Mocomtech SLM-5650 - Manual (Page 85)

SLM-5650 Satellite Modem Revision 2
Front Panel Operation MN/SLM5650.IOM
4–15
Select: CONFIG: Receive: Buffer
Src Rx-Sat, Int, or Tx-Terr. 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.
Center Yes or No, the buffer is automatically centered when the demodulator
locks. By selecting center, the buffer can be manually centered.
Size If in Bits, the minimum size is 128 to a maximum of 4,194,304 in 16 bit
steps.
If in milliseconds (mSec), the minimum size is 2 to a maximum of 60 in
1 mSec steps.
Mode Bits or mSec, buffer size format.
Framing:
If selected this allows the buffer to operate in a plesiochronous mode
when running externally framed data.
If buffer 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
will be used to calculate the required buffer size so that the buffer will
slip properly.
T1 G704 or None
E1 G704 or None
T2 G704, G743, G747, or None
E2 G704, G742, G745, or None
IMPORTANT
While the framing selections show up in the menus regardless
of which interface is plugged in, they will only have effect if a
G.703 interface is plugged into the modem.
Select: CONFIG: Receive: Misc
Select Clk/DataPhase, BitOrdering or Eb/No Threshold, then press [E].
ClkPhase
DataPhase Rx Clock Phase, Normal or Inverted
Rx Data Phase, Normal or Inverted
BitOrdering Rx Bit Ordering (for BPSK compatibility), Standard or Non-Standard
Eb/No
Threshold 0.1 to 20 dB in 0.1 dB steps, this sets an Eb/No threshold such that when the
received carrier Eb/No is less than the set value, the Rx threshold alarm is set.
4.3.1.3 Select: CONFIG: Mode
Buffer: Src:RX-Sat Center: Y/N
Size:00001024 Mode:Bits Framing (
efE)
Rx Misc: Clk/DataPhase BitOrdering
Eb/No Threshold (
efE)