Paradyne 3980-A2-GZ40-20 Page 9 Features Manual Download

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3980-A2-GZ40-20

November 1996

Table 3

AT Commands for SDC

Command

Description

DCP LCD

Command

Sequence

#DM

SDC Delay Minimization.

Minimizes the delay introduced by SDC by allowing the modem to transmit a
DTE frame to its DTE in a discontinuous way.

#DM0

No delay minimization. The modem does not begin transmitting a
frame to its DTE until the entire frame has been received.

#DM1

Delay minimization. The modem begins to transmit data from a
DTE frame to its DTE even if the end of the DTE frame has not yet
been received by the modem.

The factory setting is No Delay Minimization.

Configure\Edit\
V42/MNP/Buffer

Sync Flow Ctrl. Synchronous Flow Control of DTE.

Controls the type of synchronous data flow control while using data
compression.

#Q0

No flow control.

#Q1

Flow control using transmit clock (circuit 114).

#Q2

Flow control using CTS (circuit 106).

The factory setting is No Flow Control.

Configure\Edit\
V42/MNP/Buffer

#SC

Sync Comp Mode. Synchronous Compression Mode.

Enables and disables synchronous data compression.

#SC0

Disable Synchronous Data Compression mode.

#SC1

Enable Synchronous Data Compression mode.

The factory setting is Disable.

Configure\Edit\
V42/MNP/Buffer

Summary of Contents for 3980-A2-GZ40-20

Page 1: ...is of Paradyne s SDC feature With the SDC feature two DTEs can exchange data via a synchronous protocol Figure 1 while the DCE provides the new synchronous data compression and error correction functions Figure 2 The synchronous data from the local DTE after compression is inserted into DCE frames which are sent to the remote DCE Inverse operations then occur at the remote DCE SDC can be used with...

Page 2: ... 3 If the SDC option is not visible press the key until SDC appears NOTE If SDC has been installed on this modem SDC will not appear 4 Press the function key F1 F2 or F3 directly beneath SDC 5 Enter the Product Authorization Code for SDC Use the and keys to move the cursor to each digit position Press F2 to increment each digit to the required value The Product Authorization Code for SDC is 0 1 1 ...

Page 3: ... 011993 The modem responds OK 4 Perform a power reset Enter the command ATZ9 5 Check the installed features Enter the command AT I0 The modem responds with a list of features installed in your modem including SDC 6 Set the SDC configuration options suitable for your environment See Tables 3 and 4 Menu Status and Result Codes When SDC is active and the modem is online the top line of the DCP displa...

Page 4: ...eature Some of the configuration options are not displayed unless SDC is enabled V 42 MNP Buffer see Table 1 Sync Comp Mode SDC Negotiation SDC Idle Fill SDC Bit Encoding Sync DTE CRC SDC Delay Min Sync Flow Control TX Buff Disc Delay RX Buff Disc Delay Max Frame Size Cellular Enhance DTE Interface see Table 2 Sync DTE Rate Tx Clock Source ...

Page 5: ...ction If the remote modem has SDC capability then the connection is established with SDC active If the remote modem does not have SDC capability then no connection occurs and the modem generates a disconnect The AT command for SDC Negotiation is S28 n See Table 4 page 10 SDC Idle Fill Flag_Fill Nxt Flag_Fill Mark_Fill This configuration option only appears when the Async Sync Mode configuration op...

Page 6: ... a frame to its DTE until the entire frame has been received Rx_Clock The modem begins to transmit data from a DTE frame to its DTE even if the end of the DTE frame has not yet been received by the modem The receive clock circuit 115 is clamped when the beginning of a DTE frame has been transmitted to the DTE and no other data from this DTE frame has been received by the modem As soon as data from...

Page 7: ...nnects immediately without attempting to send data stored in its buffer 10 60 sec Maximum amount of time the modem tries to empty its buffer before disconnecting In both cases 10 sec and 60 sec the modem disconnects much sooner if it can empty its buffer The AT command for RXBuffDiscDelay is S39 n Max Frame Size 256 Nxt 256 192 128 64 32 16 This configuration option only appears when Async Sync Mo...

