PURPOSE: To realize a folding in an intra-office of a line concentrator for a remote subscriber in economical way, by providing a folding circuit at an internal highway so as to control the folding with a pattern on an ROM corresponding to the characteristic of a PCM transmission line.
CONSTITUTION: The folding circuit DTIF is provided to the internal highway WH. The output of a folding memory is read out at all times with a delay of, e.g., 16 TS and inputted to the selector of a next stage. The other input of the selector is connected to an outgoing highway DHW from a PCM interface digital truck DT and the switching signal of the selector is controlled with the output of a control ROM. Thus, in writing a data in advance so that an output of a 4-bit word of the ROM generates a prescribed pattern in synchronizing with the TS, the changeover is attained so as the memory output is given to the remote subscriber line concentrator RLC only when the selector receives the folding TS with this data.
NARA TAKASHI
TAKAHASHI ATSUHISA
MORITA YOSHIO
KAKUMA SATORU
| JPS5255412A | 1977-05-06 | |||
| JPS5693497A | 1981-07-29 |