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SDH Configuration link
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Model 6511RC Switch Matrix Administrators’ Reference Guide
15 • SDH
LoopBack
The 6511RC WAN interface can initiate the following diagnostics loops:
•
sonetNoLoop(0)—Not in the loopback state. The 6511RC WAN interface has not initiated or is not under
a diagnostic loop.
•
sonetFacilityLoop(1)—The received signal at this interface is looped back out through the transmitter sec-
tion in the return direction.
•
sonetTerminalLoop(2)—The signal that is about to be transmitted is connected to the associated incoming
receiver.
•
sonetOtherLoop(3)—Data arriving at the 6511RC H.110 interface is looped back to the originating
device.
Line Coding
This is a fixed parameter. The 6511RC comes configured for NRZ (sonetMediumNRZ(4)).
SDH Mapping
The 6511RC Matrix Switch supports the two SDH mapping schemes ANSI and ETSI. ANSI mapping adds
an AU pointer to the VC-3 to create an AU-3 (Administrative Unit 3). In ETSI Mapping, a pointer is added to
VC-4 to create an AU-4.
•
au3Mapper(0)—When the AU mapping is set to AU-3,
each VC-3 High Order Path can be con
ured to carry up to 21 E1s mapped into TU-12.
•
au4Mapper(1)—
When the AU mapping is set to AU-4, the VC-4 High Order Path
three TUG-3s. Each TUG-3 can be configured to carry up to 21 E1s mapp
Path Trace Configuration
The Path Trace function verifies path connectivity between the two path-terminating nodes.The two SDH
path-terminating devices perform the trace over the STM-1 media segment between them. When Path Trace is
enabled, the SDH frame carries the Path Trace message in either the J1 byte or the path trace string. The value
you define for Path Trace Message Length determines which field will carry the Path Trace message, as specified
below:
1-byte Trace Message Length
Use the J1 byte for trace messaging, and ignore the contents of path trace string. The value of J0 may be any
positive integer in the range of 0 to 255.
16-byte Trace Message Length
Use the path trace string for path trace messaging, and ignore the contents of J1. The value of path trace string
may be any alphanumeric text string up to 15 characters long. The 16-byte field includes CRC-7 in the 16th
byte.
64-byte Trace Message Length
Use the section trace string for section trace messaging, and ignore the contents of J1. The value of section
trace string may be any alphanumeric text string up to 64 characters long. The 64-byte field does not include
any CRC.
Summary of Contents for 6511RC
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