Please refer to this standard for details. GB/T 11596-1999 Interface between DCE/DTE of the assembly and disassembly (PAD) facilities of start-stop data terminals entering the national public data network GB/T11596-1999 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T11596—1999
idtITU-TX.28:1997
DCE/DTE interface for a start-stop mode data terminal equipment accessing the packetassembly/disassemblyfacility(PAD)in apublic data networksituated in the same countryPublished on November 11, 1999
Implementation on June 1, 2000
State Administration of Quality and Technical Supervision
GB/T11596—1999
This standard is equivalent to the ITU-TX.28:1997 recommendation.
This standard defines the interface between DCE/DTE of the packet assembly and disassembly (PAD) facilities of the start-stop data terminal entering the national public data network, the procedures for establishing the domestic access information channel between the start-stop DTE and PAD, the procedures for character exchange and service initialization between the start-stop DTE and PAD, the procedures for exchanging control information between the start-stop DTE and PAD, the procedures for exchanging user data between the start-stop DTE and PAD, and the multi-feature PAD (MAP) framework and service definition. In order to adapt to the development of domestic packet switching technology and to be in line with international standards, this standard has revised GB/T11596-1989 in accordance with the principles of perfection, applicability and practicality. The main contents of the revision are as follows: 1) The terms are modified as follows:
Packet assembly/disassembly facility→Packet assembly/disassembly facilityPublic switched telephone network-→Public switched telephone network (PSTN)Release→Clear
Parity check→Parity check
Characteristic value→Profile
"Promote PAD service" signal→"Prompt PAD service" signal"Set PAD command" signal→"Set PAD command" signalCall transfer notification→Call redirection and call resending notification2) In the state transition diagram of Chapter 2, 5A) states (Figure 2) and 7 new PAD parameters are added to the value table in the transparent standard profile and simple standard profile 1).
3) In Chapter 3, the contents of multiple PAD command signal formats have been added or modified (3.5), and the usage procedures (such as 3.2.2.1.2, 3.3.4, 3.4.2) and format descriptions (3.5) of the PAD command signals (Table 2) in the exchange control information procedures have been added. The text description of the extended dialogue mode of the PAD service signal has been added (Table 6, Table 7, Table 8), and the impact of the use of 7 new PAD parameters on the procedures (3.6) have been added. 4) In Chapter 4, the description of the interleaving processing procedures for loopback and output has been added (4.19), and the description of the interrupt display procedures (4.20). 5) Chapter 5 is a new chapter that describes the additional PAD command signals and PAD service signal formats that can be used in the extended dialogue mode. 6) Chapter 6 is a new chapter that describes the operation of the multi-function PAD (MAP) that complies with Recommendation X.8. Other standards referenced in this standard are listed as follows: GB/T11590—1999
GB/T11591—1999
GB/T11592—1989
GB/T11593—1989
GB/T11595—1999
GB/T11597—1999
International data transmission services and optional user service facilities for public data networks (eqvITU-TX.2:1996)
Packet assembly and disassembly (PAD) facilities in public data networks (idtITU-TX.3:1993)Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) used to start/stop transmission services on public data networks (idtITU-TX.20:1984)Data terminals working synchronously on public data networks Interface between packet-based data terminal equipment (DTE) and data circuit-terminating equipment (DCE) (idtITU-TX.21:1984)
Interface between packet-based data terminal equipment (DTE) and data circuit-terminating equipment (DCE) connected to a public data network using dedicated circuits (idtITU-TX.25:1996)Procedure for exchanging control information and user data between a packet assembly and disassembly (PAD) facility and a packet-based DTE or another PAD (idtITU-TX.29:1997)I
GB/T11596—1999
GB/T11600—1989
Use of data terminal equipment (DTE) interfaced with asynchronous duplex V-series modems on public data networks (idtITU-TX.20bis:1984)Appendices A and B of this standard are appendices to the standard. This standard shall replace GB/T11596—1989 from the date of its implementation. This standard is proposed by the Ministry of Posts and Telecommunications of the People's Republic of China. This standard is under the jurisdiction of the Telecommunications Science Research and Planning Institute of the Ministry of Posts and Telecommunications. This standard was drafted by the Data Communication Technology Research Institute of the Ministry of Posts and Telecommunications. The main drafter of this standard is Goli.
