XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 348

• Manufacturer Part Number: XRT84L38IB
• Description: Network Controller & Processor ICs 8 Ch T1/E1 Framer
• Manufacturer: Exar Corporation

Specifications of XRT84L38IB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XRT84L38
OCTAL T1/E1/J1 FRAMER
problem further down the line and its transmission is not being received at the CPE. Figure ? below illustrates
the scenario in which the E1 connection from the Repeater to CPE is broken.
The Repeater, upon detection of Yellow Alarm originated from the CPE, will transmit a Blue Alarm, also known
as Alarm Indication Signal (AIS) to the CO. Blue alarm is an all ones pattern indicating that the equipment is
functioning but unable to offer service due to failures originated from remote side. It is sent such that the
equipment downstream will not lose clock synchronization even though no meaningful data is received. Figure
F
IGURE
113. G
Framer Block
DS1 Transmit
Framer Block
DS1 Receive
CO
ENERATION OF
Y
ELLOW
A
LARM BY THE
Transmit
Receive
Section
Section
DS1
DS1
Repeater
CPE
328
Transmit
Receive
Section
Section
UPON DETECTION OF LINE FAILURE
DS1
DS1
The DS1 line is
broken
Yellow
Alarm
CPE declares Red
Alarm internally
DS1 Transmit
Framer Block
Framer Block
DS1 Receive
CPE
REV. 1.0.1