參數(shù)資料
型號: XRT86VL3x
廠商: Exar Corporation
元件分類: 通信及網(wǎng)絡(luò)
英文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
中文描述: Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
文件頁數(shù): 18/153頁
文件大?。?/td> 1316K
代理商: XRT86VL3X
XRT86VL3X
11
T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
REV. 1.2.2
1.9
Robbed Bit Signaling/CAS Signaling
Signaling is used to convey status information relative to the individual DS-0’s. If a particular DS-0 is On Hook,
Off Hook, etc. this information is carried within the robbed bits in T1 (SF/ESF/SLC-96) or the sixteenth time slot
in E1. On the transmit path, the Signaling information can be inserted through the PCM data, internal registers,
or a dedicated external Signaling Bus by programming the appropriate registers. On the receive path, the
signaling information is extracted (if enabled) to the internal registers and the external signaling bus in addition
to being embedded within the PCM data. If the user wishes to substitute the ABCD values, the substitution
only occurs in the PCM data. Once substituted, the internal registers and the external signaling bus will not be
affected.
Figure 11
is a simplified block diagram showing the Signaling Interface.
Figure 12
is a timing
diagram showing how to insert the ABCD values for each time slot in ESF / CAS.
Figure 13
is a timing
diagram showing how to insert the AB values for SF / SLC-96 or 4-code signaling in ESF / CAS.
F
IGURE
11. R
OBBED
B
IT
S
IGNALING
/ CAS S
IGNALING
F
IGURE
12. ESF / CAS E
XTERNAL
S
IGNALING
B
US
RBS/CAS
Signaling
Substitution
PCM Data
Tx LIU
TSCR
Internal Reg 's
Rx LIU
Signaling
Extraction
PCM Data
RSAR
Internal Reg 's
Transmit Direction
Receive Direction
TxSER
TxCHN 0/
TxSIG
RxSER
RxCHN 0/
RxSIG
Physical
Interface
TxSYNC
TxMSYNC
TxSERclk
TxCHN0/TxSIG
TxSER
F
D
C
B
A
TS 1
D
C
B
A
D
C
B
A
TS 2
TS 3
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