User Manual

AirLink Pro T1/E1 Rack Mount Installer’s Guide
Product Description
Rev. B - 1/97
1-4
Figure 1-2
Typical AirLink Pro T1/E1 Rack Mount Operating Environment
The AirLink Pro T1/E1 Rack Mount link is effectively transparent to the T1/E1
equipment on either end:
❚ Accepts T1/E1 as input
❚ Presents T1/E1 as output
AirLink Pro T1 operation is independent of the protocol used, so the AirLink Pro
T1 supports both the Bipolar with Eight-Zero Substitution (B8ZS) and the
Alternate Mark Inversion (AMI) coding formats. The AirLink Pro E1 supports
both the High Density Bipolar 3 (HDB3, and AMI) coding formats. These
formats do not interfere with the framing and maintenance channel used
between T1/E1 links so the AirLink Pro T1/E1 Rack Mount works with Extended
Frame format, ISDN Primary Rate Services, and so on.
The AirLink Pro T1/E1 Rack Mount provides full-duplex, radio-to-radio
communication that follows a Ping-Pong analogy: while one unit transmits a
radio burst, the other unit receives that burst. After the other unit receives a
complete burst, it waits through a guard interval before turning on its
transmitter and transmitting its burst.
The ping-pong radio-to-radio communication is invisible to the T1/E1
equipment on either end of the link because the digital buffering of the AirLink
Pro T1/E1 Rack Mount produces a smooth T1/E1 bit stream at the user interface.