
Data Sheet
January 1999
T7698 Quad T1/E1 Line Interface and Octal T1/E1 Monitor
84
Lucent Technologies Inc.
Frame Monitors
(continued)
Frame Monitor Status/Counter Registers
(continued)
Facility Event Register (Framer_SR5)
A bit set to 1 indicates the frame monitor has recently received the given condition.
Table 70. Facility Event Register (Framer_SR5)
Facility Errored Event Register (Framer_SR6)
A bit set to 1 indicates the frame monitor has recently received the given condition.
Table 71. Facility Errored Event Register (Framer_SR6)
Bit
0
Description
Change of Frame Alignment (CFA).
A 1 indicates the frame monitor established a new
alignment which differs from the previous alignment.
Change of Superframe Alignment (CSFA).
A 1 indicates the frame monitor has established
superframe alignment in the D4 and SLC-96 modes. This alignment is established only after
frame alignment is determined. This bit is zero in all other framing modes.
CRC Monitor Reset (CRCRST).
A 1 indicates the CRC multiframe alignment in the frame
monitor has been established. In ESF mode, this event coincides with the establishment of
the frame alignment. In CEPT mode, this event will always follow the establishment of the pri-
mary basic frame.
Reserved.
Indication of Excessive CRC Errors (CRC_EXC).
A 1 indicates that the frame monitor has
detected excessive CRC errors. In ESF mode, 32 CRC errors out of 33 CRC checks set the
CRC_EXC bit, if Framer_PR14, bit 1 = 0. And >320 CRC errors in one second set the
CRC_EXC bit, if Framer_PR14, bit 1 = 1. In CEPT modes, >914 CRC submultiframe errors
out of 1000 CRC submultiframe checks set the CRC_EXC bit. If Framer_PR14 bit 0 is set to
0, then excessive CRC errors force loss of frame alignment.
CRC-4 Multiframe Alignment Timer Expire Indication.
A 1 indicates either the
100 ms or the 400 ms CRC-4 interworking timer expired (depending on the mode chosen
through register Framer_PR1). This bit is 0 in the DS1, CEPT with no CRC-4, or CEPT with
no timer modes.
1
2
3—5
6
7
Bits
0
1
Description
Line Format Violation (LFV).
A 1 indicates that the frame monitor detected a line format violation.
Frame-Bit Error (FBE).
A 1 indicates that the frame monitor detected a frame-bit or frame alignment
pattern error.
Received CRC Errors (RCRCEP).
A 1 indicates that the frame monitor has detected CRC errors.
Receive E bit = 0 (REPITP).
A 1 indicates that the frame monitor has detected an E bit = 0 condition.
This bit is 0 in the DS1 mode.
Reserved.
Line Loopback On Code Detect (LLBON).
A 1 indicates that the frame monitor detected the line loop-
back enable code. This code is defined in the ANSI T1.403 as a framed 00001 pattern where the frame
bit is inserted into the pattern.
Line Loopback Off Code Detect (LLBOFF).
A 1 indicates that the frame monitor detected the line
loopback disable code. This code is defined in the ANSI T1.403 as a framed 001 pattern where the
frame bit is inserted into the pattern.
2
3
4—5
6
7