User's Manual

AN-30e
user manual
70-00035-01 Proprietary Redline Communications © 2004 November 2004
Page 18 of 104
3.1 TDM over Wireless
The AN-30e terminal supports simultaneous transport of up to eight full or fractional
rate E1/T1 lines. Optional high speed Ethernet access is also available to operate
concurrently with the TDM transport.
3.1.1 Theory of Operation
TDM transport is achieved through a form of circuit emulation specifically optimized
for wireless operation. The TDM signals are received by the AN-30e at the serial port
interfaces, sampled, and encapsulated within an Ethernet frame structure. The
Ethernet encapsulated traffic is transported over the wireless link to another AN-30e
where the TDM traffic is reconstructed by reversing the encapsulation process and re-
clocking the TDM traffic.
Regular CAS signaling is passed transparently in the TDM traffic, and is not
monitored by the AN-30e system. For fractionalized E1, at least one bundle on each
port must include the signaling channel to support this pass-through feature.
3.1.2 TDM Configuration
TDM signals on the RJ-48/BNC interfaces are sampled and the data is encapsulated
into Ethernet frames. This data is transmitted over the wireless link where the TDM
traffic and clock synchronization are reconstructed.
The TDM signals are transmitted in up to eight separate bundles. Each bundle may
include data from up to 32 consecutive timeslots, allowing full or fractional transport.
Each bundle may be assigned a separate AN-30e system destination address.
Fractional nx64 services allow the user to conserve bandwidth by sending only a sub-
set of channels (time-slots) to transport over the wireless link. The TDM channels can
also be mapped to different timeslots/serial ports at subscriber AN-30e terminals,
performing a cross-connect function over the air.
Figure 3: AN-30e Ethernet/TDM Transport