Technical Description and Installation Manual
GigaFlex
12
•
Normal Mode: only TC-PAM16 and TC-PAM32 modulations are supported.
•
Extended Mode: offers all modulations from TC-PAM4 to TC-PAM128; extends maximum
possible data rates for TC-PAM16 and TC-PAM32 modulations.
3.3.1.2 SHDSL Annex A/B
The GigaFlex models support two PSD (Power Spectral Density) operation modes: Annex A and
Annex B. The Annex A is designed for the use in North America and has less impact on ADSL
systems if they work over neighbor pairs in the same cable. The output signal level is 13.5dBm
@ 135Ohm. The Annex B is designed for the use in Europe. The output signal level is 14.5dBm
@ 135Ohm.
3.3.1.3 Bonding Group
The GigaFlex models support up to two bonding groups. Any two from four SHDSL channels can
create
bonding group 1
, while other two channels can create
bonding group 2
. Three or
four independent channels can be added into bonding group as well. If bonding is not required,
four independent channels can work into four independent directions.
3.3.1.4 Master and Slave Mode
An SHDSL link can be created if two transceivers on it ends operate in different modes. It is
required that one transceiver is configured as Master and the other one as Slave. The GigaFlex
models can have up to four SHDSL transceivers. They all work independently and must be
configured separately. The available SHDSL settings are dependent on the Master/Slave
transceiver operation mode.
Parameter
Values for Master
Values for Slave
Bonding Group*
1, 2, no
1, 2, no
Master / Slave*
Master
Slave
Extended
disable, enable
disable, enable
PAM
If Extended disabled:
•
16, 32
If Extended enabled:
•
4, 8, 16, 32, 64, 128
auto
Baserate
If Extended off:
•
… 0 for PAM
•
… 89 for PAM32
•
auto
If Extended on:
•
… 238
auto
Annex
A, B
auto
*)
All channels in one bonding group must be configured in the same way: either as a Master or as a Slave.
Table 3-4. Possible values for SHDSL-transceiver configuration parameters.
3.3.1.5 Topologies
3.3.1.5.1 Point-to-Point
A point-to-point connection is a direct connection between two devices. This can be realized with
just one or up to four copper pairs.
Figure 3-4. Point-to-point connection
1
…4 pairs
ETH
ETH
