User`s manual

APPENDIX C
TABLES/DIAGRAMS
APX C-1
EFFECTIVE BAUD RATE TABLE
:# of Repeaters None One Two Three
1010 4398 2191 1455 1088
504 4056 2016 1333 994
Pack- 250 3503 1735 1140 846
length 100 2492 1225 797 587
(Bytes) 50 1688 821 531 389
25 1020 496 318 232
151251611
NOTE:
These times are used for "BLOCK TRANSFER"
applications and assumes the RS-232C Input/Output
Baud Rate is 9600 for all devices used and the radio
transfer rate is the factory default setting of 4800
b/s. These calculations are accurate for binary
transfer applications; actual times for ASCII files will
be slightly higher.
TOTAL PACKET OVERHEAD (POH)
No repeater : POH = 84 ms.
One repeater : POH = 87 ms.
Two repeaters : POH = 91 ms.
Three repeaters : POH = 94 ms.
CALCULATING TOTAL
TRANSMISSION TIME (TTT)
TTT = [ 2(n+1) * POH ] + [ (n+1) * (Data/4800) ]
n = Number of Repeaters.
Data = Total number of Data Bits transmitted per packet or frame.
EFFECTIVE BAUD RATE
EBR = Data/TTT = BAUD RATE (when using a 8 bit word).
ESTEEM TIMING DIAGRAM
TXDATA
DELAY
TXFLAY
DELAY
PACKET
Over- head
DATA TXEND
DELAY
CARBSY
DELAY
Data Packet from Sending Modem
TXDATA
DELAY
TXFLAG
DELAY
PACKET
Over- head
TXEND
DELAY
CARBSY
DELAY
Acknowledge Packet from Receiving Modem
NOTE:
Data field can vary from 1 to 1010 byes (8 to 8080 bits)
depending on setup.
Listed below are the factory preset delay times for the following
modems for comparison (no repeaters).
MODEL 85/96
TICKS TIME
TXDATA 35 35 ms.
TXFLAG 4 4 ms.
PACKET OH 18 ms.
TXEND 10 10 ms.
CARBSY 1 17 ms.
TOTAL PACKET OVERHEAD 84 ms.
TOTAL PACKET TURN AROUND TIME
(No Repeaters)
O.H. Transmitted Data ACK Frame
NOTES:
The factory settings for Models 85 and 86 have been
optimized for the transmitter and should not be changed.