发明名称 |
Interface circuit for zero byte substitution for telecommunications equipment |
摘要 |
A method is provided for implementing zero-byte substitution (ZBS) in a channel unit or line card which couples a digital subscriber line, such as a basic or primary rate Integrated Services Digital Network (ISDN) line, to a T1 network or other digital transmission facility. On the transmit side, the occurrence of all-zero data byte in a B channel of the ISDN interface causes a corresponding zero byte indicator (ZBI) flag to be produced in the D+ channel, and also causes the all-zero byte to be replaced by the preceding non-zero data byte rather than by a prescribed or predetermined data byte. On the receive side, the occurrence of a repeated data byte in a B channel is detected and causes the current data byte to be replaced by an all-zero byte to restore the original data. The ZBI flag is then used as an error check bit to verify that the reinsertion of the all-zero byte was correct. <IMAGE> |
申请公布号 |
EP1513306(A3) |
申请公布日期 |
2005.05.25 |
申请号 |
EP20040027024 |
申请日期 |
1996.06.07 |
申请人 |
PULSE COMMUNICATIONS, INC.;TELESEND, INC. |
发明人 |
WISNIEWSKI, JAMES J.;GLAVE, FRED E.;SHARPER, CRAIG A. |
分类号 |
H04L7/00;H04L25/49 |
主分类号 |
H04L7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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