bt8375kpf Conexant Systems, Inc., bt8375kpf Datasheet - Page 303
bt8375kpf
Manufacturer Part Number
bt8375kpf
Description
Single Chip Transceivers For T1/e1 And Integrated Service Digital Network Isdn Primary Rate Interfaces Systems
Manufacturer
Conexant Systems, Inc.
Datasheet
1.BT8375KPF.pdf
(323 pages)
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Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
Figure A-2. T1 Extended Superframe PCM Format
N8370DSE
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)
multiframe structure is extended to 24 frames. The channel 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
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
Figure
FR
23
8
A-2, and
A.4 Extended Superframe Format (ESF)
FR
Signalling Information
CH
24
A
24
B
C
24 Channels per Frame
D
ESF = 24 Frames
Table
Frame = 193 Bits
Multiframe
A-4, the
Bit 8
During:
Frame 24
Frame 18
Frame 12
Frame 6
Appendix A
A-5
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