PSB 21373 H V1.1 Infineon Technologies, PSB 21373 H V1.1 Datasheet - Page 65

• Manufacturer Part Number: PSB 21373 H V1.1
• Description: IC SPEECH AND VOICE MQFP-44
• Manufacturer: Infineon Technologies
• Series: SCOUT™r

Specifications of PSB 21373 H V1.1

• Function: CODEC
• Interface: IOM-2, SCI
• Number Of Circuits: 1
• Voltage - Supply: 5V
• Current - Supply: 97.5mA
• Mounting Type: Surface Mount
• Package / Case: 44-BQFP
• Includes: Activation and Deactivation, Channel Handler, DTMF / Tone / Ringing Generator, HDLC Controller, Speakerphone, Voice Monitoring
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Operating Temperature: -
• Other names: PSB21373HV1.1XT; PSB21373HV11XT; SP000007602

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