PEB2075 INFINEON [Infineon Technologies AG], PEB2075 Datasheet - Page 238

• Manufacturer Part Number: PEB2075
• Description: ICs for Communications Extended PCM Interface Controller
• Manufacturer: INFINEON [Infineon Technologies AG]

the PCM interface of the EPIC need not to be connected to a switching network since all
the B (and D) channel switching can be done inside the EPIC. In this special case, it is
sufficient to apply only a PCM clock to the EPIC, 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 EPIC. The STAR:PSS bit should then not be evaluated: it
stays at logical 0 all the time.
The PBX shown in the figure 83 offers 8 analog (t/r) subscriber lines, realized with two
quadruple codec/filter devices SICOFI-4 (PEB 2465). These can of course be replaced
by any IOM-2 compatible layer-1 device if digital lines are required. Any mixture of
codecs and digital layer-1 devices is also feasible.
The figure 83 also shows a digital trunk line (external line) which is realized with a U
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 by an elastic buffer inside the layer-1 devices.
Since the digital trunk line also needs a D channel handler, an ISDN Communication
Controller (ICC; PEB 2070) is assigned to that IOM-2 channel.
5.9.2.2 Small PBX
Figure 83 shows a realization example of a small PBX. If the total number of lines
(internal or external) is smaller than the capacity of the EPIC (32
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
k
interface coming from the CO. The NT-PABX mode of
238
(2
Application Hints
B + D) or 64
k
- frame are
PEB 2055
PEF 2055
B),
k
-