XRT73L03 Datasheet, PDF (14/62 Pages) Exar Corporation – 3 CHANNEL E3/DS3/STS-1 LINE INTERFCE UNIT

XRT73L03 3 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
REV. P1.0.13
áç
PRELIMINARY
PIN DESCRIPTION
PIN #
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
SIGNAL NAME
RLB1
RxAVDD1
RRing1
RTIP1
RxAGND1
REQEN1
LOSTHR3
LLB3
RLB3
RxAVDD3
RRing3
RTIP3
RxAGND3
REQEN2
RxAGND2
RTIP2
TYPE
I
****
I
I
****
I
I
I
I
****
I
I
****
I
****
I
DESCRIPTION
Remote Loop-back - Channel 1:
This input pin along with LLB1 dictates the Loop-Back mode in which Channel
1 in the XRT73L03 is operating.
A "High" on this pin with LLB1 being set to “Low" configures Channel 1 of the
XRT73L03 to operate in the Remote Loop-back Mode.
A "High" on this pin with LLB1 also being set to "High" configures Channel 1 of
the XRT73L03 to operate in the Digital Local Loop-back Mode.
NOTE: This input pin is ignored and should be connected to GND if the
XRT73L03 is operating in the HOST Mode.
Receive Analog 3.3V+ 5% VDD - Channel 1
Receive Ring Input - Channel 1:
This input pin along with RTIP1 is used to receive the bipolar line signal from
the Remote DS3/E3 Terminal.
Receive TIP Input - Channel 1:
This input pin along with RRing1 is used to receive the bipolar line signal from
the Remote DS3/E3/STS-1 Terminal.
Receive Analog GND - Channel 1
Receive Equalization Enable Input - Channel 1:
Setting this input pin "High" enables the Internal Receive Equalizer of Channel
1. Setting this pin "Low" disables the Internal Receive Equalizer. The guide-
lines for enabling and disabling the Receive Equalizer are described in Section
3.2.
NOTE: This input pin is ignored and should be connected to GND if the
XRT73L03 is operating in the HOST Mode.
Loss of Signal Threshold Control - Channel 3:
Refer to the description of pin 67, LOSTHR1
Local Loop-back - Channel 3:
Refer to the description of pin 68, LLB1
Remote Loop-back - Channel 3:
Refer to the description of pin 69, RLB1
Receive Analog 3.3V+ 5% VDD - Channel 3
Receive Ring Input - Channel 3:
Refer to the description of pin 71, RRing1
Receive TIP Input - Channel 3:
Refer to the description of pin 72, RTIP1
Receive Analog GND - Channel 3
Receive Equalization Enable Input - Channel 2:
Refer to the description of pin 74, REQEN1
Receive Analog GND - Channel 2
Receive TIP Input - Channel 2:
Refer to the description of pin 72, RTIP 1
11