Juniper JUNOSE 11.2.X MULTICAST ROUTING, Configuration Manual

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Table 9: MDL and FDL Message Strings and Message Types (continued)
Test Signal
Message Idle Signal
Message Path
Message
Description
Message
String
✓ ✓ ✓
Frame identification code fic
✓ – – Generator number generator
✓ ✓ ✓ Line identification code lic
– – ✓ Facility identification code pfi
– ✓ – Equipment port number port
✓ ✓ ✓
Unit identification code unit
As long as another message of any type containing the same string is received within 10
seconds, the line module retains the local copy of the message string and resets the
10-second timer for that string.
For example, if a line module receives an MDL or FDL test signal message containing an
eic string, and then receives a idle signal message within 10 seconds that also contains
an eic string, it retains the local copy of the most recent eic string received and resets the
10-second timer for that message. However, if 10 seconds pass without the line module
receiving a path identification, test signal, or idle signal message containing an eic string,
the line module erases the local copy of the eic message string.
For message strings that are unique to a particular message type, the line module must
receive another message of the same type containing this string in order to retain the
local copy of the string and reset the timer. For example, if the line module receives a
test signal message containing a generator string and does not receive another test signal
message within 10 seconds, it erases the local copy of the generator string.
Frequency of FDL Path Messages
E Series routers transmit FDL path identifier messages every second. This behavior
complies with the ANSI T1.403 specification (listed in “References” on page 113) and is
consistent with the MDL implementation for E Series routers.
Higher-Level Protocols
See ERX Module Guide , Appendix A , Module Protocol Support for information about the
higher-level protocols that cOCx/STMx interfaces support.
Platform Considerations
You can configure cOCx/STMx interfaces on the following E Series Broadband Services
Routers:
• ERX1440 router
• ERX1410 router
107 Copyright © 2010, Juniper Networks, Inc.
Chapter 4: Configuring Channelized OCx/STMx Interfaces