User guide

Configuring a BH Timing Slave for the
Destination
Configuring for the Destination
364
pmp-0229 (Mar 2013)
In a 5.2- or 5.4-GHz BHS, this parameter displays only ISM frequencies. In a 5.7-GHz BHS, this
parameter displays both ISM and U-NII frequencies. If you select all frequencies that are listed
(default selections), then the module scans for a signal on any channel. If you select only one, then
the module limits the scan to that channel. Since the frequencies that this parameter offers for each
of these two bands are 5 MHz apart, a scan of all channels does not risk establishment of a poor-
quality link as in the 2.4-GHz band. Nevertheless, this can risk establishment of a link to the
wrong BHM.
A list of channels in the band is provided in Considering Frequency Band Alternatives on
Page 134.
(The selection labeled Factory requires a special software key file for implementation.)
Color Code
Specify a value from 0 to 254. For registration to occur, the color code of the BHM and the BHS
must match. The default setting for the color code value is 0. This value matches only the color
code of 0 (not all 255 color codes).
RECOMMENDATION:
Note the color code that you enter. Ensure that you can readily associate this
color code both with the module and with the other data that you store about the
module.
Large VC data Q
Certain applications such as video Surveillance cameras operate by sending bursts of IP traffic
upstream. Some systems will send short bursts of packets at over 50 Mbps and then be idle for
some period of time and then send another burst of data.
In order for the RF interface of a radio to accommodate these bursts of traffic, there is a
configurable parameter on SM radios as well as BH Master and Slave radios to operate with a
large input queue at the radio’s data VC. This large queue allows packets which arrive at a rate
greater than the radio link capacity to be stored in this deep queue until the radio is ready to
transmit them. The queue size has been optimized to allow large packets to be stored just long
enough so that there is always data available to be transmitted, but not large enough to cause
packets to sit in a queue for a second or more.
Configuration of this parameter is shown on the Configuration => Radio web page on the SM,
BHM and BHS. Operators should enable Large VC data Q on the BHM for downlink traffic or
enable it on the BHS for uplink traffic.
If an operator is experiencing packet loss in the uplink due to bursting IP traffic and the
overalltraffic rate is less than or equal to the uplink capacity of the radio system, then the large VC
data Q should be enabled.