XRT75L03D Datasheet, PDF (25/134 Pages) Exar Corporation – THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

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XRT75L03D
THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER REV. 1.0.0
GENERAL CONTROL PINS
PIN #
SIGNAL NAME
TYPE
DESCRIPTION
72
STS-1/DS3_0
98
STS-1/DS3_1
81
STS-1/DS3_2
I
STS-1/DS3 Select Input - Channel 0
STS-1/DS3 Select Input - Channel 1
STS-1/DS3 Select Input - Channel 2
This input pin, along with the corresponding E3_n input pin is used the to config-
ure a given channel within the XRT75L03D into either the DS3, E3 or STS-1
Modes.
"High" - Configures the corresponding channel to operate in the STS-1 Mode
provided that the corresponding E3_n input pin is pulled "Low".
"Low" - Configures the corresponding channel to operate in DS3 Mode provided
that the corresponding E3_n input pin is pulled "Low".
NOTES:
1. This input pin is ignored and should be tied to GND if the XRT75L03D
has been configured to operate in the Host Mode or if the
corresponding E3_n input pin is pulled "High".
2. This input pin is internally pulled low.
74
RLB_0
96
RLB_1
83
RLB_2
I Remote Loop-back - RLB Input - Channel 0:
Remote Loop-back - RLB Input - Channel 1:
Remote Loop-back - RLB Input - Channel 2:
This input pin along with LLB_n is used to configure different Loop-Back modes.
RLB_n
0
0
1
1
LLB_n
0
1
0
1
Loopback Mode
Normal (No Loop-Back) Mode
Analog Loop-Back Mode
Remote Loop-Back Mode
Digital Local Loop-Back Mode
NOTE: This input pin is ignored and should be connected to GND if the
XRT75L03D is operating in the HOST Mode.
73
LLB_0
97
LLB_1
82
LLB_2
I
Loop-Back Select - LLB Input - Channel 0
Loop-Back Select - LLB Input - Channel 1
Loop-Back Select - LLB Input - Channel 2
Please see description above for RLB_n
102
TEST
**** Factory Test Mode Input Pin
This pin must be connected to GND for normal operation.
NOTE: This input pin is internally pulled "Low".
20