XRT84L38IB Exar Corporation, XRT84L38IB Datasheet - Page 95

• 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

REV. 1.0.1
B
IT
N
5-4
3-2
UMBER
Yellow Alarm Generation
Select
Alarm Indication Signal
Generation Select
B
IT
N
AME
B
IT
R/W
R/W
T
YPE
Yellow Alarm Generation Select:
These READ/WRITE bit-fields allows the user to choose how the
XRT84L38 would generate Yellow Alarm and CAS Multi-frame
Yellow Alarm.
When these bits are set to 00:
Transmission of Yellow Alarm and CAS Multi-frame Yellow Alarm
is disabled.
When these bits are set to 01:
The Yellow Alarm bit is transmitted by echoing the received FAS
alignment pattern. If the correct FAS alignment is received, the
Yellow Alarm bit is set to zero. If the FAS alignment pattern is
missing or corrupted, the Yellow Alarm bit is set to one.
The CAS Multi-frame Yellow Alarm bit is transmitted by echoing
the received CAS Multi-frame alignment pattern (the four zeros
pattern). If the correct CAS Multi-frame alignment is received,
the CAS Multi-frame Yellow Alarm bit is set to zero. If the CAS
Multi-frame alignment pattern is missing or corrupted, the CAS
Multi-frame Yellow Alarm bit is set to one.
When these bits are set to 10:
The Yellow Alarm and CAS Multi-frame Yellow Alarms are trans-
mitted as zero.
When these bits are set to 11:
The Yellow Alarm and CAS Multi-frame Yellow Alarms are trans-
mitted as one.
Alarm Indication Signal Generation Select:
These READ/WRITE bit-fields activate and de-activate transmis-
sion of Alarm Indication Signal (AIS). There are two types of
Alarm Indication Signals - framed and unframed. A unframed
AIS signal is all-ones including all the framing bits. A framed AIS
signal is all-ones except the framing bits.
When these bits are set to 00:
The framer will disable AIS alarm generation.
When these bits are set to 01:
The framer will transmit unframed AIS alarm.
When these bits are set to 10:
The framer will generate AIS16. Only time slot 16 is carrying the
all ones pattern. The other time slots still carry framing and PCM
data.
When these bits are set to 11:
The framer will transmit framed AIS Alarm.
75
B
IT
D
ESCRIPTION
OCTAL T1/E1/J1 FRAMER
XRT84L38