參數(shù)資料
型號： LXP710PE
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)： 62/84頁
文件大小： 1108K
代理商： LXP710PE
LXP710
—
HDSL Framer/Mapper for 1168 kbps Applications
62
Datasheet
4.0
Application information
4.1
Target Applications
The LXP710 HDSL framer/mapper is primarily intended for transporting 2.048 MHz E1 traffic
over two loop systems. The data can either be framed (primarily channelized voice), or unframed
(primarily data transport). One end of a two-loop HDSL system is shown in
Figure 7
. E1 service
supports 32 64-kbps channels. Details of how the 32 channels are structured can be found in the
ITU G.704 document. Definition of the E1 signal is found in the ITU G.703 document.
An unframed data only transport system is shown is
Figure 8
. If no E1 framing signal is supplied,
the HDSL system must be operated in a two line point-to-point mode. Point to multipoint operation
is not possible in this mode. The system in
Figure 7
can also support unframed operation by setting
the LXP710 to unframed mode.
The LXP710 also supports a fractional service mode. Fractional service is defined to be when a
customer NTU is supplied with less than 32 channels of service. The E1 signal delivered is still
2.048 kbps with the unused channels filled with an idle code. Multipoint operation is when two or
more NTUs are supported (
Figure 9
). A multipoint system always operates the loops in a fractional
mode, while a fractional service can be one loop to one NTU. Fractional operation must always be
in framed E1 mode. Unframed operation can not select which E1 channels go to the appropriate
loops.
4.2
ETSI Compliant Operation
Many OEMs supply E1 transport systems that must meet the ETSI compliance found in
ETR(ETS)-152. The LXP710 supports two loop full 2M E1 and three loop fractional operation.
The LXP710 forms the E1 HDSL frame format in
Table 114
for each loop and provides access to
the overhead bits in all loops independently. This is necessary but not sufficient to make a piece of
equipment ETSI compliant. Other issues involve the start up process between the LTU and NTU.
The ETR (ETS) 152 document describes this process. Also see the SK70707/8 data sheet for how
the data pump activation fits into the ETSI start-up mode. Please contact Intel
’
s Telecom Marketing
department for software in assisting developing an E1 HDSL system.
The CRC-6 calculation method used in the LXP710 has been revised in the Rev 1.3 silicon. The
earlier revisions do detect CRC-6 errors, but included the stuffing bits, contrary to ETR-152. The
new revision corrects this, and is automatically compatible with the older revisions. This is
achieved by using the UIB1 bit. (See
Table 104 on page 58
.)
The LTU is the master unit and is typically located in a CO facility, while the NTU is typically
located in the CPE facility. In this document there are references to LTU (HTU-C). The LTU is an
ETSI designation, where the HTU-C is an ANSI designation. The HTU-x references are given for
those readers who may be more familiar with North American equipment nomenclature. Another
common name for the LTU is the local unit and the NTU is also known as the remote unit.
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