XRT5997 Datasheet, PDF (22/37 Pages) Exar Corporation – Seven-Channel E1 Line Interface Unit

XRT5997
V = 100%
269ns
(244 + 25)
194ns
50%
10%
0%
10%
244ns
219ns
(244 - 25)
20%
Nominal Pulse
Figure 4. Illustration of the ITU-T G.703 Pulse Template for E1 Applications
As a consequence, each channel (within the XRT5997
device) will take each mark (which is provided to it via
the “Transmit Input Interface” block, and will generate
a pulse that complies with the pulse template, pre-
sented in Figure 4, (when measured on the secondary-
side of the Transmit Output Transformer).
1.4 Interfacing the Transmit Sections of the
XRT5997 device to the Line
ITU-T G.703 specifies that the E1 line signal can be
transmitted over coaxial cable and terminated with 75Ω
or transmitted over twisted-pair and terminated with
120Ω.
However, in both applications (e.g., 75Ω or 120Ω), the
user is advised to interface the Transmitter to the Line,
in the manner as depicted in Figures 5 and 6, respec-
tively.
Rev. 1.0.0
22