XR-T5793
5
Rev. 2.00
PIN DESCRIPTION (CONT’D)
PLCC
Pin #
SQFP
Pin #
Symbol
Type
Description
27
21
LPMOD4
I
Loop Mode 4. If driven high the loopback mode of channel 4 will be set to re-
mote loop. Otherwise theloopback mode will remain at local loop. The
actualloopback will be activated when the LOOPEN4 is asserted.
28
22
LPMOD3
I
Loop Mode 3. If driven high the loopback mode of channel 3 will be set to re-
mote loop. Otherwise the loopback mode will remain at local loop. The
actual loopback will be activated when the LOOPEN3 is asserted.
29
23
RXIN4
I
Receiver 4 Input. Receiver 4 bipolar input connected to coupling capacitor or
pulse transformer.
30
24
LOS4
O
Receiver 4 Loss of Signal. Asserted during LOS condition. Clear otherwise.
31
25
LOS3
O
Receiver 3 Loss of Signal. Asserted during LOS condition. Clear otherwise.
32
26
RXIN3
I
Receiver 3 Input. Receiver 3 bipolar input connected to coupling capacitor or
pulse transformer.
33
27
NC
No Connect.
34
28
NC
No Connect.
35
29, 30
RGND
GND
Receive Ground.
36
31
RGND
GND
Receive Ground.
37
32
NC
No Connect.
38
33
RXIN2
I
Receiver 2 Input. Receiver 2 bipolar input connected to coupling capacitor or
pulse transformer.
39
34
LOS1
O
Receiver 1 Loss of Signal. Asserted during LOS condition. Clear otherwise.
40
35
LOS2
O
Receiver 2 Loss of Signal. Asserted during LOS condition. Clear otherwise.
41
36
RXIN1
I
Receiver 1 Input. Receiver 1 bipolar input connected to coupling capacitor or
pulse transformer.
42
37
LPMOD2
I
Loop Mode 2. If driven high the loopback mode of channel 2 will be set to re-
mote loop. Otherwise the loopback mode will remain at local loop. The
actual loopback will be activated when the LOOPEN2 is asserted.
43
38
LPMOD1
I
Loop Mode 1. If driven high the loopback mode of channel 1 will be set to re-
mote loop. Otherwise the loopback mode will remain at local loop. The
actual loopback will be activated when the LOOPEN1 is asserted.
-
39, 40
NC
No Connect.
44
41,42
RVSS
VSS
Receive VSS. -5V ($5%).
45
43
RXNEG1
O
Receiver 1 Negative Data Out. Negative data output in NRZ or RZ format for
receiver 1.
46
44
RXPOS1
O
Receiver 1 Positive Data Out. Positive data output in NRZ or RZ format for
receiver 1.
47
45
RXNEG2
O
Receiver 2 Negative Data Out. Negative data output in NRZ or RZ format for
receiver 2.
48
46
RXPOS2
O
Receiver 2 Positive Data Out. Positive data output in NRZ or RZ format for
receiver 2.
49
47
VSS
Digital VSS. -5V ($5%).
50
48
E1/T1-
I
E1/T1- Selection. Apply logic one to select the receive data threshold
appropriate for E1 operation. Connect to ground to select the T1 data
threshold.