Agreement (TS27010) of multiplexing of serial communication link between data terminal equipment a

							Agreement (TS27.010) of multiplexing of serial communication link between
data terminal equipment and wireless communication module Development,
with the technical rapid development of mobile communication in the
embedded system, the movable termination with wireless communication
function is developed rapidly too. These movable terminations support
business such as the ordinary speech, short message, with the fast
enlargement of G P R S network overlapping, it is held that increasingly
many / the vehicle carried movable termination begins to support G P R S
business of networking too. What the business of integration on a
terminal installation, these are questions that a lot of mobile terminal
device developers face. I have adopted T S 2 7 of 3 G P P in the course
of developing a vehicle carried movable termination. 010 agreements, the
business of integration successfully. 1 T S 2 7 . 010 agreement
introductions In commonly used G S M / G P R S communication module (such
as Q 2400 of M 35, W a v e C o m of S i e m e n s) ,Can only pass
ordinary 9 for one Asynchronous serial port and terminal installation T
E (T e r m i n a l E q u i p m e n t) of the needle Carry on
communication. T E and M S ? M o b i l e S t a t i o n    Need to
exchange various typological data through this serial port, for example:
Maintenance, battery state, G P R S, U S S D of pronunciation, fax, data,
S M S, C B S, telephone number one,etc.. How to support so much business
on a serial port at the same time? For example, in data communication,
how to send or receive S M S? In order to solve these problems, 3 G P P
has proposed an agreement --T S 2 7 . 010 agreements ( T e r m i n a l E
q u i p m e n t t o M o b i l e S t a t i o n M u l t i p l e x e r P r o
t o c o l ) . There is M u l t i p l e x e r, even can send S M S in data
connection. Other business can go on to make up at the same time too. For
example, digital speech and S M S are sent at the same time. The
existence of M u l t i p l e x e r makes an intact system divide
depending upon need. M u l t i p l e x e r design of 3 G P P is very
flexible, and is independent of M S / T E platform, the existing utility
program does not need changing and can work. While designing M u l t i p
l e x e r, especially consider that adopts the demand for the battery-
opwered apparatus, so include very important functions such as the mode
control of electric-saving,etc., and M u l t i p l e x e r tries hard to
use minimum power consumption and memory during operation. M u l t i p l
e x e r is based on H D L C standard design of I S O, works under the
single mode with many kinds of options. But B a s i c O p t i o n does
not comply with H D L C. Under basically selecting the mode, M u l t i p
l e x e r does not have transparent mechanism, there is not a error
correction function. But advanced to select (A d v a n c e d O p t i o n)
Under the mode, use the transparent mechanism of H D L C, and M u l t i p
l e x e r has a synchronization mechanism of convenience, can be in D C 1
/ D C 3 (X O N / X O F F) Work on the periodic line turned on in flow
control, and include the error correction function. M u l t i p l e x e r
of 3 G P P depends on a control channel. On this control channel, T E
exchanges control information, for example the parameter control
information, flow control information,etc. of consulting, economizing on
electricity with M S. M u l t i p l e x e r is that one can select, if
support this function, should use A T + C M U X command to activate it.
M u l t i p l e x e r is T E and M S is at each initial /stop modal,
transmit the data flow to offer a set of mechanisms on serial periodic
line of the subframe function. Fig. 1 provides different protocol layers
and functions to hint. The M u l t i p l e x e r layer is responsible for
transmitting the way that the data flow according to the byte, do not
carry on the further framing again; If the data need transmitting
according to certain structure, need increasing one convergence layer
finishes these functions. M u l t i p l e x e r is photogenic for the
process sum M S on T E to provide one for process of answering virtually
to connect, T E and process at the M S can virtual to connect
communication through this piece in this way. For example, S M S utility
program on T E can be connected with M S S M S handler on through a M u l
t i p l e x e r passway. T S 2 7 . 010 norms use s t a r t - s t o p
mode of transmission of 8 b i t character, the communication between two
M u l i t p l e x e r entities has used the specified frame format. Each
signal channel between T E and M S is called a data link connection D L C
(D a t a L i n k C o n n e c t i o n) ,These D L C is set up
independently sequentially. Flow control mechanism that each D L C can be
one's own. M u l t i p l e x e r has three kinds of work patterns: B a s
i c, A d v a n c e d w i t h o u t e r r o r r e c o v e r y and A d v a
n c e d w i t h e r r o r r e c o v e r y . These three kinds of mode
characteristics are as follows: Communication Center News Information
www.CCNinfo.com   Related Articles - T S 2 7 . 010 agreements, module,
      Email this Article to a Friend!Receive Articles like this one
direct to your email box!Subscribe for free today!

http://www.amazines.com/Communication/article_detail.cfm/1938436?articlei
d=1938436