TXC-03303-ARPQ Transwitch Corporation, TXC-03303-ARPQ Datasheet - Page 45

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

Specifications of TXC-03303-ARPQ

• Lead Free Status / RoHS Status: Compliant

Address
21
Bit
4
3
2
Symbol
R3AIS2
R3AIS1
R3AIS0
Receive DS3 AIS Selection: A DS3 AIS may be detected in one of six
ways. The following table selects the DS3 AIS detection mechanism that is
used for providing an R3AIS alarm. Note: The M13E detects all of the AIS
selections in parallel.
The C-Bits = 0 & X bits = 1 conditions are detected as explained for bits 6 &
7 of Address 24H.
R3AIS(2-0) set to 000, 001, & 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 M13E receives 4
or less 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 011
The framed 1111 pattern detection consists of looking for the 1111 pattern
on a per DS3 subframe basis and monitoring for errors in 4-bit groups of the
1111 pattern. The 1111 pattern is accepted as valid if the M13E receives 4
or less errored 4-bit groups of the 1111 pattern per DS3 subframe.
R3AIS(2-0) set to 100
For the unframed 1010 pattern detection the M13E looks for 1010 pattern
and declares R3AIS if it receives 2 or less errored 4-bit groups of the 1010
pattern per DS3 subframe. The M13E 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 M13E
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 M13E receives 4 or less 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
- 45 -
0
0
1
1
0
0
1
2
2
2
:
:
:
R3AIS0 Receive DS3 AIS Selection
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
Framed 1111 pattern
C-bits disregarded
X-bits disregarded
Unframed 1010 pattern
Unframed all ones pattern
Undefined - Do not use
Ed. 4, August 1998
TXC-03303
TXC-03303-MB
M13E