Maxim Integrated DS21Q55 User Manual
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17.2.4 Hardware-Based Transmit Signaling
In hardware-based mode, signaling data is input via the TSIG pin. This signaling PCM stream is buffered
and inserted to the data stream being input at the TSER pin.
Signaling data can be input on a per-channel basis via the transmit-hardware signaling-channel select
(THSCS) function. The framer can be set up to take the signaling data presented at the TSIG pin and
insert the signaling data into the PCM data stream that is being input at the TSER pin. The user has the
ability to control what channels are to have signaling data from the TSIG pin inserted into them on a per-
channel basis. See the Special Per-Channel Operation section. The signaling insertion capabilities of the
framer are available whether the transmit side elastic store is enabled or disabled. If the elastic store is
enabled, the backplane clock (TSYSCLK) can be either 1.544MHz or 2.048MHz.