
29
x r
PRELIMINARY
E3 UNI FOR ATM
XRT7234
REV. P1.0.0
66
99
RxLineClk
I
Receiver LIU (Recovered) Clock:
This input signal serves three purposes:
1. The Receive E3 Framer uses it to sample and “l(fā)atch” the signals at the
RxPOS and RxNEG input pins (into the Receive E3 Framer circuitry).
2. This input signal functions as the timing reference for the Receive
Framer block.
3. The Transmit E3 Framer block can be configured to use this input signal
as its timing reference.
Note:
This signal is the recovered clock from the external E3 LIU (Line
Interface Unit) IC, which is derived from the incoming E3 data.
67
100
NC
****
Not Bonded Out
68
101
RxRed
O
Receiver Red Alarm Indicator—Receive E3 Framer:
The UNI asserts
this output pin to denote that one of the following events has been
detected by the Receive E3 Framer:
LOS—Loss of Signal Condition
OFF—Out of Frame Condition
AIS—Alarm Indication Signal Detection
102
NC
****
Not Bonded Out
69
103
TxInClk
I
Transmit E3 Framer—Clock Signal:
The Transmit E3 Framer can be
configured to use this input signal as its timing reference. If this input pin
is chosen to be the timing reference, then the user must supply a high
quality 34.368 MHz signal to this input pin. In this configuration, frame
generation, by the Transmit E3 Framer, will be asynchronous (with any
other timing signals within the UNI). However, frame timing will be based
upon this clock signal.
Note:
This input pin should be tied to “GND” if it is not used as the Trans-
mit E3 Framer timing reference.
104
NC
****
Not Bounded Out
70
105
GND
***
Ground Signal Pin
106
NC
****
Not Bonded Out
71
107
TxFrameRef
I
Transmit E3 Framer—Frame Reference Input Pin:
The Transmit E3
Framer can be configured to use this input signal as the “framing” reference
for the Transmit E3 Framer block. If this input pin is chosen to be the framing
reference, then any rising edge at this input will cause the Transmit E3
Framer to begin its creation a new E3 M-frame. Consequently, the user
must supply a 8kHz clock signal to this input pin.
Note:
This input pin should be tied to “GND” if it is not used as the Transmit
E3 Framer frame reference signal.
108
NC
****
Not Bonded Out
PIN DESCRIPTION (CONTINUED)
Pin
No.
100 Pin Package
Pin No. 160
PinPackage
Symbol
Type
Description