XRT59L921 Datasheet, PDF (7/32 Pages) Exar Corporation – TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT

REV. 1.2.1
PIN DESCRIPTIONS
PIN#
C1
D2
E2
G2
H2
K2
L2
N2
P2
T2
U2
U19
T19
P19
N19
L19
K19
H19
G19
E19
D19
V11
SYMBOL
RRing_0
RRing_1
RRing_2
RRing_3
RRing_4
RRing_5
RRing_6
RRing_7
RRing_8
RRing_9
RRing_10
RRing_11
RRing_12
RRing_13
RRing_14
RRing_15
RRing_16
RRing_17
RRing_18
RRing_19
RRing_20
TxON
XRT59L921
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
TYPE
I
DESCRIPTION
Receiver Negative Bipolar Input – Channel_n:
The Receive Section of Channel_n uses this input pin, along with RTIP_n to receive
the bipolar line signal from the Remote E1 Terminal.
I Transmit ON/OFF Input:
Upon power up, all of the transmitters are powered off. If the TxON pin is pulled
"High" all 21 transmitters are powered on. Individual Channels can be powered
down by connecting TxClk_n "Low" and with TPOS_n/TNEG_n data applied to that
Channel_n.
NOTE: Internally pulled "Low" with a 50kΩ resistor.
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