Cel-Fi QUATRA

Knowledge Base

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Can a single SISO antenna be used with Cel-Fi QUATRA?

Both the Cel-Fi QUATRA 1000 and 2000 systems use a dual feed (MIMO style) donor antenna, or two SISO antennas may be used if pointed in the same direction.

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Optimization / Health check

Please refer to other training materials for Optimizing your Cel-Fi QUATRA systems.

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Low CU coverage power (isolation)

To achieve full CU TX power, no CU should be closer than 10m to the NU (even between floors), or too close to the donor antenna or signal source, or the gain will auto-reduce to prevent feedback oscillations.

Finding and fixing feedback issues:
All CUs on a system share the same gain, and simple trial and error will help find the offending CU(s). Select any CU on the Systems page and observe the parameter DL Echo Gain on each Radio. If DL Echo Gain is -11 dB or lower, no feedback is occurring. But if DL Echo Gain is -10 or -9 dB on any radio then feedback is being compensated for. Try disconnecting or Disabling each CU, one at a time, to find the offending CU(s) that should be moved to improve isolation. Also remove other cellular solutions that operate on the same channels (no longer needed and may interfere and cause reduced gain).

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Portal LAN Management connection guide

Cel-Fi QUATRA requires an internet connection to the NU for commissioning, and connection/firewall details are described in the Cel-Fi QUATRA Management Connection Guide. Once the system has been commissioned, it will continue to operate without an Internet connection. However the internet connection is necessary for Updates, Notifications, and Remote Management or Troubleshooting without a Site visit.

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Minimum donor antenna spacing

See Guide

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Small Cell Interface usage

When connecting Cel-Fi QUATRA to a Small Cell, please review the Cel-Fi QUATRA Approved Small Cell Guide and follow SCIF (Small Cell Interface) instructions. Improper cabling or signal attenuation can affect performance or cause errors.

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Donor antenna cable spec

Excessive donor antenna system loss can cause a loss of Uplink power and reduced data rates for any relay system. Because Cel-Fi QUATRA is a lossless system, coverage power at the CU will not be effected. However UL transmit power can be reduced by excessive donor antenna coax cabling. To reduce UL data problems, it is best if the LTE RSRP level into each NU Radio is -90 dBm or higher. Using this method, a single donor antenna may be split to feed a number of NUs. NOTE that both donor antenna feeds must be split to feed both RF inputs on the each NU.

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WAVE Portal access to my Quatra

If you have completed the Cel-Fi University on-line courses required for Portal access, log onto the WAVE Portal and make sure you can see the serial numbers of any NU’s you intend to install. Do not wait until the install date or you will not be able to commission systems. They should be visible on the portal Access tab, or you may Request Access using the Options Menu of the Access page. Normally your Cel-Fi QUATRA supplier assigns NU’s to your portal account when you purchase systems.

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Daisy Chaining NU LAN connections

Cel-Fi QUATRA NU’s may be connected to the Site LAN/internet for commissioning and management purposes. For installs with multiple NU’s, each NU LAN port may have its own Ethernet connection, or many NU’s may be “Daisy-Chained” as illustrated below (the number of NU’s may be less depending on Site LAN architecture). If you do not see your NU on the WAVE Portal, reduce the number of Daisy-Chained NU’s, or connect the NU directly to the LAN. Note that NU’s may not be visible on the portal during a background software update.

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