This standard is entrusted to the Data Communication Technology Research Institute of the Ministry of Posts and Telecommunications for interpretation. GB/T11596—1999
ITU-T Foreword
Many countries have established public data networks that provide packet-switched data transmission services. This makes it necessary to formulate some standards to promote public telephone networks, circuit-switched public data networks, and leased circuit access to packet-switched public data networks. ITU-T
(a) Recommendations X.1 and X.2 specify the user service categories and user facilities provided by public data networks. Recommendation X.96 specifies call progress signaling,
(b) Recommendation X.29 specifies the control of PAD by packet-based DTE and the procedures for intercommunication between PADs (c) Recommendation X.3 specifies the packet assembly and disassembly (PAD) facilities on the public data network; (d) Recommendation X.92 specifies the logical control link for packet-switched data transmission services; (e) An international recommendation for the exchange of information between the start-stop DTE and PAD must be specified; (f) The start-stop DTE will send and receive network call control information and user information in the form of characters or "break" signals of Recommendation T.50,
(g) The necessary elements of the interface recommendation should be separately specified as: 1) Procedures for establishing a national access information path between the start-stop DTE and PAD. 2) Procedures for character exchange and service initialization between the start-stop DTE and PAD. 3) Procedures for exchanging control information between the start-stop DTE and PAD. 4) Procedures for exchanging user data between the start-stop DTE and PAD. (h) Recommendation X.8 specifies the Multi-Feature PAD (MAP) framework and service definitions. To the Recommendation:
The start-stop DTE accessing the PAD should operate in accordance with this Recommendation. I
National Standard of the People's Republic of China
DCE/DTE interfacefor a start-stop modedata terminal equipment accessing the packetassembly/disassemblyfacility (PAD)in a pubicdata network situated in the same country1Procedure for establishing a domestic access information path between a start-stop mode DTE and PAD1.1 Access via a public switched telephone network or leased lines with V-series interface1.1.1 DTE/DCE interface
GB/T11596—1999
idtITU-TX.28:1997
Replaces GB/T11596—1989
The access information path shall be provided by a standardized modem used on the public switched telephone network or leased lines. The operation is as follows: a) Rates of 300 bit/s and below comply with Recommendation V.21; or b) on the public switched telephone network or two-wire leased circuits, rates of 1200 bit/s comply with Recommendation V.22B Mode 2 or V.22z Mode 4; rates of 2400 bit/s comply with Recommendation V.22B Mode 2, and on four-wire leased circuits without a reverse channel, rates of 1200 bit/s and below comply with Recommendation V.22z Mode 4.23, or c) at a rate of 75/1200 bit/s (1200 bit/s is the rate at which the DTE receives the signal, and 75 bit/s is the rate at which the DTE sends the signal on the reverse channel), in accordance with Recommendation V.23. The specific interchange circuits provided and their operation shall comply with the recommendations for modems. The clamping of circuit 104 shall be implemented in accordance with the provisions of 4.3 of Recommendation V.24.
At rates below 300 bit/s or 1200 bit/s or 2400 bit/s: d) On the telephone network, the modem must be set up in accordance with Recommendation V.21 or Recommendation V.22 or Recommendation V.22z for channel operation to be practical, or
e) On a leased line (second line), the modem on the DTE side is regarded as a device for making a telephone call, and channel operation is determined by the same rules.
