DT Etherlink IV
User Manual
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Table 3.4 Line settings per SHDSL interface, single pair
3.2.2.1.1 Master/Slave
To establish a connection, it is necessary that one transceiver side is configured as Master and the
other as Slave. In this case, the connection is controlled by the Master device.
3.2.2.1.2 Multipair Mode
If 2, 3 or 4 SHDSL channels are configured to operate in the multipair mode, they work at the same
clock frequency and line rate like one SHDSL channel with doubled, tripled or quadrupled
transmission capacity. Similarly to the independent channel, such a combined channel can
simultaneously transmit one or several E1 streams and one WAN stream. This transmission is also
plesiochronous. All E1 streams that are transmitted over one SHDSL interface should use the same
clock frequency per direction.
In multipair mode, one SHDSL channel serves as a
“master” channel, while the other SHDSL
channels serve as
“slave” channels. If the link in one channel fails, links in all other channels break
too and the procedure of connection/activation restarts.
The four-channel modems provide a possibility to organize pair-wise channels, i.e., these two two-
pair links will operate independently from each other. The main application for the multipair mode is
the increasing of the transmission range. In this case, some channels operate at low transmission
rates. In multipair mode some limitations are imposed on the Baserate parameter.
Mode
Coding Type
Baserate
Transmission Data Rate Standard
2-pair, Master/Slave
Fix Configuration
PAM16
3..60
2*Baserate*64kbit/s
Annex A, Annex B,
Annex AB (autodetection)
PAM32
12..89
2-pair, Master
Autodetection
PAM16
Auto (3..60)
Annex AB (autodetection)
PAM32
Auto (12..89)
2-pair, Slave
Autodetection
Auto (PAM16/32)
Auto (3..89)
Annex AB (autodetection)
3-pair, Master/Slave
Fix Configuration
PAM16
3..60
3*Baserate*64kbit/s
Annex A, Annex B,
Annex AB (autodetection)
PAM32
12..85
3-pair, Master
Autodetection
PAM16
Auto (3..60)
Annex AB (autodetection)
PAM32
Auto (12..85)
3-pair, Slave
Autodetection
Auto (PAM16/32)
Auto (3..85)
Annex AB (autodetection)
4-pair, Master/Slave
Fix Configuration
PAM16
3..60
4*Baserate*64kbit/s
Annex A, Annex B,
Annex AB (autodetection)
PAM32
12..64
4-pair, Master
Autodetection
PAM16
Auto (3..60)
Annex AB (autodetection)
PAM32
Auto (12..64)
4-pair, Slave
Autodetection
Auto (PAM16/32)
Auto (3..64)
Annex AB (autodetection)
Mode
Coding Type
Baserate
Transmission
Data Rate
Standard
Master/Slave
Fix Configuration
PAM16
3..60
Baserate*
64
kbit/s
Annex A, Annex B,
Annex AB (autodetection)
PAM32
12..89
Master
Autodetection
PAM16
Auto (3..60)
Annex AB (autodetection)
PAM32
Auto (12..89)
Slave
Autodetection
Auto (PAM16/32) Auto (3..89)
Annex AB (autodetection)