S-Access ETHERLINK IV, Technical Description And Operations Manual

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DT Etherlink IV User Manual
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DSL1 DSL2 DSL1 DSL2 DSL3 DSL1 DSL2 DSL3 DSL4
1 2 1 2 3 1 2 3 4
1 Down 1 2 Down 1 2 3 Down
Down 1 1 Down 2 1 2 Down 3
1 Down Down Down 2 Down Down
Down 2 1 1 Down 3 2
Down 1 Down 1 Down 2 Down
Down Down 1 1 Down Down 2
1 Down Down Down
Down 2 3 1
Down 2 1 Down
Down 2 Down 1
Down 1 Down Down
Down Down 2 1
Down Down 1 Down
Down Down Down 1
Table 3.8 Examples of reservation of systems with two, three and four SHDSL channels
3.2.2.1.4 Automatic Configuration of a Link
S-Access Etherlink_IV devices support to configure the complete link in accordance with the Master-
Modem configuration. This mode is available for the following links:

Point-to-Point single-channel or multipair links

Point-to-Point multi-channel links with independent channels

Star-topology multichannel links

Point-to-Point two-channel two-pair links

Star-topology two-pair links

Links with regenerators
Note: Automatic configuration of link reservation is not supported.
When the automatic configuration is used, the Slave-Modems and Regenerators receive nearly all
configuration parameters for DSL and all other interfaces (like E1) through the link from the Master-
Modem. In a majority of cases they require just a minimum configuration, what helps not to duplicate
manually the configurations to all other devices in the link. Configurations like the number of
transmitted E1 timeslots over DSL, CRC4 and E1 (G703/4) modes do not have to be configured on
all devices because they are received automatically through the link.
The system of automatic configuration operates the following way:

The CP side (Slave) automatically adjusts configuration according to the stream structure
received from the CO side (Master), not to cause permanent losses of user data.

If the CP side (Slave) cannot adjust correspondingly, it displays a RCONF alarm and sends a
message to the remote terminal device (Master). If configurations of terminal devices (Master
and Slave) do not coincide, the RCONF alarm is displayed. RCONF means a remote urgent
alarm.
The link is adjusted in the channel structure in the direction from the Master- to the Slave-Modem:

The stream structure is configured on the Master-Modem device.

If there is any Regenerator in the link, it receives this structure and configures itself according
to it.

Also a next Regenerator receives the structure from the previous Regenerator and performs
configuration according to it.