XRT59L91ES Exar, XRT59L91ES Datasheet - Page 19

• Manufacturer Part Number: XRT59L91ES
• Description: Peripheral Drivers & Components - PCIs 1 CH E1 AFE
• Manufacturer: Exar

Specifications of XRT59L91ES

• Product Category: Peripheral Drivers & Components - PCIs
• Rohs: yes

The user can configure the XRT59L91 device to oper-
ate in the “Local Loop-back” Mode, by pulling the
“LLoop” input pin (pin 4) to VDD.
3.2
When the XRT59L91 device is configured to operate in
the “Remote Loop-back” Mode, the XRT59L91 device
will ignore any signals that are input to the TxPOS and
TxNEG input pins. The XRT59L91 device will receive
the incoming line signals, via the RTIP and RRing input
pins. This data will be processed through the entire
Receive Section (within the XRT59L91) and will output
to the “Receive Terminal Equipment” via the
It should be noted that during “Remote Loop-back”
operation, any data which is input via the RTIP and
R R ing
TR ing
LL oop
R TIP
TTIP
The Remote Loop Back Mode
Rev. 1.0.0
Figure 13. Illustration of the “Remote Loop-back” path, within the XRT59L91 Device
E q ualize r
R eceive
E q ualize r
R eceive
Lo op B ack
Lo op B ack
Lo cal
M U X
Lo cal
M U X
P e ak D ete ctor/
P e ak D ete ctor/
S licer
S licer
P u lse S ha ping
P u lse S ha ping
R em o te Loop B a ck
C ircuit
C ircuit
19
P a th
data will also be internally looped back to the “Transmit
Input Interface” block within the “Transmit Section”. At
this point, this data will be routed through the remainder
of the “Transmit Section” of the XRT59L91 device and
will be transmitted out onto the line via the “TTIP” and
“TRing” output pins.
Figure 13, illustrates the path that the data takes
(within the XRT59L91 device) when the chip is config-
ured to operate in the “Remote Loop-back” Mode.
RRING input pins, will also be output to the Terminal
Equipment, via the RxPOS and RxNEG output pins.
“RxPOS” and “RxNEG” output pins. Additionally, this
D etector
D etector
R xLO S
LO S
LO S
R eceive O utpu t
Transm it In put
Transm it In put
R eceive O utpu t
Lo op B ack
In terface
R em o te
Lo op B ack
In terface
XRT59L91
In terface
R em o te
In terface
M U X
M U X
R xP O S
R xN E G
R Loop
TxP O S
TxN E G
TxC lk