tmxf28155 ETC-unknow, tmxf28155 Datasheet - Page 486

• Manufacturer Part Number: tmxf28155
• Description: Tmxf28155 Super Mapper 155/51 Mbits/s Sonet/sdh X28/x21 Ds1/e1
• Manufacturer: ETC-unknow

155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
21 28-Channel Framer Block Functional Description
21.3.3 Transmit Framer Functions
10. In transport mode, when not in frame alignment, to optionally send AIS or transparently pass data.
21.3.4 Framing References/Standards
1. ANSI T1.403, 1997.
2. ITU-T Recommendation G.703, Physical/Electrical Characteristics of Hierarchical Digital Interfaces; 1991.
3. ITU-T Recommendation G.704, Synchronous Frame Structures used at 1554, 6312, 2048, 8488 and
4. ITU-T Recommendation G.706, Frame Alignment and Cyclic Redundancy Check (CRC) Procedures Relating to
5. TTC Standard JT-G704, Synchronous Frame Structures used at 1554, 6312, 2048, 8488 and 44736 kbits/s Hier-
21.4 DS1 Transparent Framing Format
The transmit framer can be programmed to transparently transmit 193 bits of CHI system data to the line.
When configured for transparent framing, the transmit framer extracts from the receive CHI system data bit 8 of
time slot 1 and inserts this bit into the framing bit position of the transmit line data. The other 7 bits of the receive
system time slot 1 are ignored by the transmit framer. The receive framer will extract the framing bit (or 193rd bit) of
the receive line data and insert it into bit 8 of time slot 1 of the CHI system data. The other bits of time slot 1 are set
to 0.
Frame integrity is maintained in both the transmit and receive framer sections.
486
1. Transmits alarm indication signal (AIS) to the line automatically and on demand.
2. Transmits AIS-CI to the line automatically and on demand.
3. Transmits remote alarm indication (RAI) to the line automatically and on demand. Conditions for transmitting
4. Transmits RAI-CI to the line automatically and on demand.
5. Transmits auxiliary test pattern (AUXP) to the line automatically and on demand.
6. Transmits CEPT E bits based received CRC-4 errors.
7. Support the CEPT double not-FAS system mode.
8. Transmits a PRBS test pattern to the line on demand.
9. Transmits line loopback on and off codes to the line on demand (T1.403 section 9.3.1).
44736 kbits/s Hierarchical Levels; July 1995.
Basic Frame Structures defined in Recommendation G.704; 1991.
archical Levels; July 1995.
RAI include; loss of received frame alignment, CEPT loss of received time slot 0 multiframe alignment, CEPT
CRC-4 timer expiration, CEPT loss of received time slot 16 signaling multiframe alignment, CEPT received Sa6
equals 8, and received Sa6 equals C.
TIME-SLOT 1
0
0
TIME-SLOT 2 TIME-SLOT 3
F BIT
(STUFF TIME-SLOT)
0
0
TIME-SLOT 1 TIME-SLOT 2
0
Figure 58. DS1 Transparent Frame Structur e
0
0
F BIT
TIME-SLOT 31 TIME-SLOT 32
TIME-SLOT 24
(continued)
32 TIME-SLOT CHI FRAME
TRAMSMIT FRAMER’S
193-bit FRAME
DS1 = 125 s
Agere Systems Inc.
May 2001
5-5989(F).ar.1