At rates of 75/1200 bit/s; the modem must establish channel operation in accordance with Recommendation V.23. Notes
1 Interface requirements for other data signal rates are yet to be determined. 2 In some networks, reference to modem characteristics is not applicable (e.g. leased lines). 1.1.2 Electrical characteristics
The electrical characteristics of the DTE/DCE interface comply with this standard. 1.1.3 Procedures for establishing and dismantling "access information path" 1.1.3.1 Access information path established by DTE The manual data station calling the automatic answering station shall establish the access information path in accordance with Recommendation V.25. Approved by the State Administration of Quality and Technical Supervision on November 11, 1999 and implemented on June 1, 2000
GB/T11596—1999
In some domestic networks of the access information path, the echo suppressor is not included and the echo suppressor cancellation device may not be implemented. After completing the above operations, both DTE and DCE transmit binary 1" on circuits 103 and 104. 1.1.3.2 Dismantling of the access information path by DTE The access information path should be cleared by the following conditions: a) the data circuit is switched back to voice mode, or b) DTE disconnects circuit 108/1 or 108/2 for a time period greater than Z, where the value of Z is to be determined. 1.1.3.3 Establishment of the access information path by PAD From the DTE's perspective, the procedure for PAD to establish the access information path should comply with Recommendation V.25. 1.1.3.4 Dismantling of the access information path by PAD When circuit 108\ is "connected", DCE makes circuit 106 and circuit 109\disconnected" to indicate that the path has been removed by the PAD. Note: The clearing indication of the DTE access information path is not indicated by "disconnecting" circuit 107. If circuit 108 has not been turned to "disconnected" before, not all DTEs allow circuit 107 to be turned to "disconnected". 1.2 Access via a public data switching network or a leased line with an X-series interface 1.2.1 DTE/DCE interface designed for start-stop transmission services on a public data network (Recommendation X.20). 1.2.1.1 Physical characteristics
The physical characteristics of the DTE/DCE interface are specified in Section 2 of Recommendation X.20. 1.2 .1.2 Procedures for establishing and tearing down access information paths (call control) The call control procedures and formats for public circuit-switched data networks are described in sections 3 and 4 of Recommendation X.20. The procedures for establishing virtual calls in packet-switched networks are given in 2.3.4 of this standard. The procedures for establishing virtual calls by PAD using Recommendation X.20 are to be determined. 1.2.2 DTE/DCE interfaces designed for operation in telephone-type networks (Recommendation X20bis). For DTEs with interfaces designed for operation in telephone-type networks (V-series interfaces), the access information path will be provided by standards for start-stop transmission services in public data networks that conform to Recommendation X.20bis. 1.2.2.1 Characteristics of the interface circuits
Section 2 of Recommendation X.20bis describes the characteristics of the interface circuits. 1.2.2.2 Operational requirementsbzxZ.net
Section 3 of Recommendation X.20bis specifies the operational requirements of interface circuits 106, 107, 108, 109 and 125. 1.2.2.3 Operational requirements for removal of the access information path by the DTE The removal of the access information path
is accomplished either manually by pressing the DCE clear key,
or automatically by the DTE turning circuits 108/1 or 108/2 to the "disconnected" state within a period of more than 210 ms. 1.2.2.4 Indication of PAD removal
The removal of the PAD, i.e., DCE clearing, will be indicated by the DCE turning circuits 106 and 109 to "disconnected". The DTE then completes the clear confirmation by turning circuit 108 to "disconnected". 1.2.2.5 Establishment of access information channel by PAD The procedure for establishing access information channel by PAD is to be determined. 1.2.2.6 Transmission of a "break" signal longer than 200ms during information transfer to maintain operational restrictions on access information channel can cause disconnection in the public data switching network. Therefore, either avoid transmitting "break" signals in either direction or adjust the circuit timer that generates the "break" signal so that the width of the signal it generates is much less than 200ms (see 3.1.2).
2 Procedure for character exchange and service initialization between start-stop DTE and PAD 2.1 Character format for exchanging control information between start-stop DTE and PAD 2.1.1 Start-stop DTE should generate and be able to receive characters of the International Code Table No. 5 specified in Recommendation T.50. The general structure of these characters should comply with Recommendation X.4, except that the stop bit 2
GB/T11596-1999
is sent as described in 2.1.2. The character formats specified below apply to the procedures described in Chapters 2 and 3 of this standard.
2.1.2 PAD sends and expects to receive 8-bit characters When the value of parameter 21 is set to 0, whenever the PAD must send a character or must interpret a received character to take a specific action other than or in addition to transmitting the character to the remote DTE, the PAD only checks the first 7 bits and ignores the 8th bit (the last bit before the stop symbol). When the value of parameter 21 is set to 1, the PAD uses the 8th bit of the character received from the start-stop DTE as the parity check bit and checks this bit according to the parity check type L used between the PAD and the start-stop DTE: odd check, even check, space (\0") or mark ("0\).
When the value of parameter 21 is set to 2, the PAD replaces the 8th bit of the character to be sent to the start-stop DTE with a bit that corresponds to the parity check type used between the PAD and the start-stop DTE. When the value of parameter 21 is set to 3, the PAD both checks the parity bits of characters received from the start-stop DTE and generates parity bits for characters sent to the start-stop DTE, as described by values ​​1 and 2. When the value of parameter 21 is set to 4, the PAD transmits the 8th bit transparently regardless of whether the PAD is sending data characters or interpreting received characters.
