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| 型号： | IDT82V2608 |
| 厂商： | Integrated Device Technology, Inc. |
| 英文描述： | INVERSE MULTIPLEXING FOR ATM |
| 中文描述： | 反向复用的ATM |
| 文件页数： | 22/98页 |
| 文件大小： | 398K |
| 代理商： | IDT82V2608 |
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INTERFACE
22
December 4, 2006
IDT82V2608
Inverse Multiplexing for ATM
T1 ISDN Mode
The T1 ISDN mode corresponds to the use of 23 time slots to
transmt data, that is, T1 data is not transmtted during the framng bit
and time slot 24. Therefore, only 23 time slots are considered useful and
are mapped while time slot 24 and the framng bit are meaningless and
are not mapped.
T1 Normal Mode
In this mode, data is not transmtted during the framng bit. The other
24 time slots are useful.
3.2.1.3 Mode5~Mode6
In these modes, the transmt/receive data rate is T1 channelized, and
the line interface timng clock is 1.544 MHz (T1 clock). The ISDN mode
and normal mode are defined in
T1 ISDN Mode
and
T1 Normal Mode
on
page 22
.
In these modes, the clock for Tx and Rx can be either common clock
or independent clock. If common clock is used, TSCCK and RSCCK are
used as Tx clock and Rx clock respectively, and TSCFS and RSCFS are
used as common frame pulse in Tx and Rx directions respectively. If
independent clock is used, TSCK[i] and RSCK[i] are used as Tx clock
and Rx clock respectively, and TSF[i] and RSF[i] are used as the frame
pulse in Tx and Rx directions respectively.
3.2.1.4 Mode7~Mode10
In these modes, only TSCCK and RSCCK are used to input the
8.192 MHz clock in Tx and Rx directions respectively, and TSCFS and
RSCFS are used as common frame pulse in Tx and Rx directions
respectively. All the TSCK[i], TSF[i], RSCK[i] and RSF[i] pins are not
used and should be connected to ground. The unused RSD pins should
also be connected to ground.
The data pins used for multiplexing are shown in the table below:
Multi-rate
Multi-rate is used for multiplexing four E1 streams into one high-
speed stream
Figure-7
shows four 2.048 MHz E1 streams multiplexed
into a single 8.192 MHz streamthrough one data pin. The multiplexing
uses the round-robin technology. The systemprovides 8.192 MHz
common clock and 8 kHz common frame pulse.
For T1 channel, before multiplexing, a mapping fromeach T1 frame
to E1 frame is first done. Then the mapped 4 E1 channels are multi-
plexed into one 8.192 MHz streamas shown in
Figure-7
.
Figure-7 Multiplexing Four 2 MHz Streams into One 8
MHz Stream
T1 Multi-Rate Mode
Since there are two T1 to E1 mapping methods that can be used as
described in
G.802 Mapping
and
Spaced Mapping
on
page 20
, two new
modes can be derived when multiplexing is further used. Again, T1
ISDN data mode and T1 normal mode can be applied, thus we have 4
more modes: mode7~mode10.
3.2.1.5 Mode11
In this mode, the transmt and receive data are viewed as a contin-
uous 2.048 Mb/s serial stream There is no concept of time slot in an
unchannelized link. Each eight bits are grouped into an octet. TSF or
TSCFS signal determne whether the data streamis in byte alignment or
not. The first bit received/transmtted is the most significant bit of an
octet while the last bit is the least significant bit. The 2.048 MHz data
streamclock is provided by the system
In this mode, the clock for Tx and Rx can be either common clock or
independent clock. If common clock is used, TSCCK and RSCCK are
used as Tx clock and Rx clock respectively. If independent clock is used,
the clock for the i-th link comes fromTSCK[i] and RSCK[i] in Tx and Rx
directions respectively.
In Common Clock Mode, the TSCFS signal is used for byte align-
ment pulse for the transmtted bit streamwhile in Independent Clock
Mode, the TSF[i] signal is used for byte alignment pulse for the i-th
transmt link.
The frequency for TSF[i] (or TSCSF) is the result of TSCK[i] (or
TSCCK) divided by 256 and the pulse width of this signal is one cycle of
TSCK[i] or TSCCK signal.
3.2.1.6 Mode12~Mode13
These two modes are E1 non-multi-rate combined with different
signalling modes. The non-multi-rate is the channelized generic E1 inter-
face, i.e., a 2.048 MHz channel is divided into 32 sub-channels (also
called time slots), and these sub-channels are used to exchange data.
In these modes, the clock for Tx and Rx can be either common clock
or independent clock. If common clock is used, TSCCK and RSCCK are
used as Tx clock and Rx clock respectively, and TSCFS and RSCFS are
used as common frame pulse in Tx and Rx directions respectively. If
independent clock is used, TSCK[i] and RSCK[i] are used as Tx clock
and Rx clock respectively, and TSF[i] and RSF[i] are used as the frame
pulse in Tx and Rx directions respectively.
Table-3 Pins Used in Multi-Rate Multiplex Mode
Tx Pin Name
Rx Pin Name
Multiplexed Channel
TSD[1]
RSD[1]
channel 1~channel 4
TSD[2]
RSD[2]
channel 5~channel 8
0
1
2
3
4
5
6
7
8
9
10
11
Byte0
Byte1
Byte2
Byte0
Byte1
Byte2
Byte0
Byte1
Byte2
Byte0
Byte1
Byte2
1st 2 Mbps stream
2nd 2 Mbps stream
3rd 2 Mbps stream
4th 2 Mbps stream
8 Mbps stream
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