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Installing Hardware for the G150 Media Gateway
The G150 wireless network can be secured against intruders using either the Wired Equivalent
Privacy (WEP) or RC4. WEP uses 64 bit encryption key and RC4 uses a 128 bit encryption key.
Only devices with a matching security key can participate in the network. G150 complies to the
IEEE 802.11 and IEEE 802.11b standards meeting the Wireless Ethernet Compatibility Alliance
(WECA) Wireless Fidelity Wi-Fi™ requirements for interoperability.
Table 4: G150 WiFi Range Specifications
RANGE
(METERS/FT)
Open
Semi-open
Closed
Receiver
Sensitivity dBm
Delay Spread
(at FER of
<1%)
Quality of Service (QoS)
The G150 supports two IP routing queues on each of its WAN ports (Ethernet WAN on the front
panel and the optional WAN interface on the back panel). One routing queue is dedicated to
Voice Traffic, the second to any other data. Voice traffic and signaling can be independently
marked using Differentiated Services. This ensures that calls in-progress take priority over call
signaling and other traffic on slow bandwidth links. When operating over Frame Relay, G150 will
mark non-voice traffic that exceeds the committed information rate as discard to ensure voice
receives priority. Traffic that is being sent over a G150 Ethernet interface is DiffServ marked, but
treated as a single queue.
Silence suppression allows the best use of available bandwidth. Silence suppression works by
sending descriptions of the background noise, rather than the actual noise itself, during gaps in
conversation, thereby reducing the packet size needed.
Large packets traveling over low bandwidth links such as Frame Relay or PPP connections are
also fragmented to allow voice packet to be interleaved.
Supported QoS related standards
Silence Suppression
Frame Relay Discard Eligibility
Local End Echo Cancellation 25ms
Out-of-band DTMF
32 Installation and Configuration of the G150 Media Gateway
11 MBIT/S
5.5 MBIT/S
160m (525 ft)
270m (885 ft)
50m (165 ft)
70m (230 ft)
25m (80 ft)
35m (115 ft)
-82
-87
65ns
225ns
2 MBIT/S
1 MBIT/S
400m (1300 ft)
550m (1750 ft)
90m (300 ft)
115m (375 ft)
40m (130 ft)
50m (165 ft)
-91
-94
400ns
500ns
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