XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 386

• 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
Next, let us consider the scenario in which the signaling and data link channel (the time slot 16) of an E1 line
between a far-end terminal (for example, the CO) and a near-end terminal (for example, the repeater) is
impaired. In this case, the CAS signaling data received by the repeater is corrupted. The Repeater will then
send an all ones pattern in time slot 16 (AIS16 pattern) downstream to the CPE. The repeater will also
generate a CAS Multi-frame Yellow Alarm upstream to the CO to indicate the loss of CAS Multi-frame
F
R
IGURE
EPEATER
122. G
Framer Block
Framer Block
E1 Transmit
E1 Receive
CO
ENERATION OF
Repeater generates
Yellow Alarm to CO
The E1 line is
Y
ELLOW
broken
Yellow
Alarm
A
LARM BY THE
Transmit
Receive
Section
Section
Repeater declares
E1
E1
Repeater
Red Alarm
internally
366
CPE
Transmit
Receive
Section
Section
UPON DETECTION OF
E1
E1
CPE detects AIS and
Alarm to Repeater
generates Yellow
generates AIS
Repeater
to CPE
Yellow
Alarm
AIS
AIS
ORIGINATED BY THE
Framer Block
Framer Block
E1 Transmit
E1 Receive
CPE
REV. 1.0.1