CDM-600L Satellite Modem
Revision 0
Front Panel Operation
MN/CDM600L.IOM
6–18
CONFIG:CLOCKS:
RX
BUFFER/CLOCK
U
sing the [
←
] [
→
] arrow keys keys, select one of the three parameters on the screen to
edit.
Edit the RX clock options
using the [
↑
] [
↓
] arrow keys, then press ENTER
RX-SAT
Sets the Receive buffer clock source to the satellite clock (The receive
buffer will be bypassed.) Note: This will fix the buffer size to minimum.
TX-TERR
In this timing mode data is clocked out of the receive buffer using the
the external transmit clock.
EXT-REF
In this timing mode data is clocked out of the receive buffer using an
external reference clock.
INS
Sets the buffer clock to the Insert stream (INSERT mode only).
Buffer-Size indicates the size, in bytes, of the Plesiochronous/Doppler Buffer. In
parantheses after this, the size in milliseconds is shown. Edit each digit of the buffer size
using the [
↑
] [
↓
] arrow keys. Press ENTER.
Note:
When the Rx data rate is set to one of the four G.703 rates, the minimum buffer
size and step size are limited to the value shown in the table below. In addition, Insert
Framing follows the same rule, regardless of n x 64 data rate, depending upon whether
the Insert Type is T1 or E1. If none of these cases is true, the minimum buffer size is
16 bytes with a step size of 2 bytes.
RX Data Rate
Buffer Size
1544 kbps (T1) or T1-D4, ESF
1158 bytes or 3 milliseconds for D4
(6 milliseconds for ESF)
2048 kbps (E1) or E1-CCS, CAS
1024 bytes or 4 milliseconds
6312 kbps (T2)
1578 bytes or 2 milliseconds
8448 kbps (E2)
528 bytes or 0.5 milliseconds
If CENTER is selected, the following sub-menu is displayed:
CONFIG:
CLOCKS:
RX
BUFFER/CLOCK: CENTER
Follow the instructions on the screen.
CLK= RX-SAT (RX-SAT,TX-TERR,EXT-REF,INS)
BUFFER-SIZE = 00016bytes(00002ms) CENTER
PRESS ENTER TO CENTER THE BUFFER
OTHERWISE, PRESS CLEAR
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