CBF Networks Inc. dba Fastback Networks 105 User Manual
IBR Installation Guide
Page 33 of 38
Doc # 770-00023.1
Jan. 23, 2015
If any of these values is outside the required operating range, it might be necessary to reposition (i.e., rotate,
elevate, or move) one or both IBRs, or to swap ends of the link.
elevate, or move) one or both IBRs, or to swap ends of the link.
2.6.
Reposition IBR
It might be necessary to perform one or more of the following procedures for either or both IBRs. Which
repositioning strategy should be tried first will be a decision the field engineer will need to make based on
repositioning strategy should be tried first will be a decision the field engineer will need to make based on
observations at the mounting locations.
In all cases, be mindful of cable lengths and tie-downs, and power connections.
CAUTION: WHEN POWER IS APPLIED TO IBR, IBR AUTOMATICALLY WILL BEGIN TRANSMITTING. DO NOT
TRY TO REPOSITION IBR WHEN POWER IS CONNECTED.
TRY TO REPOSITION IBR WHEN POWER IS CONNECTED.
2.7.
Rotate IBR
IBR can be rotated to point more closely in the direction of the other IBR or toward some object that might
provide reflection of the signals. The objective is to improve received signals at both ends of the link.
provide reflection of the signals. The objective is to improve received signals at both ends of the link.
1) Loosen the mounting bracket.
2) Rotate the IBR to the desired alignment position.
3) Retighten the mounting bracket.
4) Check the radio status to verify signal level improvement.
IBR101 # show interface radio 0 status
5) Repeat until the signal level improves and a link is established.
2.8.
Elevate IBR
If IBR is mounted on a pole or mast, it might be possible to move it up without removing IBR from its
mounting bracket. If IBR is mounted on a wall, it will be necessary to remove IBR from the bracket and move
the wall-mount portion of the bracket to a higher location.
mounting bracket. If IBR is mounted on a wall, it will be necessary to remove IBR from the bracket and move
the wall-mount portion of the bracket to a higher location.
Elevating IBR only a foot or two can make a significant improvement in reception.
2.9.
Change Location
Often a more suitable location near the current location can be selected to reduce interference from physical
(non-radiating) objects, and/or from sources of RF radiations (e.g., other radios) that are operating in the
area. A new location on the same rooftop or even on the same mounting asset often can improve reception
signal levels.
area. A new location on the same rooftop or even on the same mounting asset often can improve reception
signal levels.
2.10.
Reposition Each IBR to the Other End of the Link
Because the two IBRs receive in different frequency bands, swapping ends of the link can improve link
performance when one of the radios is operating near another radio that is transmitting near to the IBR’s
receive band. This is also often the easiest solution since the existing mounts and connections can be utilized
performance when one of the radios is operating near another radio that is transmitting near to the IBR’s
receive band. This is also often the easiest solution since the existing mounts and connections can be utilized
and only the IBRs need to be moved.
A 3.
Packet Flood or Storm Condition
If an IBR pair with a default configuration establishes a wireless link and the connecting Ethernet interfaces
are connected to the same layer 2 network, a loop will be formed and a broadcast storm will occur. When this
happens, the network interfaces will become inaccessible, and the IBR CLI will become slow to respond. All
are connected to the same layer 2 network, a loop will be formed and a broadcast storm will occur. When this
happens, the network interfaces will become inaccessible, and the IBR CLI will become slow to respond. All
other devices on the collision domain will be inaccessible.