XRT86VL38 Datasheet, PDF (27/180 Pages) Exar Corporation – OCTAL T1/E1/J1 FRAMER/LIU COMBO - E1 REGISTER DESCRIPTION

REV. P1.0.9
PRELIMINARY
XRT86VL38
OCTAL T1/E1/J1 FRAMER/LIU COMBO - E1 REGISTER DESCRIPTION
TABLE 7: ALARM GENERATION REGISTER (AGR)
HEX ADDRESS: 0Xn108
BIT
FUNCTION
TYPE DEFAULT
DESCRIPTION-OPERATION
7 Transmit AUXP R/W
Pattern
0
Transmit Auxiliary (AUXP) Pattern
This bit permits the user to command the Transmit E1 Framer block to
transmit the AUXP Pattern to the remote terminal equipment, as depicted
below.
0 - Configures the Transmit E1 Framer block to NOT transmit the AUXP
Pattern (which is an unframed, repeating 1010... pattern).
1 - Configures the Transmit E1 Framer block to transmit the AUXP Pattern.
The device also supports AUXP pattern detection, please read register
(address 0xnB0A) for more detail.
6 Loss of Frame
R/W
Declaration Crite-
ria
0
Loss of Frame Declaration Criteria
This bit permits the user to select the “Loss of Frame Declaration Criteria”
for the Receive E1 Framer block, as depicted below.
0 = Loss of Frame is declared immediately if either CRC Multiframe Align-
ment or FAS Alignment is lost.
1 = Loss of Frame is declared immediately if FAS Alignment is lost. If CRC
Multiframe Alignment is lost for more than 8ms, E1 receive framer will
force a frame search.
5-4 Transmit YEL And R/W
Multi-YEL[1:0]
00 Yellow Alarm and Multiframe Yellow Alarm Generation [1:0]
These bits activate or deactivate the transmission of yellow and multiframe
yellow alarm. The Yellow alarm and multiframe Yellow alarm can be forced
to transmit as’1’, or be inserted upon detection of loss of alignment. The
decoding of these bits are explained as follows:
YEL[1:0]
YELLOW ALARM TRANSMITTED
00/10 Yellow Alarm and Multiframe Yellow Alarm transmission
is disabled.
01 Automatic Transmission of Yellow and CAS Multiframe
Yellow Alarms are enabled, as described below:
1. Whenever the Receive E1 Framer block declares the
LOF (Loss of FAS Framing) defect condition:
The corresponding Transmit E1 Framer block will automati-
cally transmit the Yellow Alarm indicator (by setting Bit 3 of
Time-Slot 0, within the non-FAS frames) to 1" whenever
(and for the duration that) the Receive E1 Framer block
declares the LOF defect condition.
2. Whenever the Receive E1 Framer block declares the
“Loss of CAS Multiframe Alignment” defect condition:
The corresponding Transmit E1 Framer block will automati-
cally transmit the CAS Multiframe Yellow Alarm indicator (by
setting Bit 6 within “Frame 0" of Time-slot 16) to “1” when-
ever (and for the duration that) the Receive E1 Framer block
declares the Loss of CAS Multiframe Defect condition.
11 Force Transmission of Yellow and Multiframe Yellow
Alarm
Both Yellow and Multiframe Yellow Alarm are transmitted as
‘1’ when this is enabled.
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