參數(shù)資料
型號(hào)： TTSI4K32T
英文描述： 4096-Channel, 32-Highway Time-Slot Interchanger
中文描述： 4096通道，32道時(shí)隙交換器
文件頁(yè)數(shù)： 21/64頁(yè)
文件大?。?/td> 1105K
代理商： TTSI4K32T
Data Sheet
June 2000
TTSI4K32T
4096-Channel, 32-Highway Time-Slot Interchanger
21
Lucent Technologies Inc.
TDM Highway Interface Timing
Virtual and Physical Frames
Figure 10 below shows a virtual frame offset from the physical frame. The FSYNC pulse marks the beginning of
the physical frame, but the TSI can be programmed to interpret the location of time slot 0 at any point in a frame.
Several parameters are available to make up the offset for a virtual frame with various levels of granularity. There
is XTSOFF/RTSOFF for transmit/receive time-slot offsets. This offset can be up to 31 time slots for a 2.048 Mbits/s
highway, 63 time slots for a 4.096 Mbits/s highway, or 127 time slots for an 8.192 Mbits/s highway. XBITOFF/
RBITOFF allow the setting of up to a 7-bit offset for transmit/receive frames. XFBOFF/RFBOFF allow fractional bit
offsets of 0, 1/4, 1/2, or 3/4 bits. All of these offsets mentioned above can be independently programmed for each
one of the transmit and receive highways. The maximum offset that can be introduced on an 8.192 Mbits/s high-
way is 127 time slots, 7 3/4 bits. The maximum offset on a 4.096 Mbits/s highway is 63 time slots and 7 3/4 bits.
The maximum offset on a 2.048 Mbits/s highway is 31 time slots, 7 3/4 bits.
The following examples indicate how virtual offsets can be used to simplify system designs. For example, data that
is being sent to the TSI on a particular Rx highway may have incurred a several time-slot delay due to processing
by HDLC formatters, echo cancellers, communication protocol processors, etc. Rather than adding an external
buffer to realign all the highway data to the next FSYNC, an offset to create a virtual frame on that Rx highway can
be used instead. On a transmit highway, for example, there may be a device downstream that has a processing
latency of N time slots. An offset of (32 – N) time slots can be added beforehand on a 2.048 Mbits/s highway so
that after processing, the TDM data is aligned to FSYNC again.
Fractional bit offsets are handy for adjusting the sampling point on a Rx highway. With a 1/4-bit resolution possible,
setup and hold time requirements on the Rx TDM highways for the TSI should be easily met. On transmit high-
ways, fractional bit offsets can be used to shift the outgoing highway data slightly, so the destination device’s setup
and hold times can be met with adequate margins. Note that the time slot, bit, and fractional bit offsets are relative
to the highway data rate and imply different durations on different speed highways. For example, a 1/4-bit offset on
a 2.048 Mbits/s highway means 122 ns, on a 4.096 Mbits/s highway, it is 61 ns, and on an 8.192 Mbits/s highway,
it implies a 30.5 ns offset.
5-7464(F)r.2
Figure 10. Virtual and Physical Frames
FSYNC
Rx HIGHWAY
Tx HIGHWAY
PHYSICAL FRAME, N
PHYSICAL FRAME, N + 1
VIRTUAL Rx FRAME, N
VIRTUAL Rx FRAME, N + 1
VIRTUAL Tx FRAME, N
VIRTUAL Tx FRAME, N + 1
Tx OFFSET
Rx OFFSET
相關(guān)PDF資料
PDF描述
TTSI4K32T3BAL 4096-Channel, 32-Highway Time-Slot Interchanger
TTSI4K32T 4096-Channel, 32-Highway Time-Slot Interchanger(4096通道、32路干線時(shí)隙交換機(jī))
TU24C04 CMOS I2C 2-WIRE BUS 4K ELECTRICALLY ERASABLE PROGRAMMABLE ROM 512 X 8 BIT EEPROM
TU24C04BP CMOS I2C 2-WIRE BUS 4K ELECTRICALLY ERASABLE PROGRAMMABLE ROM 512 X 8 BIT EEPROM
TU24C04BP3 CMOS I2C 2-WIRE BUS 4K ELECTRICALLY ERASABLE PROGRAMMABLE ROM 512 X 8 BIT EEPROM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TTSI4K32T3BAL 制造商:AGERE 制造商全稱:AGERE 功能描述:4096-Channel, 32-Highway Time-Slot Interchanger
TTSL-1 功能描述:電線鑒定 THERM. TRANS. SELFLAM LABEL RoHS:否 制造商:TE Connectivity / Q-Cees 產(chǎn)品:Labels and Signs 類型: 材料:Vinyl 顏色:Blue 寬度:0.625 in 長(zhǎng)度:1 in
TTSL10VC3-5 功能描述:電線鑒定 ThermTrans, Self-Lam Label, Vinyl, .50" RoHS:否 制造商:TE Connectivity / Q-Cees 產(chǎn)品:Labels and Signs 類型: 材料:Vinyl 顏色:Blue 寬度:0.625 in 長(zhǎng)度:1 in
TTSL126VC3-1 功能描述:電線鑒定 1.0" X 7.44" THERMAL RoHS:否 制造商:TE Connectivity / Q-Cees 產(chǎn)品:Labels and Signs 類型: 材料:Vinyl 顏色:Blue 寬度:0.625 in 長(zhǎng)度:1 in
TTSL-13 功能描述:電線鑒定 ThermTrans, Self-Lam Label, Vinyl, 1.00" RoHS:否 制造商:TE Connectivity / Q-Cees 產(chǎn)品:Labels and Signs 類型: 材料:Vinyl 顏色:Blue 寬度:0.625 in 長(zhǎng)度:1 in
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