0-9 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
The generic designator for any of several digitally multiplexed telecommunications carrier systems. Note 1: The designators for T-carrier in the North American digital hierarchy correspond to the designators for the digital signal (DS) level hierarchy. See the table on the following page. Note 2: T-carrier systems were originally designed to transmit digitized voice signals. Current applications also include digital data transmission. (188) Note 3: If an "F" precedes the "T", a fiber optic cable system is indicated at the same rates. Note 4: The table below lists the designators and rates for current T-Carrier systems. Note 5: The North American and Japanese hierarchies are based on multiplexing 24 voice-frequency channels and multiples thereof, whereas the European hierarchy is based on multiplexing 30 voice-ifrequency channels and multiples thereof. See table below.
T-Carrier Systems | North American | Japanese | European (CEPT) | Level zero (Channel data rate) | 64 kb/s (DS0) | 64 kb/s | 64 kb/s | First level | 1.544 Mb/s (DS1) (24 user channels) | 1.544 Mb/s (24 user channels) | 2.048 Mb/s (30 user channels) | (Intermediate level, North American Hierarchy only) | 3.152 Mb/s (DS1C) (48 Ch.) | - | - | Second level | 6.312 Mb/s (DS2) (96 Ch.) | 6.312 Mb/s (96 Ch.), or 7.786 Mb/s (120 Ch.) | 8.448 Mb/s (120 Ch.) | Third level | 44.736 Mb/s (DS3) (672 Ch.) | 32.064 Mb/s (480 Ch.) | 34.368 Mb/s (480 Ch.) | Fourth level | 274.176 Mb/s (DS4) (4032 Ch.) | 97.728 Mb/s (1440 Ch.) | 139.268 Mb/s (1920 Ch.) | Fifth level | 400.352 Mb/s (5760 Ch.) | 565.148 Mb/s (7680 Ch.) | 565.148 Mb/s (7680 Ch.) |
---|