
IDT82P2281
SINGLE T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
Programming Information
268
August 20, 2009
E1 FRMR Mode 1
(04EH)
BIT2C:
This bit determines the criteria of out of Basic frame synchronization.
= 0: 3 consecutive FAS pattern errors lead to out of Basic frame synchronization.
= 1: 3 consecutive FAS pattern errors or 3 consecutive NFAS errors lead to out of Basic frame synchronization.
CASEN:
= 0: Disable searching for the Channel Associated Signaling (CAS) Multi-Frame.
= 1: Enable searching for the Channel Associated Signaling (CAS) Multi-Frame after the Basic frame synchronization is acquired.
CRCEN:
= 0: Disable searching for the CRC Multi-Frame.
= 1: Enable searching for the CRC Multi-Frame after the Basic frame synchronization is acquired.
CNTNFAS & WORDERR:
These two bits determine the criteria of FAS/NFAS Bit/Pattern Error generation:
TS16C & SMFASC:
These two bits determine the criteria of out of CAS Signaling Multi-Frame synchronization:
C2NCIWCK:
= 0: Stop searching for CRC Multi-Frame alignment pattern in CRC to non-CRC interworking mode.
= 1: Enable searching for CRC Multi-Frame alignment pattern even if CRC to non-CRC interworking has been declared.
Bit No.
7
6
5
4
3
2
1
0
Bit Name
BIT2C
CASEN
CRCEN
CNTNFAS
WORDERR
TS16C
SMFASC
C2NCIWCK
Type
R/W
Default
11
1
0
WORDERR
CNTNFAS
Error Generation
0
Each bit error in FAS is counted as an error event.
1
0
A FAS pattern error is counted as an error event.
0
1
Each bit error in FAS or NFAS error is counted as an error event.
1
A FAS pattern error or NFAS error is counted as an error event.
TS16C
SMFASC
Out Of CAS Signaling Multi-Frame Synchronization Criteria
X
0
2 consecutive CAS Signaling Multi-Frame Alignment Pattern Errors occur.
0
1
2 consecutive CAS Signaling Multi-Frame Alignment Pattern Errors occur or all the contents in TS16 are zeros for one
Signaling Multi-Frame.
1
2 consecutive CAS Signaling Multi-Frame Alignment Pattern Errors occur or all the contents in TS16 are zeros for two
consecutive Signaling Multi-Frames.