CX28344 Conexant, CX28344 Datasheet - Page 190

• Manufacturer Part Number: CX28344
• Description: (CX2834x) Dual / Triple / Quad / Hex / Octal - Enhanced DS3 / E3 Framer
• Manufacturer: Conexant

Frame Structure Summary
Table B-2. Overhead Bits in E3G751 Mode
Table B-3. Overhead Bytes in E3G832
B-2
10 FAS bits
1 A-bit
1 N-bit
12 C
4 stuff
opportunity bits
2 FA bytes
1 EM byte
1 TR byte
1 RDI bit
1 REI bit
3 PT bits
2 PD/MI bits
1 TM/SSM bit
1 NR byte
1 GC byte
j-
Field
Field
bits
Bits 1 to 10 for framing, bearing a “1111010000” (left-to-right) pattern
Bit 11 for remote alarm indication (RAI), set to 0 to signal error-free conditions, to 1 to signal RAI
Bit 12 for terminal data link (DL), bearing data link messages and flags when active, set to 1 when inactive
Bits 385 to 388, 769 to 772, and 1153 to 1156 for justification control bits of the payload data channels
Bits 1157 to 1160
Bytes 1 and 2 for framing, bearing a “1111011000101000” (left-to-right) pattern
Byte 61 for BIP-8 even parity, each bit set to 1 if the digital sum of the 537 corresponding payload and overhead
bits of the preceding frame equals 1, to 0 if it equals 0
Byte 121 for trail trace, bearing 16-byte trail trace messages
Bit 1 of byte 181 (MA byte) for Remote Defect Indication (RDI), set to 0 to signal error-free conditions, to 1 to
signal RDI
Bit 2 of byte 181 (MA byte) for Remote Error Indication (REI), set to 0 to signal error-free conditions, to 1 to
signal REI
Bits 3 to 5 of byte 181 (MA byte) for Payload Type (PT) information
Bit 6 and 7 of byte 181 (MA byte) for Payload-Dependent (PD) information or Multiframe Indication (MI)
Bit 8 of byte 181 (MA byte) for Timing Marker (TM) or Synchronization Status Message (SSM)
Byte 241 for network operator use, optionally carrying a terminal data link (DL)
Byte 301 for general-purpose communications channel, optionally carrying a terminal data link (DL)
As per ITU-T G.751, in E3-G751 mode, a frame is composed of 1536 bits, of which,
1508 form the payload, while 28 are overhead bits. The overhead bits are divided into
several fields, which are described in
As per ITU-T G.832-1995 and ETS 300 337-1997, in E3-G832 mode, a frame is
composed of 537 bytes (octets), of which, 530 form the payload, while 7 are overhead
bytes. The overhead bytes are divided into several fields, which are described in
Table
B-3.
Mindspeed Technologies™
Description
Description
Table
B-2.
CX28342/3/4/6/8 Data Sheet
28348-DSH-001-B