User manual

110
Setup T1 Parameter, Channel
The Superframe(SF) (also called D4 or 193S) framing format defines a superframe as 12 frames.
The Extended Superframe (ESF) (also called 193E) frame format groups 24 frames into its superframe.
Both the SF and ESF framing formats provide an actual payload data rate of 1.536 Mbps (192/193 = 1.536/1.544).
The T1 interface can be programmed to encode/decode its transmit/receive signals using Bipolar with Eight Zero Suppression
(B8ZS) coding.
Each T1 frame contains 1 byte of voice data for each of the 24 channels, that system needs then 8000 frames per second to
maintain those 24 simultaneous voice channels. Because each frame of a T1 is 193 bits in length (24 channels X 8 bits per
channel + 1 framing bit = 193 bits), 8000 frames per second is multiplied by 193 bits to yield a transfer rate of 1.544 Mbit/s
(8000 X 193 = 1544000).
The T1 format provides a 64 Kbps channel for each of 24 individual channels. Each of these channels is called a DS-0
channel or a time slot and consists of an eight-bit sample. A T1 frame is constructed by time division multiplexing these 24
time slots and inserting a framing bit at the beginning of the series. This results in 192 bits of channel data, plus a framing bit
(F-bit), for a total of 193 bits in a frame. Multiple frames are then grouped into superframes of 12 or 24 frames to provide for
framing synchronization and signaling.