# Remote Statistics

## General Settings

### Packet Error Rate (PER)

Select how to calculate the PER.

All Packets (Infinite):The packet error rate is calculated since power cycle or since the last "Clear Stats" event. PER=((total bad packets)/(total bad packets + total good packets))*100

Recent Packets: The packet error rate is based on the last several hundred packets only. This mode represents the current link quality more accurately than the Infinite mode which calculates PER based on all packets transmitted or received since the last power cycle or "Clear Stats" event."

### Duplicate Packet Removal

This option must be enabled in order to calculate the PER. It controls if the packets sent over the air will contain or not the packet sequence number (used by duplicate packet detection and PER calculation). By default it is disabled to preserve compatibility with firmware versions prior to V3.3_R201109191700. If this option is enabled facing the older firmware versions (prior to V3.3_R201109191700), the RF communication will fail.

## Remote Viper Table

This table contains statistics about remote units that we detected on the RF interface. The table is updated dynamically when packets are received and transmitted by the unit. The unit receives packets from units that are not talking to it directly, in this case you will see entries with the RX and TX packet count set to 0. If you have a remote unit that you don't see in this table, it may be because it did not transmit or receive anything yet over the air.

### Remote Unit

The RF MAC address of a neighboring remote unit. This table is updated every time the Viper sends (or receives) data to (or from) that unit. If the RF MAC address is prefixed with the following character '*', it means that we learned about this unit through a Relay Point (RP) unit.

### RF IP Address

RF IP Address of the remote unit. The RF IP address may not be known, in that case a question mark '?' is displayed (the RF MAC address of the unit is used to find the RF IP address in the neighbor table).

### Received Packets

The number of IP packets sent by the remote unit to this unit.

A packet is bad (failed) if at least one of the CRC, the length, or the system identifier is incorrect, or it is simply missing in action (not received at all by this unit). The Viper is able to detect missing packets because of the sequence number in each packets.

The receive Packet Error Rate (PER).

When the packet error rate indicates "?", it's because the unit cannot determine the value. This is because the sequence number is not included in the packets received over the air or that no IP packet was received yet. To make sure that a remote unit includes the sequence number in is packets, the "OIP duplicate packet removal" feature must be enabled on it.

### Transmitted Packets

The number of IP packets transmitted on the RF interface (good and bad packets) to the remote unit (unicast or broadcast).

A packet is bad (failed) if we did not receive a notification from the remote unit of the arrival of the packet.

The transmit Packet Error Rate (PER).

When the packet error rate indicates "?", it's because the unit cannot determine the value. This is because the RF ACK" feature is not enabled on this unit or no IP packet was yet transmitted. The "RF ACK" feature lets the unit know that the packet made it through to the remote unit.

### RSSI

The last Received Signal Strength Indicator (RSSI) from the given remote unit. Each time a new packet is received from the remote unit, the RSSI in this table is calculated and updated.

### SNR

The last Signal to Noise Ratio (SNR) from the given remote unit. Each time a new packet is received from the remote unit, the SNR in this table is calculated and updated.

Back to Top