TXC-03303AIPQ Transwitch Corporation, TXC-03303AIPQ Datasheet - Page 36

• Manufacturer Part Number: TXC-03303AIPQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-03303AIPQ

• Lead Free Status / RoHS Status: Not Compliant

*Note: 1 CON/DIS is not used when LBSEL = 0. Instead, bit 7 (EXEC) is used when LBSEL = 0 to send (EXEC=1) or stop
Address
Note: 2 If this register is used to send a remote loopback request using the double word FEAC message then the
07
sending (EXEC=0) a remote loopback request via the C or stuff bit inversions defined by register 20H bits 3-0. If
a loopback request for a different channel is sent via register 07H (that uses C or stuff bit inversion), the current
loopback request is taken down. i.e., multiple loopback requests can not be transmitted simultaneously.
C3CLKI bit in register 19 Hex must be set to a 1.
Bit
7
6
5
4
3
2
1
0
CON/DIS
Symbol
LBSEL
EXEC
D22
D21
D20
D11
D10
Remote Loopback: The bits in this location are used to send a DS1
remote loopback request in the M13 mode, or a DS3/DS1 remote loopback
request in the C-bit parity mode. Bit 7 (EXEC) executes the command. Bit 6
(CON/DIS)* selects the command to connect or disconnect the loopback
selected. When in C-bit parity mode bit 5 (LBSEL) selects either C or stuff
bit inversions, defined by the 1LBVn bits in register 20H or a double FEAC
message (in C-bit parity mode only) when sending a loopback request. The
C or stuff bit inversion mechanism in the M13 (or C-bit parity) mode is
selected by the states written to the four 1LBVn bits in register 20H. Bits 4
(D22), 3 (D21), and 2 (D20) select the DS2 channels (1-7). Bits 1 (D11)
and 0 (D10) select one of four DS1 channels. In the C-Parity mode, the
FEAC channel (C3) can be used for sending DS1 and DS3 remote loop-
back requests. The channel to be looped is written into bits 4-0. The M13E
translates this code into the FEAC codeword. To send a loopback request
using the FEAC channel, the M13E sends 10 repetitions of the FEAC line
activator code sequence (0 000111 0 11111111) followed immediately by
10 repetitions of the loopback codeword (0 xxxxxx 0 11111111). At the end
of this sequence (20 codewords or 320 DS3 frames), completion is indi-
cated by bit 7 (EXEC) resetting to zero. To deactivate a loopback using the
FEAC channel, the M13E sends 10 repetitions of the deactivate code fol-
lowed immediately by 10 repetitions of the channel selected. Only one
loopback request can be sent at a time. The codes for sending and deac-
tivating a remote loopback request are shown below:
For CON/DIS, Connect = 1, Disconnect = 0
For X, 1 = FEAC (C-bit parity mode only), 0 = C or stuff bit inversion
Channel
All
Channel 1
Channel 2
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Channel 28
DS3
Bits
EXEC CON/DIS LBSEL D22
7
1
1
1
1
1
- 36 -
1 or 0
1 or 0
1 or 0
1 or 0
1 or 0
6
Description
X
X
X
X
5
1
- - - - - - - - - - - - - - - - - - - - - - - - - - -
4
0
0
0
1
0
D21
3
0
0
0
1
0
D20
2
0
1
1
1
0
Ed. 4, August 1998
TXC-03303
D11
TXC-03303-MB
1
0
0
0
1
1
M13E
D10
0
0
0
1
1
0