參數(shù)資料
型號(hào)： XRT72L74
廠商： Exar Corporation
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述： Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù)： 5/104頁
文件大小： 1301K
代理商： XRT72L74
á
XRT72L74
FOUR CHANNEL, DS3 ATM UNI/CLEAR-CHANNEL FRAMER
PRELIMINARY
REV. P1.0.0
5
Transmit DS3 Framer Block
These PLCP frames (or “Direct Mapped” ATM cells)
will be inserted into the payload of an outgoing DS3
frame, for transmission to the “Remote” Terminal, by
the Transmit DS3 Framer.
The Transmit DS3 Framer will transmit FEAC (Far
End Alarm & Control) messages to the Remote Ter-
minal Equipment via an on-chip FEAC Transceiver.
Additionally, the Transmit DS3 Framer can transmit
path maintenance data link messages to the
Remote Terminal Equipment via the on-chip LAPD
Transmitter.
Generates interrupts upon “Completion of Trans-
mission of LAPD and FEAC” Messages.
Note: The Transmit DS3 Framer will support either M13 or
C-bit Parity Framing Formats.
CLEAR-CHANNEL-FRAMING MODE OF OPERA-
TION
When the XRT72L74 has been configured to operate
in the “Clear-Channel Framer” mode, it can be func-
tionally subdivided into 6 different sections.
Receive Section
Transmit Section
Microprocessor Interface Section
Performance Monitor Section
Test and Diagnostic Section
Line Interface Unit Scan/Drive Section.
The features of each of the “Receive” and “Transmit”
Section (for Clear-Channel Framer applications) are
listed below.
THE RECEIVE SECTION
The purpose of the Receive Section of the XRT72L74
Clear-Channel DS3 Framer is to allow a given Termi-
nal to receive data from a remote terminal, which is
being transported over a DS3 data stream.
The Receive Section of the XRT72L74 Clear-Channel
DS3 Framer IC consists of the following functional
blocks.
Receive DS3 Framer block
Receive Overhead Data Output Interface block
Receive Payload Data Output Interface block
It should be noted that the “Receive DS3 Framer”
block is also active, when the XRT72L74 has been
configured to operate in the “ATM UNI” Mode.
Each of these functional blocks, within the Receive
Section of the Framer will do the following.
The Receive DS3 Framer block will synchronize to
the incoming DS3 data stream. All “inbound” DS3
data will be routed to the “Receive Payload Data
Output Interface” block. All overhead bits (which
are extracted from each “inbound” DS3 frame) will
be routed to the “Receive Overhead Data Output
Interface” block.
The Receive DS3 Framer block can also be used to
receive FEAC (Far-End-Alarm & Control) mes-
sages and PMDL (Path Maintenance Data Link)
messages via the “on-chip” Receive HDLC Control-
ler block.
The Receive Overhead Output Interface block out-
puts all overhead bits, which have been received
via the “inbound” DS3 data stream. The purpose of
the “Receive Overhead Output Interface” block is to
permit external circuitry (within the local terminal
equipment) to have access to these overhead bits,
for additional processing.
The Receive Payload Data Output Interface block
outputs all data bits which have been received via
the XRT72L74 device, to the local terminal equip-
ment. Since the “Receive Payload Data Output
Interface” block outputs both “payload” and “over-
head” data bits, to the local terminal equipment; the
“Receive Payload Data Output Interface” block also
includes an “Overhead Indicator” output pin. This
output pin pulses “High” whenever an overhead bit
is being output via the “Receive Payload Data Out-
put Interface” block.
THE TRANSMIT SECTION
The purpose of the Transmit Section of the
XRT72L74 Clear-Channel DS3 Framer is to allow a
local terminal to transmit data to a remote terminal
equipment, via a DS3 transport medium.
The Transmit Section of the XRT72L74 Clear-Chan-
nel DS3 Framer consists of the following functional
blocks.
Transmit Payload Data Input Interface block
Transmit Overhead Data Input Interface block
Transmit DS3 Framer block
It should be noted that the “Transmit DS3 Framer”
block is also active, whenever the XRT72L74 has
been configured to operate in the “ATM UNI” Mode.
The Transmit Section of the Clear-Channel DS3
Framer will:
Accept all “user” data, (which is required to be
transported to the Remote Terminal Equipment via
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