44
MDS 9810 Installation and Operation Guide
MDS 05-3301A01, Rev. C
When the
SEND
command is issued without parameters, the cumulative
retransmission count is shown. A value of 1 represents the default selec-
tion, meaning “normal, non-robust operation.” Values greater than 1
successively improve the chance of successful data delivery in spec-
trally harsh environments. (Note that the
SEND
count for a remote radio
is only viewable when the remote is synchronized with its master sta-
tion.)
There are two formats for entering the
SEND
command. One format
(
SEND n
) can be used only at the master station, and selects the base
transmission count for the entire network. The other format (
SEND +n
or
–n
) can be used at any radio in the network, and provides a means to cus-
tomize the transmission count locally at each radio, as a delta (amount
of change) from the base.
For both formats,
n
represents number between 1 and 10; for the “delta”
format a value of zero is also permitted. The net transmission count for
a particular radio is determined by adding the local “delta” (
+n
or
–n
) to
the base transmission count for the network. The net transmission count
is automatically bounded to the range 1..10, irrespective of the delta.
The combination of the two formats provides a means to highly cus-
tomize the retransmission behavior of network.
Higher retransmission counts come at the cost of increased latency and
reduced data throughput. With
BUFF ON
, the radio maintains seamless
operation based on timing derived from the network
SEND
value. The
use of any tailored
SEND
values (e.g.
SEND +/-x
) within the system may
disrupt seamless operation. This is because the increased latency makes
seamless mode impractical. Table 2 lists the maximum cumulative
SEND
count for continuous operation, at some typical data rates.
SETUP
This command sets up the transceiver for checking antenna SWR or
transmitter power with external measuring equipment. Do not use this
mode during normal operation.
Table 9. Baud Rate vs. Maximum SEND Count
BAUD
RATE
(BPS)
XSHORT
(max. send
count)
16 ms
(max. send
count)
20 ms
(max. send
count)
25 ms
(max. send
count)
32 ms
(max. send
count)
SHORT
(max. send
count)
NORMAL
(max. send
count)
LONG
(max. send
count)
1200
3
8
10
10
10
10
10
10
2400
N/A
4
5
5
5
7
8
8
4800
N/A
2
2
2
2
3
4
4
9600
N/A
N/A
N/A
N/A
N/A
N/A
2
2
