2. Basic Transmission Rules

The basic transmission rules are quite simple. The basic SONET OC-1 frame is replaced with the corresponding sonnet at the transmission end converted back from the sonnet to SONET at the receiving end. Thus, for example, SONET frame 12 is transmitted as:

        When do I count the clock that tells the time
        And see the brave day sunk in hideous night;
        When I behold the violet past prime,
        And sable curls,...

For rates higher than OC-1, the OC-1 frames may either come interleaved or concatenated into larger frames. Under SONNET conversion rules, interleaved frames have their corresponding sonnet representations interleaved. Thus SONET frames 33, 29 and 138 in an OC-3 frame would be converted to the sequence:

        Full many a glorious morning have I seen
        When, in disgrace with fortune and men's eyes,
        When my loves swears that she is made of truth
        Flatter the mountain-tops with sovereign eye
        I all alone beweep my outcast state,
        I do believe her, though I know she lies
        Kissing with golden face...

while in an OC-3c frame, the individual OC-1 frames concatenated, one after another, viz.:

        Full many a glorious morning have I seen Flatter the mountain-
        tops with sovereign eye Kissing with golden face...

        When, in disgrace with fortune and men's eyes, I all alone
        beweep my outcast state,...

        When my loves swears that she is made of truth I do believe her,
        though I know she lies...

(This example, perhaps, makes clear why data communications experts consider concatenated SONET more efficient and esthetically pleasing).