XRT73R12_07 Datasheet, PDF (11/89 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

REV. 1.0.2
XRT73R12
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
RECEIVE LINE SIDE PINS
PIN #
SIGNAL NAME
TYPE
B22
RTip0
I
AE22
RTip1
B18
RTip2
AE18
RTip3
A14
RTip4
AF14
RTip5
D13
RTip6
AC13
RTip7
B9
RTip8
AE9
RTip9
B5
RTip10
AE5
RTip11
C22
RRing0
I
AD22
RRing1
C18
RRing2
AD18
RRing3
B14
RRing4
AE14
RRing5
C13
RRing6
AD13
RRing7
C9
RRing8
AD9
RRing9
C5
RRing10
AD5
RRing11
DESCRIPTION
Receive TIP Input
These input pins along with the corresponding RRing_n input pin function as the
Receive DS3/E3/STS-1 Line input signal for a given channel of the XRT73R12.
Cconnect this signal and the corresponding RRING_n input signal to a 1:1
transformer.
Whenever the RTIP/RRING input pins are receiving a positive-polarity pulse
within the incoming DS3, E3 or STS-1 line signal, this input pin will be pulsed to
a higher voltage than its corresponding RRING_n input pin.
Conversely, whenever the RTIP/RRING input pins are receiving a negative-
polarity pulse within the incoming DS3, E3 or STS-1 line signal, this input pin
will be pulsed to a lower voltage than its corresponding RRING_n input pin.
Receive Ring Input
These input pins along with the corresponding RTIP_n input pin function as the
Receive DS3/E3/STS-1 Line input signal for a given channel of the XRT73R12.
Connect this signal and the corresponding RTIP_n input signal to a 1:1 trans-
former. (See Figure 6)
Whenever the RTIP/RRING input pins are receiving a positive-polarity pulse
within the incoming DS3, E3 or STS-1 line signal, then this input pin will be
pulsed to a lower voltage than its corresponding RTIP_n input pin.
Conversely, whenever the RTIP/RRING input pins are receiving a negative-
polarity pulse within the incoming DS3, E3 or STS-1 line signal, then this input
pin will be pulsed to a higher voltage than its corresponding RTIP_n input pin.
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