XRT59L921IB Exar Corporation, XRT59L921IB Datasheet - Page 20

• Manufacturer Part Number: XRT59L921IB
• Description: 21 CHANNEL E1 LIU
• Manufacturer: Exar Corporation

Specifications of XRT59L921IB

• Lead Free Status / RoHS Status: Contains lead / RoHS Compliant

XRT59L921
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
Each channel (within the XRT59L921) 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, presented in
measured on the secondary-side of the Transmit Output Transformer).
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
respectively.
F
1.4
IGURE
6. I
Interfacing the Transmit Sections of the XRT59L921 to the Line
LLUSTRATION OF THE
V = 100%
50%
0%
ITU-T G.703 P
Note – V corresponds to the nominal peak value.
ULSE
(244 – 25)
(244 + 244)
T
(244 + 25)
(244 – 50)
EMPLATE FOR
18
269 ns
194 ns
219 ns
244 ns
488 ns
E1 A
PPLICATIONS
No m ina l pulse
Figure 7
Figure
and
REV. 1.2.1
Figure
6, (when
8,