The T1/E1
framer multiplexes the PCM data, signaling data
and data link data onto the T1/E1 line. The
deframer de-assembles the PCM data, signaling
data and data link data from the serial data
received on the T1/E1 line. Alarms are generated
at the de- assembler in accordance with the
ITU-T recommendations.
In Framer, a serial interface is provided to
the T1/E1 line for receiving the serial data
output of the Framer. In De-Framer, the De-Framer
provides a serial interface to the T1/E1 line,
and the serial T1/E1 framed data is clocked
into the de-framer from the line.
GDA's T1/E1 Framer works as per the ITU-T G.704
standard. The multiplexed data has to be clocked
to the T1/E1 lines at the T1/E1 clock rates.
The function of the de-framer is to re-synchronize
with the start of the frame and extract the
data link, signalling, CRC, PCM data from the
received serial bit stream or to loose synchronization
as per ITU-T G.706 standard.
|
Click
here for actual image |
| |
| |
| |
| |
| |
| |
| |
| * - Generally sold with GDA services only |
|
|
Features |
- Conforms to ITU-T
recommendations, G.704, G.706and G.775
- Fully independent
framer and de-framer with feedback to
framer from de-framer
- T1 framer supports
SF and ESF framing formats
- Supports ABCD signaling
in T1-ESF mode, AB signaling in T1-SF
mode and channel associated signaling
in E1 mode
- Provides two frame/four
frame controlled slip buffers with parameterized
threshold for repeating and deleting
frames.
- Fully synchronous design
using multiple clocks, with asynchronous
reset synchronized for different clocks
- Supports CRC in T1-ESF
and E1 framer/de-framer.
- Provides detection
of Blue Alarm (AIS) and Red
alarm (Loss of synchronization by de-framer)
- Indicates occurrence
of CRC errors, framing bit errors and
controlled slips.
- Automatic internetworking
between CRC-4 and non CRC-4 interfaces
for E1 framer and de-framer as specified
in ITU-T G.706 recommendation
|
| |
| |
|
| |
|
|
|
|
|