Mdl Standards; Timeout Of Received Mdl Messages; Table 5: Mdl Message Strings And Message Types - Juniper JUNOSE 11.2.X PHYSICAL LAYER Configuration Manual

For e series broadband services routers - physical layer configuration
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JunosE 11.2.x Physical Layer Configuration Guide
46

MDL Standards

You can configure T3 interfaces to send MDL messages that comply with ANSI
T1.107a-1990 Standard for Telecommunications—Digital Hierarchy – Supplement to
Formats Specification (August 1990). MDL messages identify a particular link by sharing
common codes for data such as the equipment identifier, line identifier, frame identifier,
and unit.

Timeout of Received MDL Messages

When a line module receives an MDL message string, it stores the strings for a period of
10 seconds after the last message was received. If the line module does not receive
another message of any type containing the same string within 10 seconds, it erases the
local copy of the message.
Most MDL message strings are common to all three types of messages that can be
transmitted: path identifications, idle signals, and test signals. Certain message strings,
however, are unique to a particular message type. Table 5 on page 46 briefly describes
each MDL message string and indicates, with a checkmark ( ), the types of messages
in which it can be sent.

Table 5: MDL Message Strings and Message Types

Message
String
Description
eic
Equipment identification code
fic
Frame identification code
generator
Generator number
lic
Line identification code
pfi
Facility identification code
port
Equipment port number
unit
Unit identification code
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 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.
Path
Idle Signal
Message
Message
Copyright © 2010, Juniper Networks, Inc.
Test Signal
Message

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