PEF 20550 H V2.1 Infineon Technologies, PEF 20550 H V2.1 Datasheet - Page 349

• Manufacturer Part Number: PEF 20550 H V2.1
• Description: IC INTERFACE CTRLR PCM MQFP80
• Manufacturer: Infineon Technologies
• Series: ELIC®r

Specifications of PEF 20550 H V2.1

• Function: Line Card Controller
• Interface: ISDN, PCM
• Number Of Circuits: 1
• Voltage - Supply: 5V
• Current - Supply: 15mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-SQFP
• Includes: Change Detection, Power-Up Reset Generation
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Other names: PEF20550HV2.1XT; PEF20550HV21XP; SP000007794; SP000007795

layer-1 device, IEC-Q (PEB 2091), operated in NT-PABX mode. The PBX can therefore
be connected directly to the U
the U
compensated for in an elastic buffer inside the layer-1 devices.
Signaling control for the S
HDLC controller.
Since the digital trunk line also needs a D channel handler, the ELIC SACCO-B HDLC
controller is assigned to that IOM-2 channel.
5.9.2.2 Small PBX
Figure 118 shows a realization example of a small PBX. If the total number of lines
(internal or external) is smaller than the capacity of the ELIC (32
the PCM interface of the ELIC need not to be connected to a switching network since all
the B (and D) channel switching can be done inside the ELIC. In this special case, it is
sufficient to apply only a PCM clock to the ELIC, the PCM frame synchronization signal
(8 kHz) can be omitted. The IOM-2 clock and framing signals DCL and FSC are still
generated correctly by the ELIC. The STAR:PSS bit should then not be evaluated: it
stays at logical 0 all the time.
The PBX shown in the figure 118 offers 8 analog (t/r) subscriber lines, realized with two
quadruple codec/filter devices SICOFI-4 (PEB 2465) and one digital, so subscriber
interface realized with the SBCX (PEB2081).
The figure 119 also shows a digital trunk line (external line) which is realized with a U
the layer-1 device delivers a reference clock which is synchronous to the received S or
U
differences between the local IOM-2 frame and the received S or U
Semiconductor Group
k
- frame and that can be used to synchronize the local PBX clock generator. Any phase
k
- layer-1 devices is similar to the LT-T mode of the S layer-1 devices: in both cases
0
subscriber interface is performed by the ELIC SACCO-A
k
interface coming from the CO. The NT-PABX mode of
349
(2
Application Hints
B + D) or 64
k
PEB 20550
PEF 20550
- frame are
01.96
B),
k
-