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Advance Data Sheet
T7633 Dual T1/E1 3.3 V Short-Haul Terminator
May 1998
188
Lucent Technologies Inc.
Framer Register Architecture
(continued)
Framer Parameter/Control Registers
(continued)
Automatic AIS to the System and Automatic Loopback Enable Register
The default value of this register is 00 (hex).
Table 146. Automatic AIS to the System and Automatic Loopback Enable Register (FRM_PR19) (673; C73)
Transmit Test Pattern to the Line Enable Register
1
This register enables the transmit framer to transmit various test signals to the line interface. The default value of
this register is 00 (hex). Note that between enabling the transmission of line loopback on and off codes this register
must be set to 00 (hex) (i.e., to enable transmission of line loopback on code and then off code, write into this reg-
ister 10 (hex), then 00 (hex), and finally 20 (hex)).
Table 147. Transmit Test Pattern to the Line Enable Register (FRM_PR20) (674; C74
)
1. To transmit test signals using this register, registers FRM_PR69 and FRM_PR70 must be set to 00 (hex).
Bit
0
Symbol
ASAIS
Description
Automatic System AIS.
A 1 transmits AIS to the system whenever the receive framer is
in the loss of receive frame alignment (RLFA) state.
Automatic System AIS CEPT CRC-4 Timer Expiration.
A 1 transmits AIS to the sys-
tem after the CRC-4 100 ms or 400 ms timer expires. AIS is transmitted for the duration
of the loss of CRC-4 multiframe alignment state.
Reserved.
Set to 0.
Transmit System AIS.
A 1 transmits AIS to the system.
Automatic Line Loopback Enable.
A 1 enables the framer section to execute the DS1
line loopback on or off commands without system intervention.
Reserved.
Set to 0.
Automatic FDL Line Loopback Enable.
A 1 enables the framer section to execute a
line ESF FDL loopback on or off command without system intervention.
Automatic FDL Payload Loopback Enable.
A 1 enables the framer section to execute
a payload ESF FDL loopback on or off command without system intervention.
1
ASAISTMX
2
3
4
—
TSAIS
ALLBE
5
6
—
AFDLLBE
7
AFDPLBE
Bit
0
1
Symbol
TUFAIS
TUFAUXP
Description
Unframed AIS to Line Interface (All Ones Pattern).
Unframed AUXP to Line Interface in CEPT Mode (Alternating 010101 Unframed
Pattern).
Transmit Pseudorandom Signal to Line Interface (2
15
– 1).
Transmit Quasi-Random Signal to Line Interface (2
20
– 1) (ANSI T1.403).
Transmit Framed Payload Line Loopback On Code: 00001.
Transmit Framed Payload Line Loopback Off Code: 001.
Transmit Line Idle Code of FRM_PR22.
When this bit = 1, the line idle code of
FRM_PR22 is transmitted to the line in all time slots.
Transmit Inverted CRC.
2
3
4
5
6
TPRS
TQRS
TLLBON
TLLBOFF
TLIC
7
TICRC