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XRT86VL30 Datasheet(PDF) 77 Page - Exar Corporation

Part # XRT86VL30
Description  SINGLE T1/E1/J1 FRAMER/LIU COMBO - T1 REGISTER DESCRIPTION
PDF  175 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT86VL30 Datasheet(HTML) 77 Page - Exar Corporation

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XRT86VL30
72
REV. 1.0.0
SINGLE T1/E1/J1 FRAMER/LIU COMBO - T1 REGISTER DESCRIPTION
1.1
T1 Synchronization status message
T1 synchronization messages are sent through the FDL (Facility Data Link) bits by using a BOC (Bit Oriented
Code) controller within the XRT86VL30 device. The most right bit position in the BOC code is sent first. The
SSM message that are used in typical BITS applications are shown below. These messages are defined in
specification ANSI T1.101-1999.
1.2
T1 BOC Receiver
If enabled, the T1 BOC receiver will monitor the FDL bits for SSM messages with various features being
supported. Some of these features are Change of Status Alarm, 3 independent pre-set codes for matching
validation (each having its own alarm), filter settings for consecutive pattern qualification, and many more.
NOTE: If the receive BOC is enabled. the part will still report BOS and MOS messages as described in the register
descriptions.
1.3
T1 BOC Transmitter
The T1 BOC transmitter will automatically insert an SSM message in the correct FDL bit positions if enabled.
Once the message is stored in the TFDL register, Bit 0=1 sends the message, automatically followed by the
Abort Sequence.
TABLE 55: T1 SSM MESSAGES
QUALITY LEVEL
DESCRIPTION
BOC CODE
1
Stratum 1 Traceable
00000100 11111111
2
Synchronized Traceability Unknown
00001000 11111111
3
Stratum 2 Traceable
00001100 11111111
4
Stratum 3 Traceable
00010000 11111111
5
SONET Minimum Clock Traceable
00100010 11111111
6
Stratum 4 Traceable
00101000 11111111
7
Do Not Use for Synchronization
00110000 11111111
User Assignable
Reserved for Network Synchronization Use
01000000 11111111



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