參數(shù)資料
型號： TMUX03155
英文描述： TMUX03155 STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer
中文描述： TMUX03155 STS-3/STM-1（非盟- 4）復(fù)用器/解復(fù)用器
文件頁數(shù)： 44/120頁
文件大?。?/td> 1542K
代理商： TMUX03155
44
Agere Systems Inc.
Data Sheet
April 2001
TMUX03155 STS-3/STM-1 (AU-4) Multiplexer/Demultiplexer
Maintenance Functions
(continued)
Receive Functions
(continued)
Receive Transport Overhead Access Channel (RTOAC)
A TOAC is provided on-chip to drop the TOH portion of the incoming SDH or SONET frame. The TOAC channel
consists of the following signals:
1. 5.184 MHz clock signal, sourced by the device (
RTOACCLKO, RTOAC_CLKINV
).
2. A 5.184 Mbits/s data signal, sourced by the device (
RTOACDATAO
).
3. An 8 kHz synchronization signal, sourced by the device. The sync signal is normally low; during the last clock
period of each frame coincident with the least significant bit of the eighty-first byte or coincident with the least
significant bit of the first byte, the sync signal can go high (
RTOACS_A1orEND, 0x4F
).
An inhibit signal is provided through the control interface to place the clock, data, and sync signal into a high-
impedance state (
RTOACINH, 0x4F
).
The data signal is partitioned into frames of 81 bytes. The frame repetition rate is 8 kHz. Each byte consists of
8 bits that are transmitted/received most significant bit first. The MSB of the first byte of each frame contains an
odd/even parity bit over the 648 bits of the previous frame. The remaining 7 bits of this byte are not specified.
Bytes shown in Table 19 summarize the access capabilities of the receive TOAC. Bytes indicated in bold type are
not specified in the standard, but are labeled here for clarity.
OH Parity
Even or odd parity can be inserted into the first bit of the MSB byte (
RTOAC_OEPINS, 0x4F
) of the TOAC outgo-
ing frame.
Table 19. Transport Overhead Byte Access—Receive Direction
OH Pty
B1
D1
H1-1
B2-1
D4
D7
D10
S1
A1-2
B1-2
D1-2
H1-2
B2-2
D4-2
D7-2
D10-2
Z1-2
A1-3
B1-3
D1-3
H1-3
B2-3
D4-3
D7-3
D10-3
Z1-3
A2-1
E1
D2
H2
K1
D5
D8
D11
Z2-1
A2-2
E1-2
D2-2
H2-2
K1-2
D5-2
D8-2
D11-2
Z2-2
A2-3
E1-3
D2-3
H2-3
K1-3
D5-3
D8-3
D11-3
M1
J0
F1
D3
H3
K2
D6
D9
D12
E2
Z0-2
F1-2
D3-2
H3-2
K2-2
D6-2
D9-2
D12-2
E2-2
Z0-3
F1-3
D3-3
H3-3
K2-3
D6-3
D9-3
D12-3
E2-3
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