Tdm Over Wireless Theory Of Operation - Redline AN-30 System User Manual

AN-30 System User Manual
The AN-30 can be equipped with a narrow beam antenna to provide high directivity for
long-range operations up to 30 miles (50 km) under line of sight (LOS) conditions, and
up to 6.2 miles (10 km) under non line of sight (NLOS) conditions.
The AN-30 system is a Class A digital device for use in a commercial, industrial or
business environment.
1.3.

TDM over Wireless Theory of Operation

TDM transport is achieved through a form of circuit emulation, which has been
specifically optimized for wireless operation.
TDM traffic, digitized voice or chanelized data, is received by the AN-30 at the RJ48 /
BNC interfaces, interpreted and encapsulated within an Ethernet frame structure. The
Ethernet encapsulated traffic is then transported over the wireless link to a remote end
AN-30, where the TDM traffic is reconstructed by reversing the encapsulation process
and re-clocking the TDM traffic.
Variable delay is commonly associated with packet based networks and can be
introduced by the AN-30 during packet processing and transmision of simultaneous TDM
and data traffic streams. In order to insure proper timing of the reconstructed traffic, the
remote AN-30 employs a jitter buffer that is user defined between 5 and 300 msec. The
jitter buffer is used to compensate for any delay variation that may occur during transport
of the ethernet encapsulated traffic. For time sensitive applications, such as TDM voice,
the buffer is typically set below 10 msec, while more data centric applications would
employ a buffer that is closer to 300 msec to maximize packet efficiency.
Fractional nx64 services are also supported by allowing the user to specify which
timeslot chanels to transport over the wireless link. Timeslots can be set from 1 to 24 for
T1 and from 1 to 32 for E1.
The AN-30 supports IEEE 802.1p, 802.1Q and 802.3x. Using these standards for VLAN
tagging prioritization and flow control the AN-30 is able to maintain the necessary QoS
guarantees for TDM traffic while simultaneously transporting data applications using the
excess bandwidth.
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