Page 8: ...citance and the DTE s drivers and receivers External transmit clocking may be required The AT command for Sync DTE Rate is S30 n See Table 4 page 10 Tx Clock Source Internal Nxt Internal External RXC_Loop This configuration option only appears when Async Sync Mode is configured for Sync Transmit Clock Source Determines the source of timing for synchronous data transmitted from the DTE Internal The...

Page 9: ...the DTE frame has not yet been received by the modem The factory setting is No Delay Minimization Configure Edit V42 MNP Buffer Qn Sync Flow Ctrl Synchronous Flow Control of DTE Controls the type of synchronous data flow control while using data compression Q0 No flow control Q1 Flow control using transmit clock circuit 114 Q2 Flow control using CTS circuit 106 The factory setting is No Flow Contr...

Page 10: ...mark to fill the time between DTE frame transfers Register has the following values 0 Flag_Fill 1 Mark_Fill The factory setting is Flag_Fill Configure Edit V42 MNP Buffer S30 Sync DTE Rate Synchronous DTE Rate Identifies the synchronous DTE s operating rate to the modem Register has the following values 0 128 000 bps 1 115 200 bps 2 112 000 bps 3 96 000 bps 4 76 800 bps 5 72 000 bps 6 64 000 bps 7...

Page 11: ...t encoding used when transmitting synchronous DTE data Register has the following values 0 NRZ 1 NRZI The factory setting is NRZ Configure Edit V42 MNP Buffer S32 SyncDTE CRC Determines whether the CRC of the DTE frame is transmitted from modem to modem Register has the following values 0 Ignore 1 CRC16 The factory setting is Ignore Configure Edit V42 MNP Buffer ...

Page 12: ...Min configuration option set to Rx_Clock there is no limitation on the DTE frame size for the DTE frames transmitted from the remote modem to this local modem since the whole frame need not be buffered The SyncDTE CRC configuration option determines whether the CRC of the DTE frame the FCS field is transmitted If the CRC type is known to be the 16 bit CRC for HDLC frames as defined by ITU T genera...

Page 13: ...E line or clock frequencies in the range from 1 2 kHz to 128 kHz When the transmit clock is provided by the DTE the receive clock is set by the modem equal to the DTE clock Figure 4 When SDC is in use the Tx Clock Source configuration option cannot be set to Receiver Clock Loop NOTE When faster speeds are used above 57 6 kHz and the transmit clock is provided by the modem data transmission can be ...

Page 14: ...ops sending data This method only works when the transmit clock is provided by the modem Natural flow control Some DTEs can only send a limited number of information frames without any acknowledgment from the remote DTE This number is the acknowledgment window size If the DCE buffers this number of DTE frames it will not receive another DTE frame This is equivalent to the SyncFlowControl configura...

Page 15: ...t be established between the two modems For example the link will not be established if the remote modem is configured for Async mode with an EC mode of V42 MNPorBfr V42 MNPorDsc LAPM_Buffer or LAPM_Discon On a leased line the originating modem sends an endless EC negotiation sequence with the SDC request parameter Data cannot be successfully transmitted On a leased line the answering modem waits ...

Page 16: ...ation does not include the DCE interframe time fill Tuning SDC Efficiency SDC efficiency is dependent on the configuration parameters of the DTE and the modem DTE Configuration The way DTE parameters are changed and whether they can be changed depends on your DTE See the documentation that came with your DTE DTE rate configuration parameter The nominal DTE rate the Tx Rx clock s frequency at the D...

Page 17: ...E ONCE YOU HAVE READ THIS LICENSE AGREEMENT AND AGREE TO ITS TERMS YOU MAY USE THE SOFTWARE BY USING THE SOFTWARE YOU SHOW YOUR ACCEPTANCE OF THE TERMS OF THIS LICENSE AGREEMENT The terms and conditions of this Agreement will apply to the Software supplied herewith and derivatives obtained therefrom including any copy If you have executed a separate written agreement covering the Software supplied...

Page 18: ...he Software However you assume the risk of any and all damage or loss from use or inability to use the software b Unless a separate agreement for software support is entered into between you and Paradyne Paradyne bears no responsibility for supplying assistance for fixing errors or for communicating known errors to you pertaining to the Software 5 CHARGES AND USE YOU ACKNOWLEDGE THAT YOU HAVE READ...

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