Siemens SIMATIC TIWAY 1 - Manual (Page 78)

THE TIWAY I NETWORK PORTS
UNILINK HOST ADAPTER 4-4
USER MANUAL
30
25
20
15
10
8
5
4
3
2
1
6
7
10 50 100 250
Cable Unit Loading (Number of Stations)
19.2 k bps
38.4 k bps
57.6 k bps
115.2 k bps
115.2 k bps or lower
Belden 9860
Belden 9271
Cable Distance (1000’
s of feet)
20 5
I003648
Figure 4–3 Number of Local Line Secondaries vs.
Cable Distance
Signals are coupled between the transmission line and the transmit/receive
circuits to provide a level of rejection to normal AC power frequency
interference and other noise sources. Information is transferred on the TIWAY I
twisted pair media asynchronously at user selectable data rates of 110, 150, 300,
600, 1200, 2400, 4800, 9600, 19.2K, 38.4K, 57.6K, and 115.2K bits per second, in
half-duplex mode and NRZI encoding. The Local Line interface does not support
synchronous operation or NRZ.