55..77 E4 Setup and StatusE4 Setup and Status
E4 represents the 139.264 Mbit/s PDH layer. The Ports SetupPorts Setup screen gives you
access to the PDH layer setup for the transmitter and/or receiver of the
currently selected port.
E4 allows transmission of data streams that are nominally running at the same rate,
however allowing for some variation in the speed around a nominal rate (±125 ppm
variation around 139.264 Mbit/s).
E4 frame has 2988 bits consisted 6 sets of 488 bits. FAS (Frame Alignment Signal)
bits are located at top of E4 frame.
E4 Frame StructureE4 Frame Structure
The E4 interface uses the electrical BNC connectors.
55..77..11 Transmitter SetupTransmitter Setup
55..77..11..11 Physical SetupPhysical Setup
When the transmitter is set up with only an E4 interface, selecting the TxTx button
in the navigation area will launch the following screen.
For the switching method between PDH Tx and DSn Tx, refer to Physical Setup
in "E1 Setup and Status". Touch E4E4 radio button. Touching OffOff radio button
disables the transmitter.
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