Mimosa Backhaul B5c User Manual

Mimosa Backhaul Help Content
Mimosa Backhaul Performance
Copyright © 2014 Mimosa Page 28
Link Latency
Product Applicability: B5/B5c, B5-Lite
Link latency is the delay between the time a packet enters the local radio and exits the remote radio in one
direction. In many cases, constraining latency across one link (or more) is a requirement for providing services such
as VoIP that are more sensitive to packet arrival times.
Average link latency is configured with the TDMA Window Size. Available options include 2, 4, and 8 ms. Operators
should take into account the total number of hops when setting TDMA Window Size to ensure that total latency
meets requirements.
In practice, the average latency (in the presence of noise and resulting retries) in one direction is 1.25 * the TDMA
Window Size:
1-Way Latency (ms) = 1.25 * TDMA Window Size (2/4/8 ms)
For example, 2 hops (back-to-back links) with a 4 ms TDMA Window would result in 10 ms average latency (2 hops *
4 ms * 1.25 = 10 ms) in one direction.
Latency tests are usually performed from a command line or embedded interface with the ping command, which
returns the round trip time (RTT) across the link and back. The implication is that ping results will be double of the 1-
Way Latency.
Round Trip Time (ms) = 2.5 * TDMA Window Size (2/4/8 ms)
Note that RF interference, and resulting packet errors (indicated as PER on the Dashboard), can lead to retries and
more round-trips to complete a ping.
Asymmetric TDMA Traffic splits (75/25 or 25/75) have a negligible affect on RTT since the total time always adds up
to one full cycle.

Mimosa Backhaul B5c Specifications

General

Brand	Mimosa
Model	Backhaul B5c
Category	Network Hardware
Language	English

Summary

Setup and Configuration

Default IP Address

Explains the default IP addresses for wired and wireless interfaces.

Reset and Unlock Procedures

Reset B5/B5c and B11

Provides steps to restore B5/B5c and B11 devices to factory state.

Local Device Reset

Details the process for resetting the B5-Lite device to factory state.

Finding the Serial Number

Unlock Process

Details the process for obtaining and applying unlock codes.

Performance Metrics and Tuning

MAC Throughput

Explains MAC throughput and how TDMA settings affect it.

Backhaul Maximum Tx Power

Details maximum transmit power levels for different Mimosa products.

Collocation and Link Setup

TDMA Configuration Settings

Controls for configuring and fine-tuning TDMA performance.

Installation Procedures

Backhaul Installation Overview

PoE Connections

Backhaul Setup and Testing

Setup the First Radio (Access Point)

Guides setup of the first radio as an Access Point.

PTP Mode Operation and Monitoring

Single Client (PTP) Mode Operation

Antenna Aiming Mode

PTMP Mode Operation and Monitoring

Multi Client (PTMP) Mode Operation

Management and Network Configuration

Setting the Management IP Address

Firmware, Reset, and Backup Management

Performing a Firmware Update

Guides on uploading and installing new firmware images.

Reset & Reboot the Device

Provides options to reboot or reset the device to factory settings.

REST API and SNMP Interface

Mimosa REST API

Troubleshooting Guide

Troubleshooting Overview

Categorizes common troubleshooting issues for power, GPS, RF, and throughput.

Ethernet Troubleshooting

Troubleshooting Radio Association

Firmware Updates and Release Notes

B5/B5c Production Firmware

B5-Lite Production Firmware