOrdering, or Eb/No Threshold, and then
press [ENT].