Baseline Systems FreeWave Ethernet Radio - Manual (Page 20)

FGR2-PE Wirelss Data Transceiver
LUM0024AB Rev A
to the Gateway. In a MultiPoint network, you determine the set number of times outbound packets from the
Gateway or Repeater to Endpoints or other Repeaters are sent. The receiving transceiver, Endpoint or
Repeater, accepts the first packet received that passes the 32 bit CRC. However, the packet is not
acknowledged. On the return trip to the Gateway, all packets sent are acknowledged or retransmitted until
they are acknowledged. Therefore, the return link in a MultiPoint network is generally very robust.
Traditionally, a MultiPoint network is used in applications where data is collected from many instruments and
reported back to one central site. As such, the architecture of such a network is different from Point-to-Point
applications. The following parameters influence the number of transceivers that can exist in a MultiPoint
network:
1. Size of the blocks of data. The longer the data blocks, the fewer number of deployed Endpoints
can exist in the network.
2. Baud rate. The data rate between the transceiver and the device to which it is connected could
limit the amount of data and the number of transceivers that can exist in a network
3. The amount of contention between SlavesEndpoints. Polled Endpoints vs. timed
SlavesEndpoints.
4. Use of Repeaters. Using the Repeater setting in a MultiPoint network decreases overall network
capacity by 50%.
For example, if the network polls Endpoints once a day to retrieve sparse data, several hundred Endpoints
could be configured to a single Gateway. However, if each Endpoint transmits larger amounts of data or data
more frequently, then fewer Endpoints can link to the Gateway while receiving the same network
performance. When larger amounts of data are sent more frequently, the overall network bandwidth is closer
to capacity with fewer Endpoints.
For examples and additional information about data communication links, see the Examples of Data
Communication Links section later in this document.
Point-to-Point Operation LEDs
Gateway Endpoint Repeater
Condition
Carrier
Detect
(CD)
Transmit
(Tx)
Clear to
Send
(CTS)
Carrier
Detect
(CD)
Transmit
(Tx)
Clear to
Send
(CTS)
Carrier
Detect
(CD)
Transmit
(Tx)
Clear to
Send
(CTS)
Powered, no link Solid red
bright
Solid red
bright
Solid red
bright
Solid red
bright
Off Blinking
red
Solid red
bright
Off Blinking
red
Linked, no Repeater,
sending sparse data Solid
green
Intermittent
flash red
Intermittent
flash red
Solid
green
Intermittent
flash red
Intermittent
flash red
n/a n/a n/a
Gateway calling End-
point through
Repeater Solid red
bright
Solid red
dim
Solid red
bright
Solid red
bright
Off Blinking
red
Solid red
bright
Off Blinking
red
MasterGateway
linked to Repeater,
not to Endpoint Flashing
orange
Solid red
dim
Solid red
bright
Solid red
bright
Off Blinking
red
Solid Red
bright
Solid red
dim
Solid red
bright
Repeater linked to
Endpoint Solid
green
Intermittent
flash red
Intermittent
flash red
Solid
green
Intermittent
flash red
Intermittent
flash red
Solid
green
Intermittent
flash red
Intermittent
flash red
Mode 6 - waiting for
ATD command Solid red
bright
Off Blinking
red
Solid red
bright
Off Blinking
red
n/a n/a n/a
Setup Mode Solid
green
Solid
green
Solid
green
Solid
green
Solid
green
Solid
green
Solid
green
Solid
green
Solid
green
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