PSB21373HV11XT Infineon Technologies, PSB21373HV11XT Datasheet - Page 65

• Manufacturer Part Number: PSB21373HV11XT
• Manufacturer: Infineon Technologies
• Type: PCMr

Specifications of PSB21373HV11XT

• Number Of Channels: 1
• Number Of Adc's: 1
• Number Of Dac's: 1
• Number Of Adc Inputs: 1
• Pin Count: 44
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Data Sheet
2.3
The layer-1 functions for the line interface of the SCOUT-DX are:
– conversion of the frame structure between IOM and line interface
– conversion from/to binary to/from AMI coding
– level detection
– receive timing recovery
– IOM-2 timing synchronous to the line interface
– activation/deactivation procedures, triggered by primitives received over the IOM C/I
– execution of test loops
2.3.1
Figure 33 demonstrates the general principles of the line interface communication
scheme. A frame transmitted by the exchange (LT) is received by the terminal equipment
(TE) after a line propagation delay. The terminal equipment waits the minimum guard
time (t
exchange will begin a transmission every 250 s (known as the burst repetition period).
Within a burst, the data rate is 384 kbit/s.
One frame contains the framing bit (F) and the user channels (2B + D). It can readily be
seen that in the 250- s burst repetition period, 4 D-bits, 16 B1-bits and 16 B2-bits are
transferred in each direction. This gives an effective full duplex data rate of 16 kbit/s for
the D-channel and 64 kbit/s for each B-channel.
The B- and D- channels are scrambled according to the following feed back polynom:
AMI-coding is used for the line interface. A logical ‘0’ corresponds to a neutral level, a
logical ‘1’ is coded as alternate positive and negative pulses.
channel or by INFO's received from the line
g
= 15.625 s) while the line clears. It then transmits a frame to the exchange. The
Line Interface
Burst Frame
X
9
+ X
65
5
+ 1
PSB 21373
2002-05-13