Whenever PAD generates characters (such as "PAD service" signals), when the value of parameter 21 is set to 0, PAD will transmit these characters in even parity mode. If the value of parameter 21 is set to 1, 2 or 3, PAD will transmit these characters in the parity check mode between PAD and start-stop DTE (even, odd, space "0" or mark "1"). If the value of PAD parameter 21 is set to 4, PAD uses space "0" mode. In addition, when parameter 21 is equal to 0 and the parity is determined by other means (for example, detected by PAD based on the service request signal, as described in 2.2.2), PAD will send service signals according to the detected parity type. When the value of parameter 21 is set to 1 or 3, if PAD When AD detects a parity error in the characters received from the start-stop DTE, PAD will perform the following operations:
- If parameter 2 is set to 0 (no loopback) and parameter 6 is set to 0 (no service signal), reset the virtual circuit. - If parameter 2 is set to 1 (loopback) and parameter 6 is set to 0 (no service signal), discard and do not echo the error character, and send character 0/7 (BEL) to the start-stop DTE.
- If parameter 2 is set to 1 (loopback) and parameter 6 is set to 1 or a greater value (service signal), discard and do not echo the error character, and send character 0/7 (BEL) to the start-stop DTE. PAD may also send a parity error "PAD service" signal to indicate a parity error. When parameter 2 is set to 0 (no loopback) and parameter 6 is set to 1 or a greater value (service signal), the operation of PAD is undetermined. If the start-stop DTE operates at 110 bit/s, the PAD will accept characters with one stop symbol and send characters with at least 2 stop symbols. If the start-stop DTE operates at other rates, the PAD will send and accept characters with 1 stop symbol. 2.2 Initialization Procedure
The reference states in the following procedures correspond to the state diagrams, see Figures 1, 2 and 3. 2.2.1 Working link (state 1)
After the access information path is established, the start-stop DTE and PAD exchange the binary signal "1" through the start-stop DTE/DCE interface, and then the interface is in the "working link" state. 2.2.2 Service request (state 2)
If the interface is in the "working link" state, the DTE sends a character sequence to indicate the "service request" and initialize the PAD. The "service request" signal enables the PAD to detect the data rate, coding and parity selection used by the DTE, and can select the "initial profile of the PAD". The parameters of the ITU-T "standard profile" are summarized in Table 1. The format of the "service request" signal sent by the DTE is given in 3.5.16 below. Some networks allow bypassing state 2. In the case where the start-stop DTE is connected to the PAD by a leased line or when the access information path is established by the PAD, the PAD either knows the rate, code and initial profile required by the start-stop DTE or uses a default value, which depends on the network. In the case where the access information path is established through the start-stop DTE, the method of selecting access can uniquely determine the rate, code and initial profile. Combination. Calling TE
.1 error recording
Business request form
PTE vehicle belt
FADL brush
PA non-letter
sample PA small signal
TTE equal path
confirm a business signal
prohibition withdrawal in progress
connect multiple numbers
respectfully pay
n see
work batch trap
HAI business guide
PAD drink
person call
PA [-service signal
number transmission reverse
Figure 1a) Interface event sequence: call establishment
Thank||A service number
FAT waiting for F
[E is cleared by the holder
information communication
match 3)
GB/T11596—1999
From TXR
According to the applicable
PA call signal→
Wait for the price order
Clear request
PA meeting number
TYTF etc.
Clear the confirmation
AT service signal||tt ||PA learns
Figure 1b) Sequence of events at the interface: Call clearing TEPA will
signal and advance and clear
from IXE
When DTE operates at 300b/s, 1200b/s or 75/1200b/s, PAD will send and receive characters with a stop code element. NOTE
1 Some networks may allow a direct transition from state 1 to state 4, 5 or 7. 2 "DTE clear" can be accomplished by dismantling the access information channel (see Chapter 1 of this standard). The response of DCE is "PAD clear" and the access information channel can also be dismantled.
3PAD clear can also be accomplished by dismantling the access information channel (see Chapter 1 of this standard). 4 The timeout value and R cannot be less than 60s.
「（Note 6）
T. Milling machine
Business clearing
DMTF waiting
Business service health station
PAD multi-waiting transformation
GB/T11596—1999
PADE10)
PAD waiting
Beihai Xinzhong
TYTE waiting
Waiting for transmission-school starts
Digital selection
Consecutive in progress
Figure 2a) When parameter 6 is set to 1, DTE/PAD state Figure 1 For convenience, states 3A and 3B are shown in Figure 2a, which are functionally equivalent. 2 State 8 is used to represent a state during the transmission of all "PAD service signals" (except "editing PAD service signals"). 3 The transition from state 5 to state 8 occurs only when the PAD receives a call sent to a start-stop DTE. 4 Before completing the PAD removal, the PADN can be allowed to enter the "PAD waiting" state for the first time (see 3.2.3.1.2). 5 In some cases, "DTE clearing" is achieved by removing the access information path (see Chapter 1 of this standard). 6 Some networks may allow a direct transition from state 1 to state 4 or 5. 7 The symbolic definition of the state diagram is shown in Figure 3.
