S-Access ETHERLINK IV Technical Description And Operations Manual
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DT Etherlink IV User Manual- 23 -Figure. 3.11 Automatic configuration 2x E1 and Ethernet are transmitted over two SHDSL link.3.2.2.2 E1 Interface (G.703/704)3.2.2.2.1 Framed and Unframed E1The Etherlink_IV product family supports transmission of framed and unframed E1 interfaces.In unframed (transparent) mode, the E1 data is transmitted over the SHDSL without any changes.In framed mode (framing according to ITU-T G.704), the E1 data is processed by the onboard E1framer. In this case, 1-32 timeslots per E1 stream can be transmitted over the SHDSL line.3.2.2.2.2 CRC4 (Cyclic Redundancy Check)The CRC4 mode enables the error performance monitoring of the E1 network interface with the helpof a cyclic redundancy check.If the mode is enabled, the modem synchronizes with CRC4 sub-multiframes at the E1 output anddisplays information about CRC errors. In this case the modem regenerates E1 CRC4 sub-multiframes and checksum words in the outgoing E1 stream.If the mode is disabled, the modem transmits transparently CRC4 sub-multiframes and checksumwords if the generation of the zero time slot is not activated. If the TS0GEN mode is activated, thezero time slot is generated without CRC4 sub-multiframes and checksum words.3.2.2.2.3 AIS Generation (Alarm Indication Signal)If this mode is enabled, AIS will be transmitted to the E1 side under the following conditions: the loss of the line signal from the remote device or loss of frame alignment on the DSL side the remote device receives an AIS over E1 interface, which is configured to transmit data fromE1 to DSL. This mode is enabled only if the AIS detection mode is enabled on the remotedevice (see below). If multiple E1 streams are transmitted the AIS generation and detectionare independent per E1 stream.WARNINGIF THE AIS GENERATION MODE IS DISABLED, THE SIGNAL AT THEOUTPUT OF THE E1 INTERFACE WILL BE ABSENT WHEN LOSINGCOMMUNICATION IN THE DSL LINE (EXCEPT FOR TIME SLOTS OF THISINTERFACE DEDICATED TO CARRY ETHERNET DATA)IF SOME TIMESLOTS OF AN E1 INTERFACE ARE USED TO TRANSMITETHERNET DATA, AIS WILL NOT BE GENERATED FOR THIS INTERFACE. |
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