4230-mmm & 4230-mmx.ib.rev4.doc
Page 6 of 17
17/10/2007
Switch settings
MMM-4230 45Mb version:
The MMM-4230 Multiplexer works in a channel protection mode. The necessity for protection arises if the data rate
of the inputs exceeds the maximum allowable for an MMM-4230 Transmitter (43.5Mb/s). Without protection all
used channels would suffer errors. With protection, the available data rate can be divided among the input channels
and if a channel tries to exceed its allocation only that channel is adversely affected.
A switch, SW1, on the MMM-4230 sets the maximum data rates for each ASI input.
For
204 byte packets
the following allocation is possible.
Channel Data Rate Assignment
Switch 1 Position
I/P 1
I/P 2
I/P 3
I/P 4
0 43.5
- - -
1 38.26
5.46
- -
2 32.8
10.93
-
-
3 27.33
16.4
- -
4 21.86
21.86
- -
5
32.8 5.46 5.46 -
6 27.33
10.93
5.46
-
7 21.86
16.4
5.46
-
8
21.86 10.93 10.93
-
9
14.6 14.6 14.6 -
A Variable
B 21.86
10.93
5.46
5.46
C
16.4 16.4 5.46 5.46
D
16.4 10.93 10.93 5.46
E
10.93 10.93 10.93 10.93
F Remote
For
188 byte packets
the following is true –
Channel Data Rate Assignment
Switch 1 Position
I/P 1
I/P 2
I/P 3
I/P 4
0 40.10
- - -
1 35.26
5.03
- -
2 30.22
10.07
- -
3 25.18
15.11
- -
4 20.14
20.14
- -
5 30.22
5.03
5.03
-
6 25.18
10.07
5.03
-
7 20.14
15.11
5.03
-
8
20.14 10.07 10.07
-
9
13.47 13.47 13.47
-
A Variable
B 20.14
10.07
5.03
5.03
C 15.11
15.11
5.03
5.03
D
15.11 10.07 10.07 5.03
E
10.07 10.07 10.07 10.07
F Remote
Note: For Channel allocation selection by SNMP control the Data Rate switch (SW1) must be set to “F”.
These data rates are only the maximum allowed for the channel. Any lower rate may be used.
SW1
