XRT5997 Datasheet, PDF (10/37 Pages) Exar Corporation – Seven-Channel E1 Line Interface Unit

XRT5997
PIN DESCRIPTION (CONT'D)
Pin#
Symbol
Type
48
LOS4
O
49
TxPOS4
O
50
TxNEG4
I
51
TxClk4
I
52
RRing4
I
Description
Receiver 4 Loss of Signal:
This output pin toggles “high” if Channel 4, within the XRT5997 device has
detected a “Loss of Signal” condition in the incoming line signal.
Transmitter - Positive Data Input – Channel 4:
The exact signal that should be applied to this input pin depends upon
whether the user intends to operate the “Transmit Section” (of Channel 4) in
the “Clocked” or “Clockless” Mode.
Clocked Mode:
The Terminal Equipment should apply bit-wide NRZ pulses on this input pin,
whenever the Terminal Equipment needs to transmit a “positive-polarity”
pulse onto the line via TTIP4 and TRing4 output pins). The XRT5997
device will sample this input pin upon the falling edge of the TClk4 signal.
Clockless Mode:
The Terminal Equipment should apply RZ pulses to this input pin, anytime
the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the
line via TTIP4 and TRing4 output pins.
Transmitter - Negative Data Input – Channel 4:
The exact signal that should be applied to this input pin depends upon
whether the user intends to operate the “Transmit Section” (of the Channel 4)
in the “Clocked” or “Clockless” Mode.
In the Clocked Mode:
The Terminal Equipment should apply bit-wide NRZ pulses on this input pin,
whenever the Terminal Equipment needs to transmit a “negative-polarity”
pulse onto the line via the TTIP4 and TRing4 output pins. The XRT5997
device will sample this input pin upon the falling edge of the TClk4 signal.
In the Clockless Mode:
The Terminal Equipment should apply RZ pulses to this input pin, anytime the
Terminal Equipment needs to transmit a “negative-polarity” pulse onto the
line (via the TTIP4 and TRing4 output pins).
Transmitter Clock Input – Channel 4:
If the user operates Channel 4 (within the XRT5997 device) in the “clocked”
mode, then the “Transmit Section” of the Channel 4 will use the falling edge of
this signal to sample the data at the TxPOS4 and TxNEG4 input pins.
Note: If the user operates the Channel 4 in the “clockless” mode, then the
Terminal Equipment should not apply a clock signal to this input pin.
Receiver 4 Negative Bipolar Input:
The Receive Section of Channel 4 uses this input pin, along with RTIP4 to
receive the bipolar line signal from the “Remote E1 Terminal”.
Rev. 1.0.0
10