Trouble Shooting Guide
Table Of Contents
- Troubleshooting-Installing an RF link
- Issue : 5.3.x
- Authors : Matt Olson/Dave Sida
- Date : 30th July 2004
- CONTENTS
- CHANGE HISTORY
- INTRODUCTION
- Aligning an SU
- Fine tuning an SU
- SU signal quality
- Troubleshooting SU link from AP
- Link status
- AP Link Status
- SU Link Status
- MAC type
- Unit MAC address
- Channel
- Radio Channel Mask
- Correlation sequence
- MAC delay compensation
- Unit Range
- Base Station ID
- Radio Temperature
- RSSI
- Path loss in excess of FSL (estimate)
- Downlink RSSI Fade Margin
- TX maximum backoff
- TX current backoff
- Max TX power for channel
- Actual TX power
- Averaging MAC error rates over
- Downlink Header Error Rate
- Downlink Cell Error Rate
- Uplink Cell Error Rate
- Modem RSSI
- Mac stats
- Modem txpower
- Modem mmse
- PNMS Sector
- Survey Scan
- Modem msreg 6 1
- Modem rxdc stats
- Bun list channels
Axxcelera Broadband
Troubleshooting-Installing an RF link - 32 - Issue: 5.3.x
Rev 2
10.1.8 AGC
The AGC Rx pointer is the number of 2dB attenuator pads currently switched into the SU’s receive path.
The AGC Tx pointer is the number of 2dB attenuator pads currently switched into the SU’s transmit path.
10.1.9 Nominal TX chain attenuation
Nominal TX chain attenuation is the amount of attenuation (in terms of 2dB attenuator pads in the radio)
that should be placed in the transmit path to achieve the appropriate TX power, which is derived from the
current received signal strength (RSSI). This value is always twice the value of the AGC Tx pointer.
10.1.10 Actual TX chain attenuation
Actual TX chain attenuation is the amount of attenuation that is actually placed in the transmit path if the
nominal TX chain attenuation is switched in. This uses unique calibration information to calculate the
actual attenuation of each 2dB attenuator pad in the radio. If this number is zero, or very close to it, then
the unit may not be able to transmit at the appropriate power level. This may cause intermittent upstream
and downstream RF problems.
10.1.11 Digital baseband attenuation
The digital baseband attenuation is the amount of attenuation that is placed in the transmit path by the radio
processor. It is used to adjust the radio transmit power very close to, but slightly below, the appropriate
transmit power level.
10.1.12 Nominal (AP) TX power
Nominal (AP) TX power is the power that the AP is supposed to TX at.
Nominal (AP) TX power is the maximum amount of power (dBm) that should be transmitted from the AP
radio, based on FCC regulations, i.e;
FCC High-Band = +14dBm (+14dBm for AB-Extender)
FCC Mid-Band = +8dBm ( +4dBm for AB-Extender)
FCC Low-Band = +1dBm ( -2dBm for AB-Extender)
The nominal (AP) TX power value takes into account deviations from the standard FCC limits for a non-
FCC power scheme, but not for a System Backoff adjustment. It is calculated from information at the SU
only.
10.1.13 Actual (AP) TX power
Actual (AP) TX power is the maximum amount of power (dBm) that should be transmitted from the AP
radio, based on FCC regulations, and any deviations from the standard FCC limits, such as a System
Backoff adjustment or a non-FCC power scheme. This value is an estimate, because the SU cannot
calculate the actual AP transmit power level.
Actual (AP) TX power can therefore be used to see if the SUs and AP in a sector are using the same power
scheme, e.g. a difference between the SU’s actual (AP) TX power, and the AP’s nominal TX power
indicates that the units have been incorrectly configured.