GE MDS entraNET 900 Technical Manual page 171

05-4055A01, Rev. E
• The number of bytes they can fit into a hop, depending on hop
time, is:
Included in the byte count is 9 bytes of overhead per packet. So,
at 7 ms without FEC, a 1000 byte packet requires 1009 bytes
split into 45 bytes/hop, or 23 hops. 1026 bytes of data also
requires 23 hops; however, a 1027-byte data packet requires 24
hops.
• If any transceiver in your network is connected to a large LAN,
such as may be found in a large office complex, there might be
undesired multicast or broadcast traffic over the air.
3. Station-to-Station Traffic
• When sending frames from one remote endpoint to another
remote endpoint using an AP transceiver (see
throughput is halved at best. This is because all frames must go
through the AP. Therefore, in the previous 100 byte UDP
example, the number of over-the-air bytes is 380 bytes
(190 bytes times 2) if the frame must go station to station.
Figure 6-7. Endpoint-to-Endpoint Communication Using an AP
4. Interference has a direct correlation to throughput:
• Interference could be caused by any unnecessary traffic on the
network from unrelated activities, or radio interference.
MDS entraNET Technical Manual
Table 6-1. Number of bytes per hop
Hop time
(MS) FEC
7
7 FEC
14
14 FEC
28
28 FEC
Invisible place holder
Bytes/hop
45
11
139
59
324
151
Figure 6-7),
161