TFRA08C13 Datasheet, PDF (72/188 Pages) Agere Systems – TFRA08C13 OCTAL T1/E1 Framer

TFRA08C13 OCTAL T1/E1 Framer
Alarms and Performance Monitoring (continued)
Preliminary Data Sheet
October 2000
T REFERENCE
POINT
V REFERENCE
POINT
NT2
(NT1 REMOTE)
CRC ERROR
NT1
DETECTED
CRC ERROR
DETECTED
ET
E BIT = 0
CRC-4 ERRORS AT THE ET,
E BIT = 0, ERROR EVENT AT THE ET REMOTE
E BIT = 0
Sa6
CRC-4 ERRORS DETECTED FROM NT1 REMOTE, THEN SET Sa6 = 001X
E = 0 DETECTED FROM NT1 REMOTE, THEN SET Sa6 = 00X1
CRC-4 ERRORS AT THE NT1
E BIT = 0, ERROR EVENT DETECTED AT THE NT1 REMOTE
COUNT:
1) CRC ERRORS,
2) E = 0,
3) Sa6 = 001X, AND
4) Sa6 = 00X1
5-3913(F)r.8
Figure 27. The T and V Reference Points for a Typical CEPT E1 Application
s CEPT auxiliary pattern alarm (AUXP) (FRM_SR1 bit 6). The received auxiliary alarm, register FRM_SR1 bit 6
(AUXP), is asserted when the receive framer is in the LFA state and has detected more than 253 10 (binary) pat-
terns for 512 consecutive bits. In a 512-bit interval, only two 10 (binary) patterns are allowable for the alarm to be
asserted and maintained. The 512-bit interval is a sliding window determined by the first 10 (binary) pattern
detected. This alarm is disabled when three or more 10 (binary) patterns are detected in 512 consecutive bits.
The search for AUXP is synchronized with the first alternating 10 (binary) pattern as shown in Table 31.
Table 31. AUXP Synchronization and Clear Sychronization Process
00 10 10 01 11
11
00 00
0
10 00 10
— sync —
—
— clear sync —
—
— sync . . . . . .
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