ZyXEL Communications MSC1000G Series, Руководство пользователя

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Chapter 9 Subscriber Port Setup Screens
Management Switch Card User’s Guide
254
Stuc Alarm Profile Select an alarm profile to define the thresholds that trigger an alarm on the port when
exceeded. This alarm profile is for the STU-C (SHDSL Termination Unit - Central) end
point.
Stur Alarm Profile Select an alarm profile to define the thresholds that trigger an alarm on the port when
exceeded. This alarm profile is for the STU-R (SHDSL Termination Unit - Remote) end
point.
Mode
Select the SHDSL mode for the selected SHDSL port(s). PAM 32 is more efficient and can
deliver higher data rates over short distances.
auto : automatically switch the mode (to pam16 or pam32) depending on the line
condition.
pam16 : Pulse Amplitude Modulation 16 line coding
pam32 : Pulse Amplitude Modulation 32 line coding
Customer Info Enter information to identify the subscriber connected to this ADSL port. You can use up
to 31 printable English keyboard characters (including spaces and hyphens).
TEL Enter information to identify the telephone number of the subscriber connected to this
ADSL port. You can use up to 15 English keyboard characters (including spaces and
hyphens).
Transmission
Convergence IEEE 802.3-2004’s EFM (Ethernet First Mile) lets you run Ethernet protocol over G.SHDSL.
EFM framing has less overhead than ATM encapsulation, thus allowing better data
transmission rates.
If the CPE device supports EFM, select efm to use Ethernet frames over SHDSL. For ports
set to EFM mode you can use PAF (Physical Aggregation Function) for 4, 6, or 8 wire
channel bundling of EFM PHYs to either increase the data rate of one logical EFM link for a
given loop length or increase the maximum achievable loop length for a given data rate.
Configure PAF EFM bundling in the G.bond settings (see
Section 9.21 on page 279 ).
If the CPE device only supports ATM, select atm to use ATM cells over SHDSL. For ports
set to ATM mode, you can use G.bond to create bundles of up to 16 wires (see Section
9.21 on page 279 ).
SHDSL Feature
Power Backoff This command sets the power backoff feature setting on the SHDSL port. Power backoff
calculates how much power is needed for the connection. This allows the STU-C and STU-
R to use only enough power for the port’s maximum transmission rate (configured in the
SHDSL profile). You can normally just leave the default setting (
NORMAL_EPL ), you only
need to use this command if the STU-R does not support EPL or you need to configure the
port to use a specific power backoff setting.
Select NORMAL_EPL to use power backoff with EPL (Estimated Power Loss). Each end
calculates an EPL and uses it in determining a power backoff value for the other end to
use.
Select FORCED_EPL to use forced power backoff with EPL. The STU-C calculates an EPL
and uses it in determining the power backoff values for both ends. This can be used when
the STU-R device does not support EPL.
Select FORCED_NO_EPL to use forced power backoff without EPL. The STU-C uses the
value you specify in determining the power backoff values for both ends. This can be used
when you have prior knowledge about the physical line (loop).
Set the power backoff value (0~31 in dBm).
When using NORMAL_EPL or FORCED_EPL , this sets the maximum power backoff
value.
When using FORCED_NO_EPL , this sets the power backoff value.
Table 113
SHDSL Port Setup: Advanced Features (continued)
LABEL DESCRIPTION