Maxim Integrated DS21Q55 - Manual (Page 7)

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information.
Note: This data sheet assumes a particular nomenclature of the T1 and E1 operating environment. In
each 125
µ
s T1 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 8 bits, which are numbered 1 to 8. Bit 1, the
MSB, is transmitted first. Bit 8, the LSB, 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).