CX28398 Conexant Systems, CX28398 Datasheet - Page 283

• Manufacturer Part Number: CX28398
• Description: (CX28394 - CX28398) Quad/x16/Octal?T1/E1/J1 Framers
• Manufacturer: Conexant Systems

CX28394/28395/28398
Quad/x16/Octal—T1/E1/J1 Framers
Figure A-2. T1 Extended Superframe Format
100054E
FPS
Fs
or
FDL
CRC
CH
FR
1
1
1
CH
2
FR
2
2
8 Bits per Channel
A.4 Extended Superframe Format (ESF)
In Extended Superframe Format (ESF), as illustrated in
Table
structure is identical to D4 (SF) format. Robbed-bit signaling is accommodated in
frame 6 (A-bit), frame 12 (B-bit), frame 18 (C-bit), and frame 24 (D-bit).
The F-bit pattern of ESF contains three functions:
1.
2.
3.
3
A-4, the multiframe structure is extended to 24 frames. The channel
Framing Pattern Sequence (FPS), which defines the frame and multiframe
boundaries.
Facility Data Link (FDL), which allows data such as error performance to
be passed within the T1 link.
Cyclic Redundancy Check (CRC), which allows error performance to be
monitored and enhances the reliability of the receiver's framing algorithm.
4
CH
13
FR
13
Conexant
5
6
7
FR
23
8
A.4 Extended Superframe Format (ESF)
FR
Signaling Information
CH
24
A
24
B
C
D
24 Channels per Frame
ESF = 24 Frames
Figure A-2
Frame = 193 Bits
Multiframe
Bit 8
During:
Frame 24
Frame 12
Frame 18
Frame 6
and
Appendix A
A-5