TXC-03305AIPQ Transwitch Corporation, TXC-03305AIPQ Datasheet - Page 83

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

Specifications of TXC-03305AIPQ

• Lead Free Status / RoHS Status: Not Compliant

Address
21
7-5
Bit
4
3
2
Reserved
Symbol
R3AIS2
R3AIS1
R3AIS0
Reserved: These bits should always be written with a 0.
Receive DS3 AIS Selection: A DS3 AIS may be detected with any one of
five different criteria. These three bits select the DS3 AIS detection mecha-
nism that is used for providing an R3AIS alarm, as shown in the table below.
The C-bits = 0 and X bits = 1 conditions are detected as explained for bits 6
and 7 of Address 24H. The other detection conditions are described below.
R3AIS(2-0) set to 000, 001, and 010 respectively:
The framed 1010 pattern detection consists of looking for the 1010 pattern
on a per DS3 subframe basis and monitoring for errors in 4-bit groups of the
1010 pattern. The 1010 pattern is accepted as valid if the M13X receives 4
or fewer errored 4-bit groups of the 1010 pattern per DS3 subframe and the
1010 pattern starts with a 1 after each DS3 overhead bit.
R3AIS(2-0) set to 100:
For the unframed 1010 pattern detection the M13X looks for 1010 pattern
and declares R3AIS if it receives 2 or fewer errored 4-bit groups of the 1010
pattern per DS3 subframe. The M13X will exit the R3AIS state if it receives
5 or more errored 4-bit groups of the 1010 pattern per DS3 subframe. If 3 -
4 4-bit groups of the 1010 pattern are errored per DS3 subframe the M13X
will exit and reenter the R3AIS state.
R3AIS(2-0) set to 101:
The unframed 1111 pattern detection consists of looking for the 1111 pat-
tern and monitoring for errors in 4-bit groups of the 1111 pattern. The 1111
pattern is accepted as valid if the M13X receives 4 or fewer errored 4-bit
groups of the 1111 pattern out of a total of 168 4-bit groups.
R3AIS2
0
0
0
0
1
1
1
R3AIS1
DATA SHEET
- 83 -
0
0
1
1
0
0
1
R3AIS0 Receive DS3 AIS Selection Criterion
X
0
1
0
1
0
1
Description
Framed 1010 pattern
C-bits = 0
X-bits disregarded
Framed 1010 pattern
C-bits = 0
X-bits = 1
Framed 1010 pattern
C-bits disregarded
X-bits disregarded
Undefined - Do not use
Unframed 1010 pattern
Unframed all ones pattern
Undefined - Do not use
Ed. 4, September 2000
TXC-03305
TXC-03305-MB
M13X