參數(shù)資料
型號(hào)： 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)： 67/84頁
文件大?。?/td> 1108K
代理商： LXP710PE
HDSL Framer/Mapper for 1168 kbps Applications
—
LXP710
Datasheet
67
out and then wait for the LTU activation sequence. In instances of local lightning or a cable is cut,
the system can recover on its own when the lightning transient dies down, or when the cable is
spliced.
Point-to-point systems can program LXP710
’
s automatic loop swap feature to maintain operation
of selected E1 channels on a surviving loop when the primary loop is cut.
In rack systems, the LTU should report abnormalities to the rack master. Local unit problems can
be defined in terms of errors from either the local E1 or HDSL interface. Remote units can also
experience errors. The NTU needs to set the appropriate bits in the HDSL loop. The rta, remote
terminal alarm, bit can be used when no other bit is appropriate. Then the LTU can interrogate the
NTU through the eoc bits to determine the problem.
The ETR (ETS) 152 defines the eoc protocol and certain actions to be performed, but leaves open
many register definitions. Again OEM implementations will differ.
4.4.4
Diagnostic Operation
The diagnostic mode is used when a system is installed to ensure proper operation or to
troubleshoot an operational system. The LTU and NTU can be put into loopback modes to isolate
sections of the system for performance measurement or troubleshooting. Payload transport
operation is shut off or limited in this mode. A HDSL system should be designed to minimize the
impact on a properly operating loop when working on the failed one. The LXP710 provides
features to change the loop timing source to maintain proper E1 timing.
4.4.5
External Communication
This is usually a background mode for rack systems. The OEM must use a protocol to supply the
LTU with configuration information and receive diagnostic data from it. The external system can
support remote performance monitoring and command loopbacks, error injections, etc. This also
provides the option to upgrade the HDSL system
’
s application software if it is contained in a
FLASH EPROM, taking care not to alter the board bootload software.
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