Transparent Operation on T1, E1 Framers and Transceivers
Abstract: The Dallas Semiconductor framers can operate in a transparent mode in both the receive and transmit directions. The transmitter will not insert framing, signaling, or other information such as CRC or FDL. Generally, the receive side of the framers is always transparent. Data received at RTIP and RRING is passed through intact to RSER. All configurations are with the elastic stores disabled. The elastic stores will not alter data except during slip conditions or if configured for 1.544MHz/2.048MHz conversion or signaling reinsertion.
Introduction
This application note applies to the following products.
T1 Framers
E1 Framers
T1/E1/J1 Framers
T1 SCTs
E1 SCTs
T1/E1 SCTs
DS21Q41
DS21Q43
DS26401
DS2151
DS2153
DS2155
DS21Q42
DS21Q44
DS2152
DS2154
DS21Q55
DS21FF42
DS21FF44
DS21352
DS21354
DS2156
DS21FT42
DS21FT44
DS21552
DS21554
DS21455
DS21Q352
DS21Q354
DS21458
DS21Q552
DS21Q554
DS26521
DS2150
DS26524
DS21Q50
DS26528
The Dallas Semiconductor framers can operate in a transparent mode in both the receive and transmit directions. The transmitter will not insert framing, signaling, or other information such as CRC or FDL. Generally, the receive side of the framers is always transparent. Data received at RTIP and RRING is passed through intact to RSER. All configurations are with the elastic stores disabled. The elastic stores will not alter data except during slip conditions or if configured for 1.544MHz/2.048MHz conversion or signaling reinsertion.
Transparent Operation on DS21Q42, DS21FF42, DS21FT42, DS21352, DS21552, DS21Q352, DS21Q552
In order to get transparent mode working on the devices DS26401, DS26521, DS26524 and DS26528, the customer should never set the RMMR and TMMR INIT_DONE bits to 1. Doing so will cause the framer to search for the framing pattern.
If you have further questions about transparent operation on Dallas Semiconductor framers or SCTs, contact the Telecommunications Applications Support Team via email at
or call 972-371-6555.