Installation guide

Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.1 T

78-10643-04 Rev. B0

Caveats

Open Caveats for Wireless Modem Card Functionality for Release 12.1(1a)T1

This section describes possibly unexpected behavior by the point-to-point wireless modem card and

wireless subsystem in Cisco IOS Release 12.1(1a)T1, which is the first release that supports the

point-to-point wireless modem card.

• CSCdm55663

When the point-to-point wireless modem card is configured for maximum IF cable loss, the

receiver’s sensitivity may be reduced by 1.5 to 2 dB.

• CSCdm56880

Under very infrequent conditions, the point-to-point wireless modem card establishes a link of

marginal quality, taking longer than normal to synchronize. However, the link does resynchronize

correctly after several seconds, with no further impact on signal stability.

• CSCdm81104

The temperature of a wireless transverter cannot be read on demand—the temperature is not

accurately displayed when the Cisco uBR7200 series router is queried using SNMP requests. In

addition, the temperature of a transverter is reported to the console only when the factory set

threshold is crossed. There is no workaround to read the transverter’s temperature on demand.

• CSCdp08266

The point-to-point wireless modem card does not currently calculate or display received signal

strength. The workaround is to use the following procedure to calculate an estimate for the received

signal strength.

a. Measure the total AGC attenuation of the system with the radio histogram totalGain <n> 12

50 coll 10 per 10 sum true command, where <n> is the antenna number (1 or 2).

b. Find the average total gain value in the displayed histogram data.

c. Determine the currently configured cable loss for the radio interface by giving the show run

command and finding the radio cableloss command for that radio interface.

d. Calculate the estimated received signal strength (in dBm) with the following calculation:

estimated received signal strength = ((average total gain) / 2) – 96 dBm

• CSCdp12605

When two wireless transverters are powered by a single DC power supply, applying or removing

power to one transverter can create transients on the DC line. Depending on the regulation of the

DC supply, these transients could affect the operation of the second transverter until DC power

restabilizes—in extreme situations, this could result in the resetting of the second transverter. The

workaround is to use a separate DC power supply for each transverter.

• CSCdp27784

The radio snapshot command allows up to four simultaneous snapshots, except when collecting

rx-timedomainchannel snapshot types. Time domain snapshots for either antenna must be

collected one at a time.