Alcatel-Lucent 1643 AMS Applications And Planning Manual page 256

SHDSL Overview
Remote management and supervision of SHDSL devices
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Purpose
This chapter describes the remote management of NTUs and SRUs which is controlled
by the LTU.
EOC Management Reference Model
The LTU maintains an information database of all attached NTUs and SRUs for the
purpose of configuration, performance and fault information retrieval or control by
network management. All elements attached to an SHDSL span have to respond to
queries made to them from other elements. The database in the LTU is considered the
"master database". Conflicts between the entities in the SHDSL span are resolved in
favour of the LTU. For 1643 Access Multiplexer AM / 1643 Access Multiplexer Small
AMS only communication initiated by the LTU is supported.
The alarm status of the SHDSL devices (NTU and SRUs) that are attached to an
SHDSL port on the LTU is polled by the LTU in regular intervals. Polling is realized
by means of EOC messages or by a combination of EOC and EOC-ext. messages (see
below).
The following figure shows the reference configuration for management purposes:
C side
LTU
1
EOC messages
Management of the SRUs and NTUs is exercised via the Embedded Operations
Channel (EOC) in the SDHSL overhead. The capacity of this channel is 20 bits per 6
ms frame or 3333 kbit/s. EOC messages are protected by a CRC16 code, appended in
the last two octets of the message.
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12-10
N side C side
4
SRU
3
SHDSL
Segment
SHDSL Span
N = "Network facing", C = "Customer facing"
Alcatel-Lucent - Proprietary
See notice on first page
N side C side
3
SRU
4
SHDSL
Segment Segment
N side
NTU
2
SHDSL
365-312-801R7.2
Issue 3, May 2007