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DS2155 Datasheet(PDF) 12 Page - Dallas Semiconductor |
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DS2155 Datasheet(HTML) 12 Page - Dallas Semiconductor |
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12 / 262 page  DS2156 12 of 262 Reader’s Note: This data sheet assumes a particular nomenclature of the T1 operating environment. In each 125 ms frame there are 24 8-bit channels plus a framing bit. It is assumed that the framing bit is sent first followed by channel 1. Each channel is made up of eight bits that are numbered 1 to 8. Bit number 1 is the MSB and is transmitted first. Bit number 8 is the LSB and is transmitted last. The term “locked” is used to refer to two clock signals that are phase- or frequency-locked or derived from a common clock (i.e., a 1.544MHz clock can be locked to a 2.048MHz clock if they share the same 8kHz component). Throughout this data sheet, the following abbreviations are used: B8ZS Bipolar with 8 Zero Substitution BOC Bit-Oriented Code CRC Cyclical Redundancy Check D4 Superframe (12 frames per multiframe) Multiframe Structure ESF Extended Superframe (24 frames per multiframe) Multiframe Structure FDL Facility Data Link FPS Framing Pattern Sequence in ESF Fs Signaling Framing Pattern in D4 Ft Terminal Framing Pattern in D4 HDLC High-Level Data Link Control MF Multiframe SLC–96 Subscriber Loop Carrier—96 Channels |
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