參數(shù)資料
型號(hào)： PCD5008H
廠商： NXP SEMICONDUCTORS
元件分類： 尋呼電路
英文描述： FLEX Pager Decoder
中文描述： TELECOM, PAGING DECODER, PQFP32
封裝： 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, SOT-358-1, LQFP-32
文件頁數(shù)： 59/64頁
文件大?。?/td> 341K
代理商： PCD5008H
1998 Jun 17
59
Philips Semiconductors
Product specification
FLEX
Pager Decoder
PCD5008
15.3
FLEX
encoding and decoding rules
The encoding and decoding rules identify the minimum
requirements which must be met by the paging device,
paging terminal or other encoding equipment to properly
format a FLEX
data stream for RF transmission and to
successfully decode it.
15.3.1
FLEX
ENCODING RULES
The FLEX
encoding rules are as follows:
The stability of the encoder clock used to establish time
positions of FLEX
frames must be no worse than
±
25 ppm (including worst case temperature and aging
effects).
A maximum of 2 occurrences of an identical individual or
radio group address is allowed in any frame for
unfragmented messages. This rule applies across all
phases in a multi-phase frame. For example, for
decoding devices that support any-phase addressing,
an any-phase address may appear at once in two
different phases in a single multi-phase frame.
Once an individual or radio group address is used to
begin transmitting a fragmented message, that same
address must not be used to start a new fragmented
transmission until the first fragmented transmission has
been completed.
For the duration of time that an individual or radio group
address is being used to send a fragmented message,
that same address must not appear more than once in
any frame to send an unfragmented message.
Once a specific dynamic group address (temporary
address) is assigned to a group, it must not be reused
until its associated message has been transmitted in its
entirety. Given this constraint, the same dynamic group
address can only appear once in any frame.
A dynamic group address cannot be used to set up a
second dynamic group.
Messages using any of the three defined numeric
vectors (V
2
V
1
V
0
= 011, 100 and 111) cannot be
fragmented, and thus must be completely contained in a
single frame.
Fragments of the same message must be sent at a
frequency of at least 1 every 32 frames (i.e. at least
once a minute) or 1 every 128 frames (i.e. at least once
every 4 minutes) as specified by the service provider.
Enhanced message fragmenting for symbolic character
transmission requires that the encoder track character
boundaries within each fragment in order to avoid
character splitting.
Message numbering as an optional feature is offered by
some carriers and available on an individual subscriber
basis.
Message numbers must be assigned sequentially in
ascending order.
Message number sequences must be separately
maintained for each individual and radio group address.
Message numbers are not used (retrieval message
number disabled) in conjunction with a dynamic group
address.
When a missed message is re-transmitted from
message retrieval storage, the message must have
R = 0 to avoid creating an out of sequence message
which may cause the pager to indicate a missed
message.
15.3.2
FLEX
DECODING RULES
The FLEX
decoding rules are as follows:
FLEX
decoding devices may implement either
single-phase addressing or any-phase addressing.
FLEX
decoding devices that support the numeric
vector type (V
2
V
1
V
0
= 011) must also support the short
message vector (V
2
V
1
V
0
= 010) with the message
type (t
1
t
0
) set to 00.
FLEX
decoding devices that support the alphanumeric
vector type (V
2
V
1
V
0
= 101) must support the numeric
vector type (V
2
V
1
V
0
= 011) and the short message
vector (V
2
V
1
V
0
= 010) with the message type (t
1
t
0
)
set to 00, FLEX
paging devices that implement
any-phase and support the alphanumeric vector type
(V
2
V
1
V
0
= 101) must also support the short instruction
vector (V
2
V
1
V
0
= 001) with the instruction type (i
2
i
1
i
0
)
set to 000.
FLEX
decoding devices must be capable of decoding
frames at all of the following combinations of data rate
and modulation mode. They are: 1600 bps 2 level;
3200 bps 2 level; 3200 4 level and 6400 bps 4 level.
FLEX
decoding devices must be designed to tolerate
4 minute fragment separation times.
相關(guān)PDF資料
PDF描述
PCD5013 FLEX roaming decoder II
PCD5013H FLEX roaming decoder II
PCD5032 ADPCM CODEC for digital cordless telephones
PCD5032H ADPCM CODEC for digital cordless telephones
PCD5032T ADPCM CODEC for digital cordless telephones
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCD5008HBD-T 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication Decoder
PCD5013 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FLEX roaming decoder II
PCD5013H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FLEX roaming decoder II
PCD5032 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ADPCM CODEC for digital cordless telephones
PCD5032B 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Linear CODEC
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*