The following options are possible:
• NTU to End-user direction (SDH/SHDSL to PDH):
– Force S-interface or customer interface AIS – enable/disable: This command is
applicable in all modes and forces an all ones AIS pattern on the outgoing E1
interface in the end-user direction.
– Channel AIS conversion – enable/disable: This command is applicable in both
ISDN modes and controls whether a Channel AIS request in Sa6 (“1100”)
received from the LTU direction is converted to an all ones pattern on the E1
output towards the end-user or is transparently passed through as channel AIS.
• NTU to LTU direction (PDH to SDH/SHDSL):
– Force U-interface or network interface AIS – enable/disable: This command is
applicable in all modes and forces an AIS pattern according to the selected
format on the P12 logical interface towards the LTU.
– AIS Signaling Method for ISDN – Channel AIS (“1100”), Channel AIS
(“1000”): This command is applicable in both ISDN modes and controls the sa6
Alarm Code to be used towards the network in case a failure is detected on the
incoming E1 signal from the end-user or when AIS is forced via management.
Channel AIS is defined as an all-ones pattern in TS 1-31 and a valid TS0
(regenerated CRC-4 and E-bits based on signal from network; A-bit set to “0”;
Sa5 set to “1”), with an Sa6 bit-pattern of “1100” or “1000”, whichever is
selected.
– Channel AIS/Full AIS selection – This command is available in both ISDN
modes and determines whether “channel AIS” or “full AIS (all ones)” is sent to
the network during E1 input failures or when AIS is forced by management.
Loopback Control
For maintenance operations, the user has the option to activate and release loopbacks
via the management systems on the following interfaces:
• LTU: Supports an SHDSL outloop
• SRU: Supports an SHDSL outloop (loop on the customer side of the SRU)
• E1 NTU in E1 mode (E1 over SHDSL): Supports an SHDSL outloop (on the
SHDSL side of the E1 NTU) and supports an outloop on the customer interface (on
the E1 side of the modem)
• E1 NTU (NT2M) in TU12 mode (TU12 over SHDSL): Supports an outloop on the
customer interface (on the E1 side of the TU12 mode E1 NTU)
• Ethernet NTU (NT10ETH): Supports an inloop on the Ethernet NTU (on the
SHDSL side of the Ethernet NTU)
SSM messaging
An NT2M modem has two functions for which a synchronization reference signal is
necessary:
• Supplying a 2048 kHz timing output signal (according to G.703-13), 120W
symmetrical.
• Retiming the outgoing 2048 kbit/s E1 signal towards the end-user.
SHDSL Overview
SHDSL features
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12-16
Alcatel-Lucent - Proprietary
See notice on first page
365-312-801R7.2
Issue 3, May 2007
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