Installation guide

33
Cisco uBR7200 Series Universal Broadband Router Wireless Modem Card and Subsystem Installation and Configuration
78-6030-03
Configuring a Wireless Modem Card
If you are using two antennas and problems occur with the dual antenna command, reissue the command
specifying loopback local if main or loopback local if diversity to help isolate the problem.
It may also be helpful to run a power-on self test (POST). The POST can be configured to run either once
or every time the link is initiated. The following commands configure a self-test to run when the first
no shut command is entered.
UBR1(config-if)# shut
UBR1(config-if)# radio self-test
UBR1(config-if)# no shut
If the POST fails, the wireless modem card may be faulty.
RF Loopback
An RF loopback (see Figure 29) confirms that the wiring to the transverter is correct, communication
has been established, and the transverter appears to be operating correctly. (It does not test the duplexer,
which is the final stage before the signal is sent to the antenna.) Because there is only one transmit path,
the path to each transverter must be tested separately. Use the following commands:
UBR1(config-if)# shut
UBR1(config-if)# loopback local rf main
UBR1(config-if)# no shut
A loopback to the main transverter should start and the Carrier and Out of Service LEDs on the wireless
modem card should light. If the loopback does not start (and the Carrier and Out of Service LEDs do not
light), examine the data cable, the control cable, and the power supply for faults.
UBR1(config-if)# shut
UBR1(config-if)# loopback local rf diversity
UBR1(config-if)# no shut
A loopback to the diversity transverter should be initiated. If it does not start, examine the data cable,
the control cable, and the power supply for faults.
If neither transverter operates properly, it is likely that there is a cabling, power-supply, or configuration
problem. If one transverter fails, but the other transverter does not, try swapping the data and control
cables to isolate the problem to either the transverter or the cables.
Be sure to remove any loopback commands used up to this point by entering the no loopback command.
RF-to-RF Link (Over the Air)
When both ends of the link have successfully performed RF loopbacks, the RF-to-RF link can be
established. The following example represents the minimal configuration required to send a ping
command over the radio link. Refer to other Cisco uBR7200 series documentation for information about
specific traffic types.
This section gives an example of an RF-to-RF link operating at 6 MHz/high with the parameters
specified in Figure 30. This example assumes that the IF cable-loss for uBR1 and uBR2 were determined
to be 5 dB and 10 dB, respectively.