8 State 5 is the appropriate state for interface circuit 103 Recommendation X.20bis and Recommendation V.21) or T interface circuit (Recommendation X.20), taking into account that the DTE may not have enough information to maintain this state in all cases, so it may send characters. 9 Some networks allow a transition from state 7 to state 10 for the purpose of receiving a "PAD command" signal (such as a "clear request PAD command" signal), as described in 3.2.1.5.
10 In some networks, when the PAD does not receive a "service request" signal and a "select PAD command" signal to establish a virtual call, a transition from state 1 to state 7 occurs. How the PAD knows the characteristics of the start-stop DTE related to the virtual call depends on the network. Notes
Operational properties omitted
Service enquiry point
PA customer characteristic change
Figure 26)
GB/T11596-1999
PAD()
TAD wait
Etc. special features
Data transfer
Connection is in progress
When parameter 6 is set to 0, DTE/PAD state diagram
1 State 5 can only be transferred to state 9 when PAD receives a start-stop DTE call. 2 Before executing PAD disconnection, PADN is allowed to enter the "PAD wait" state for the first time (see 3.2.3.1.2). 3 In some cases, "DTE clearing" is accomplished by dismantling the access information path (see Chapter 1 of this standard). 4 Some networks may allow state 1 to be changed. Directly enter state 5. 5 See Figure 3 for the symbol definition of the state diagram. eaa
6 State 5 is an appropriate state for interface circuit 103 (Recommendations X.20bis and X.21) or T interface circuit (Recommendation X.20). Considering that the DTE may not have enough information to maintain this state in all cases, it may send characters. Some networks allow transition from state 7 to state 10 in order to receive a "PAD command" signal (such as a "clear request PAD command" signal), as described in 3.2.1.5.
8 Some networks allow transition from state 9 to state 7 to perform called DTE reselection. 9 Some networks make a transition from state 1 to state 7 when the PAD does not receive a "service request" signal and a "select PAD command" signal to establish a virtual call. How the PAD knows the characteristics of the start-stop DTE related to the virtual call depends on the network decision. 7
Format: state number.
Select the transition
GB/T11596—1999
For the transition
t: When accessed according to Recommendation X.20bis or Recommendation V.21, the value of interface circuit 103 or the value of interface circuit T when accessed according to Recommendation X.20. r: When accessed according to Recommendation X.20bis or Recommendation V.21, the value of interface circuit 104 or the value of interface circuit R when accessed according to Recommendation X.20. DTE to DTE data signal.
0 and 1: Stable binary state.
<): Character sequence of International Code Table No. 5. Symbol definition of Figure 3 State diagram
Table 1 PAD parameter settings
[with Recommendation X.3 Related parameter reference numbers and values ​​(see Note 1)] Parameter reference number
(Note 3)
(read only)
Parameter description
Recall PAD with one character
Data forwarding signal selection
Idle timer delay selection
Auxiliary equipment control
"PAD service" signal and "PAD command" signal control
When PAD receives the start-stop DTE "break" signal Operation selection
Output discard
Padding after carriage return (CR)
Start-stop DTE binary rate
Parameters set according to ITU-T standard profile (Note 2) Transparent standard profile (see Note 4)
Set to impossible state (value 0)
Set to no loopback (value 0)
Set to no data forwarding signal (value 0)
Set to 1 second (value 20)
Set to not use X-ON and X-OFF
(value 0)
Set to no "traffic signal" sent to start-stop DTE (value 0)
Set to reset (value 2)
Set to normal data transmission (value 0)
Set to no padding after carriage return (value 0) (see Note 5)
Set to no line break (value 0)
DTE rate indication
Simple standard profile (see Note 4)
Set to possible state (value 1)
Set to loopback (value 1)||tt ||Set to columns 0 and 1 of International Code Table No. 5
All characters and character 7/15 (DLE) (value
Set no timeout (value 0)
Set use X-ON and X-OFF (value
Set to send in "business signal" (value 1)Set reset (value 2)
Set normal data transmission (value 0)
Set no padding after carriage return (value 0) (see Note 5)
Set no line break (value 0)
DTE rate indication
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