Issue 2.0
1-4 General Information <US Only>
2.2 Frame Configuration for 24 DTI
According to the AT&T Specifications for 24-channel transmission, there are two
frame configurations: 12 Multiframe (D4) and 24 Multiframe (ESF).
12 Multi-Frame (D4)
This frame has 12 Multiframes, and each Multiframe has a 24-channel PCM
signal (8 bits/channel) and an S (Superframe) bit. Figure 1-4 Frame Configuration
of 24-DTI (12 Multiframe) shows the frame configuration, and Figure 1-5 Frame
Configuration of 24-DTI (24 Multiframe) shows the frame bit assignment.
Input
Line Rate
1.544 Mbps
± 200 ppm (130 ppm)
Pulse Amplitude (Base to Peak) 1.5 volts ~ 3 volts
Frame Synchronization Pattern 100011011100
Input Jitter ITU-T Fig.1/G743
Wander
±138UI, –193UI or –138UI, +193UI
Cable Length from SV9100 to
MDF or External Equipment
Maximum 196m (655 ft.) with
(22 AWG) twisted-pair cable
AMI: Alternate Mark Inversion
ZCS: Zero Code Suppression
B8ZS: Bipolar Eight Zero Substituting
Figure 1-4 Frame Configuration of 24-DTI (12 Multiframe)
s
CH1 CH2 CH3 CH24
123456781234567812345678 12345678
s
FRAME 1 FRAME 2 FRAME 3 FRAME 12
128 S
S: Superframe Bit
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