TXC-03305AIPQ Transwitch Corporation, TXC-03305AIPQ Datasheet - Page 73

• Manufacturer Part Number: TXC-03305AIPQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-03305AIPQ

• Lead Free Status / RoHS Status: Not Compliant

Notes:
1. If this register is used to send a remote loopback request using the double word FEAC message then the C3CLKI bit in
2. CON/DIS is not used when LBSEL = 0. Instead, bit 7 (EXEC) is used when LBSEL = 0 to send (EXEC = 1) or stop
Address
register 19 Hex must be set to a 1.
sending (EXEC = 0) a remote loopback request via the DS2 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 DS2 C or stuff bit inversion), the current
transmitted loopback request is taken down. i.e. only single loopback requests can be sent one at a time unless the “all”
loopback request command is used. When the “all” loopback request command is used, loopback requests for all
channels are simultaneously transmitted.
07
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 format mode, or a DS3/DS1 remote
loopback request in the C-bit parity mode (See Note 1). Bit 7 (EXEC) exe-
cutes the command. Bit 6 (CON/DIS, see Note 2) selects the command to
connect or disconnect the loopback selected. When in C-bit parity mode bit
5 (LBSEL) selects either DS2 C or stuff bit inversions, defined by the four
1LBVn bits in register 20H or a double FEAC message (in C-bit parity mode
only) when sending a loopback request. The DS2 C or stuff bit inversion
mechanism in the M13 (or C-bit parity) format 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-bit Parity mode, the FEAC channel (C3)
can be used for sending DS1 and DS3 remote loopback requests. The
channel to be looped is written into bits 4-0. The M13X translates this code
into the FEAC codeword. To send a loopback request using the FEAC
channel, the M13X 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 indicated by bit 7 (EXEC)
resetting to 0. To deactivate a loopback using the FEAC channel, the M13X
sends 10 repetitions of the deactivate code followed immediately by 10 rep-
etitions of the channel selected. The codes for sending and deactivating a
remote loopback request are shown below:
Notes:
For CON/DIS, Connect = 1, Disconnect = 0
For X, 1 = FEAC (C-bit parity mode only), 0 = DS2 C or stuff bit inversion
Channel
All
Channel 1
Channel 2
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Channel 28
DS3
Bits
EXEC CON/DIS LBSEL D22 D21 D20
DATA SHEET
7
1
1
1
1
1
- 73 -
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
3
0
0
0
1
0
2
0
1
1
1
0
Ed. 4, September 2000
TXC-03305
D11
TXC-03305-MB
1
0
0
0
1
1
M13X
D10
0
0
0
1
1
0