XRT59L91ES Exar, XRT59L91ES Datasheet - Page 17

• 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

Timing Requirements associated with Declaring
and Clearing the LOS Indicator.
The XRT59L91 device was designed to meet the ITU-
T G.775 specification timing requirements for declar-
ing and clearing the LOS indicator. In particular, the
XRT59L91 device will declare LOS, between 10 and 255
UI (or E1 bit-periods) after the actual time the LOS
condition occurred. Further, the XRT59L91 device will
2.5
The purpose of the “Receive Output Interface” block is
to interface directly with the “Receiving Terminal
Equipment”. The “Receive Output Interface” block
outputs the data (which has been recovered from the
incoming line signal) to the “Receive Terminal Equip-
ment” via the “RxPOS and RxNEG output pins.
If the “Receive Section” of the XRT59L91 device has
received a “Positive-Polarity” pulse, via the RTIP and
R X IN
L O S O u tp u t P in
The “Receive Output Interface” Block
Figure 11. The Behavior of the LOS Output Indicator, in response to the Loss of Signal,
Rev. 1.0.0
N ote : F o r E 1 , 1 U I = 4 8 8 n s
U I
0
10 U I
O ccu rre n ce
C o n d itio n
o f L O S
A ctu a l
G .7 7 5 C o m p lia n ce
and the Restoration of the Signal
255 U I
17
T im e R a n g e
D e cla ra tio n
clear the LOS indicator within 10 to 255 UI after
restoration of the incoming line signal. Figure 11
illustrates the LOS Declaration and Clearance behav-
ior, in response to first, the “Loss of Signal” event and
then afterwards, the restoration of the signal.
RRing input pins, then the Receive Output Interface will
output a pulse at the “RxPOS” output pin.
Similarly, if the “Receive Section” of the XRT59L91
device has received a “Negative-Polarity” pulse, via
the RTIP and RRing input pins, then the Receive Output
Interface will output a pulse at the “RxNEG” output pin.
L O S
fo r
R e sto re d
S ig n a l
L in e
is
U I
0
T im e R a n g e
C le a ran ce
XRT59L91
L O S
fo r
10 U I
G .7 7 5 C o m p lia n ce
255 U I