Config: Clocks Rx Buffer/Clock - Comtech EF Data CDM-625 Installation And Operation Manual

CDM-625 Advanced Satellite Modem
Front Panel Operation
5.4.5.2 CONFIG: Clocks
Clk=Rx-Sat
Buffer-Size = 00016bytes(00002ms) Center
se the arrow keys to select from the choices shown in parentheses. Then, to edit the Rx
U ▲ ▼
clock options, use the
revise the digit. Press ENTER when done.
Rx-Sat
Tx-Terr
Int(SCT)
Ins(ert)
Buffer-Size indicates the size in bytes (and size in milliseconds) of the Plesiochronous/ Doppler
Buffer. Edit each digit of the buffer size using the
Note: the minimum buffer size and step size usually the same, and are dictated by several rules:
If Framing is Insert:
If D&I Type is:
E1 @ 1920kbps
T1-D4
T1-ESF
E1
If Framing is D&I++:
If n =
1,3,5
2,6,10,15,30
9
4,12,20
25
18
7,21
8,24
27
11
13
14
16
17
19
22
23
26
28
29
31
Rx Buffer/Clock
(Rx-Sat,TxTerr,Int(SCT),Ins)
◄ ►
arrow keys to select the digit to edit, then use the
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.
In this timing mode, data is clocked out of the receive buffer using the external
transmit clock.
Data is clocked out of the buffer using the same reference that drives the modem
Internal(SCT).
Sets the buffer clock to the Insert stream. Available only if Rx framing is D&I and Rx
interface is G.703.
Step size (bytes)
1024 or 4ms
24 x n or 3ms
48 x n or 6ms
32 x n or 4ms
Step size (bytes)
720
1440
2160
2880
3600
4320
5040
5760
6480
7920
9360
10080
11520
12240
13680
15840
16560
18720
20160
20880
22320
5–23
MN-0000036 (Ref MN/CDM625.IOM)
arrow keys, then press ENTER.
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Revision 1
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