HIGHLY INTEGRATED E1
LIU/FRAMER COMBOS VON EXAR!
The discontinuation of competing E1/T1/J1 product families has kicked up a lot of dust on
the market, leaving many manufacturers of telecom applications in urgent need of
redesigning their products.
Good thing CODICO brought aboard EXAR
- the innovation leader in the PDH/SDH segment - to its linecard years ago, as this
permits us to help make a transition to the very latest E1/T1/J1 LIU/Framer Combos as
smooth as possible for customers in need.
EXAR LIU/Framer Combos are based on chipsets that have been in use for some time now, and
they are tried and true as highly integrated solutions. As a result, EXAR offers a broad
spectrum of solutions supporting the T1 framing structure, to include D4, ESF, SLC-96,
T1DM and N-frame (non-framing) components. For pure E1 applications, CRC and CAS
multiframe formats are also available, while all of these options are selectable using
software.
The Combos are offered as single-channel versions (XRT86L30) and up to eight-channel
packages (XRT86LV38). EXAR also provides reference designs and C driver software at no
extra charge for all versions. As a result, nothing stands in the way of an
easy-to-implement redesign.
The XRT86VL38 is the flagship of the XRT86 series. It is an octal 1.544 or 2.048Mbit/s
E1/T1/J1 Framer with integrated LIUs and supports EXAR's R³ technology. The physical
interface has been optimized using high-ohmic internal impedances. Thanks to its patented
PAD structure, the XRT86VL38 offers protection during voltage and current peaks, and
supports hot swapping. The chipset also integrates an E1/T1/J1 Framer and LIU to permit
error handling in accordance with ANSI/ITU-T spezifications.
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Each individual framer has its own frame synchronizer and transmit-receive slip buffer. The slip
buffers can be independently enabled or disabled and can be set to frame the individuell
T1/E1/J1 signal formats.
Each channel includes 3 HDLC chips on both the transmit and receive side. The former serve
to encapsulate the content of the HDLC buffers into LAPD message frames, while the latter
extracts the content from the LAPD message from the E1/T1/J1 data stream and write it into
the receive HDLC buffers. Each framer also contains a Transmit
and Overhead Data Input port, as well as a Receive Overhead Output port. The two
ports permit the Data Link Terminal Equipment to directly access the outgoing and incoming
E1/T1/J1 data streams.
I would be glad to help if you require more information!
Ondrej Gavura, EXT 953
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