DS2152
TTIP and TRING pins via a coupling transformer. The line driver can handle both long (CSU) and short
haul (DSX-1) lines.
Reader’s Note
This data sheet assumes a particular nomenclature of the T1 operating environment. In each 125 us 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 number 1 is the MSB and is
transmitted first. Bit number 8 is the LSB and is transmitted last. Throughout this data sheet, the
following abbreviations will be used:
D4
SLC-96
ESF
B8ZS
CRC
Ft
Fs
FPS
MF
BOC
HDLC
FDL
Superframe (12 frames per multiframe) Multiframe Structure
Subscriber Loop Carrier - 96 Channels (SLC-96 is an AT&T registered trademark)
Extended Superframe (24 frames per multiframe) Multiframe Structure
Bipolar with 8 0 Subsitution
Cyclical Redundancy Check
Terminal Framing Pattern in D4
Signaling Framing Pattern in D4
Framing Pattern in ESF
Multiframe
Bit Oriented Code
High Level Data Link Control
Facility Data Link
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