最後更新: 2016-07-05

介紹

Model: SXT-G-2HnD

HW info.

 * 802.11b/g/n dual chain
 * polarization 10 dBi    antenna
 * Gigabit Ethernet connector
 * 24V Passive PoE (accepts powering from ethernet port 8-30V)

Reset Button:

[1] reset configureation
Hold until LED light starts flashing then release the button

[2] look for Netintall servers
Hold this button until LED turns off then release it

Default Login:

host: 192.168.88.1
user: admin
pass: no pw

Nv2 (proprietary wireless protocol)

* Use with Atheros 802.11 wireless chips

Based on TDMA(Time Division Multiple Access) technology (TDMA is a channel access method for shared medium networks.)

It allows several users to share the same frequency channel by dividing the signal into different time slots.

Nv2 AP divides time in fixed size "periods" which are dynamically divided in 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 begginning of each period AP broadcasts schedule that tells clients when they should transmit and the amount of time they can use.

In order to allow new clients to connect, Nv2 AP periodically assigns uplink time for "unspecified" client - this time interval is then used by fresh client to initiate registration to AP. Then AP estimates propagation delay between AP and client and starts periodically scheduling uplink time for this client in order to complete registration and receive data from client.

As Nv2 does not use CSMA technology it may disturb any other network in the same channel. In the same way other networks may disturb Nv2 network, because every other signal is considered noise.

好處

 * Media access is scheduled by AP

 * Reduced propagation delay overhead ( no per-frame ACKs in Nv2 )

 * Reduced per frame overhead (interframe spaces, preambles)