DS2155L datasheet(14/240 Pages) MAXIM

14 / 240 page

DS2155

14 of 240

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

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

Signaling Framing Pattern in D4

Terminal Framing Pattern in D4

HDLC

High-Level Data Link Control

Multiframe

SLC–96

Subscriber Loop Carrier—96 Channels

DS2155L Datasheet(PDF) 14 Page - Maxim Integrated Products