Nstreme Version 2 (Nv2); What Is Nv2; Nv2 Compatibitily - WiBorne WAP Series Quick User Manual

Nstreme Version 2 (Nv2)

• What is Nv2

• Nv2 Compatibility
• Nv2 co-existence
• Nv2 vs 802.11 vs Nstreme
• Nstreme / NV2 Rates
What is Nv2
• Proprietary protocol for use with Atheros 802.11 wireless chips. It uses TDMA (Time
Division Multiple Access) as the MAC level data carrier
• It replaces and is not compatible with CSMA/CA (Carrier Sense Multiple Access) and
Nstreme
• TDMA solves hidden node problem and improves media usage, thus improving
throughput and latency, especially in PtMP networks.
• Nv2 is supported for Atheros 802.11n chips and legacy 802.11a/b/g chips starting
from AR5212, but not supported on older AR5211 and AR5210 chips. Both 11n and
legacy devices can participate in the same network and a hardware upgrade is not
required to implement Nv2
• NV2 deploys multiple timeslots per transmission cycle that are assigned to clients at
the beginning of each transmission
• Each client may only transmit in his own timeslot
• Strict timeslot control ensures each client has a fair chance of transmitting or
receiving data
• Media access in a Nv2 network is controlled by the Nv2 Access Point.
• The AP divides time into fixed size "periods" which are dynamically divided in the
downlink (data sent from AP to clients) and uplink (data sent from clients to AP)
portions, based on queue state on AP and clients.
• Uplink time is further divided between connected clients based on their requirements
for bandwidth.
• At the beginning of each period the AP broadcasts a schedule that tells clients when
they may transmit and the amount of time they can use.

Nv2 Compatibitily

• Nv2 protocol is not compatible with any other wireless protocols or implementations,
either TDMA based or any other kind, including Motorola Canopy, Ubiquiti Airmax
and FreeBSD TDMA implementation. Only Nv2 supported and enabled devices can
participate in a Nv2 network.
• Regular 802.11 devices will not recognize and will not be able to connect to an Nv2
AP.
• WAP/CAP devices that have Nv2 support will see Nv2 APs when running a wireless
scan, but will only connect to a Nv2 AP if properly configured.
393