參數(shù)資料
型號(hào)： PT7D6555
英文描述： -40V Single P-Channel HEXFET Power MOSFET in a TSOP-6 (Micro 6) package
中文描述： 擴(kuò)展的PCM接口控制器？
文件頁數(shù)： 8/56頁
文件大?。?/td> 489K
代理商： PT7D6555
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Preliminary Data Sheet
PT7D6555
Extended PCM Interface Controller
8
PT0105(08/02)
Ver:0
Typical Applications
Digital Line Card
Switching, Layer-1 Control
The PT7D6555 provides a switching capability for up to 32
digital subscribers between the PCM system highway and the
IOM-2 interface (64 B-channels). Typically it switches 64-
kbit/s channels between the PCM and the IOM-interfaces.
Moreover it is able to handle also 16-, 32- and 128-kbit/s
channels.
The signalling handler supports the command/indication (C/
I) channel which is used to exchange predefined layer-1 infor-
mation with the transceiver device.
A monitor handler supports the handshake protocol defined
on the IOM-monitor channel. It allows programming of layer-
1 devices, which do not have a dedicated
μ
P interface. The
PT7D6555 can be operated in tandem, i.e. one device is ac-
tive, and another one is a backup device. The backup device
can instantaneously take over from the active device when the
active device fails. Due to this tandem operation capability
and the high number of ISDN subscribers, which can be con-
nected to one PT7D6555, the use of single line cards is fea-
sible.
Several line card architectures are possible.
Figure 1. Line Card Architecture for Completely Decentral D-Channel Processing
Decentralized D-Channel Handling
In completely decentral D-channel processing architectures
(see Figure 1), the processing capacity of the line card is usu-
ally designed to avoid blocking situations even under maxi-
mum conceivable D-channel traffic conditions. In such archi-
tecture the PT7D6555 switches the B-channels and performs
C/I and monitor channel control.
The PT7A6527 handle the layer 2 functions for signalling and
data packets in the D-channel. They transfer the extracted data
via the mP and an HDLC controller, e.g. the PT7A6525 to the
system. One of the channels of the PT7A6525 may access ei-
ther a time slot of programmable bandwidth on one of the
system highways or a separate signalling highway.
In both cases the highway capacity used for packet traffic can
be shared among several line cards due to the statistical multi-
plexing capabilities of the PT7A6525.
Central D-Channel Processing
In this application the PT7D6555 not only switches the B-
channels and performs the C/I- and monitor channel control
function, but switches also the D-channel data onto the system
highway. In upstream direction the PT7D6555 can combine
up to four 16-kbit/s D-channels into one 64-kbit/s channel. In
downstream direction it provides the capability to distribute
one 64-kbit/s channel to four 16-kbit/s channels.
PT7D6555
PT7A6525
IOM -2 Interface
μP
s-Data
p-Data
s+p
Data
PT7A6527
PT7A6527
s-Data
Packet Highway with
Collision Resolution
PCM
Highway
B
B
S
B
B
B
B
Example Frame
Structure
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