XRT59L91ES Exar, XRT59L91ES Datasheet - Page 10

• Manufacturer Part Number: XRT59L91ES
• Description: Peripheral Drivers & Components - PCIs 1 CH E1 AFE
• Manufacturer: Exar

Specifications of XRT59L91ES

• Product Category: Peripheral Drivers & Components - PCIs
• Rohs: yes

Figure 3, indicates that when the user is operating the
XRT59L91 device in the “Clockless” Mode, then the
Terminal Equipment must do the following.
XRT59L91
When applying a pulse (to either the TxPOS or
TxNEG input pin), apply an RZ pulse to the
appropriate input pin. This RZ pulse should only
have a width of one-half the bit-period. Addition,
the RZ pulse should occupy only the first half of
the bit-period. The TxPOS and TxNEG input pins
must be at 0V, during the second half of every bit-
period.
Not apply a signal on the “TxClk” line.
Rev. 1.0.0
Figure 4. Illustration of the ITU-T G.703 Pulse Template for E1 Application
V = 100%
50%
0%
10%
10%
20%
(244 - 25)
(244 + 25)
194ns
269ns
244ns
219ns
10
1.3
The purpose of the “Transmit Pulse Shaping” circuit is
to generate “Transmit Output” pulses that comply with
the ITU-T G.703 Pulse Template Requirements for E1
Applications.
An illustration of the “ITU-T G.703 Pulse Template
Requirements” is presented below in Figure 4.
The Pulse Shaping Circuit
Nominal Pulse