XRT82D20ES Exar, XRT82D20ES Datasheet - Page 25

• Manufacturer Part Number: XRT82D20ES
• Description: Peripheral Drivers & Components - PCIs 1 CH E1 LIU
• Manufacturer: Exar

Specifications of XRT82D20ES

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

REV. 1.0.8
When the XRT82D20 is configured to operate in the Remote Loop-Back Mode, the XRT82D20 will ignore any
signals that are input to the TPOS and TNEG input pins. The XRT82D20 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
XRT82D20) and will output to the Receive Terminal Equipment via the RPOS and RNEG output pins.
Additionally, this 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
XRT82D20 and will be transmitted out onto the line via the TTIP and TRing output pins.
Figure
operate in the Remote Loop-Back Mode.
N
F
2.2
OTE
IGURE
RNEG
TNEG
RPOS
TPOS
: During Remote Loop-Back operation, any data which is input via the RTIP and RRING input pins, will also be output
RClk
TClk
to the Terminal Equipment, via the RPOS and RNEG output pins.
19, illustrates the path that the data takes (within the XRT82D20) when the chip is configured to
19. I
The Remote Loop Back Mode
LLUSTRATION OF THE
Encoder
Decoder
HDB3
HDB3
Loopback
Remote
R
MUX
MUX
EMOTE
L
OOP
-B
ACK PATH
Jitter Attenuator
Generator
Recovery
24
Data &
Timing
Timing
,
SINGLE CHANNEL E1 LINE INTERFACE UNIT
WITHIN THE
Tx Pulse
Shaper
Detect
Slicer
Data
LOS
XRT82D20
Line
Driver
Detector
Peak
XRT82D20
TTIP
TRing
RLOS
RTIP
RRing
MClk