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Zypcom Application Note

Product:

Z34-SX, Z34-RX, Z34-SE, Z34-RE, Z32t-SX, Z32t-SE,

Z32t-RX, Z32b-SX, Z32b-SE, Z32b-RE and Z32b-RX

Application:

Leased Line Operation with Synchronous Data

Synchronous leased line operation can be set using DIP

switches or AT commands. Two basic synchronous setups

are described below, one using DIP switch setup and one

using AT commands. Your application may require some

additional commands.

When selecting speed it is important to remember that the

serial port speed and the line speed are the same when using

synchronous communications. When a modem changes

speed during a retrain the synchronous clocks will also

change speed to reflect the new line speed. Since this is the

case, it is usually a good idea to force the line speed in syn-

chronous leased line applications.

Synchronous leased line application considerations are:

Leased line type 4-wire (&L2) or 2-wire (&L1)

Note: SX-/RX-Series modems support 2-/4-wire and SE-/RE-Series are 2-wire

Transmit level (S35) Set to -6dBm (S35=6)

Line speed (S37=nn) Auto (S37=0) or selectable (S37=nn)

Note: For synchronous applications it is a good idea to fix the line speed (S37=nn

N0) since synchronous computers usually are unpredictable when clocks SCR

and SCT (pins 15 and 17) change speeds.

Line speed forced (Nn) Yes (N0) or No (N1)

Note: N1 allows the modem to select the best line rate and allows the modem to

lower speed if lines conditions change. The command N0 forces the line to a

specific speed. It is a good idea to use N0 on line rates for synchronous applica-

tions.

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Zypcom Application Note 1

Sommario

Pagina 1 - Zypcom Application Note

Zypcom Application NoteProduct:Z34-SX, Z34-RX, Z34-SE, Z34-RE, Z32t-SX, Z32t-SE,Z32t-RX, Z32b-SX, Z32b-SE, Z32b-RE and Z32b-RXApplication:Leased Line

Pagina 2

Messages off (Qn) On (Q0) or Off (Q1)Note: After setup usually turn off (Q1)Echo off (En) On (E1) or Off (E0)Note: After setup usually turn off (E0)

Pagina 3

your application. One uses an asynchronous device (PC or terminal) tosend AT commands to the modem which will set it for synchronous leasedline opera

Pagina 4

19,200bps Leased Line with Synchronous Data—Originate SideThe following procedure explains how to setup synchronous leased lineoperation for an answer

Pagina 5

DIP Switch SetupDIP switches are a quick and easy way to setup leased line operation.Make sure that the modems jumpers are installed properly. This m

Pagina 6

Z32b-SX Modem9600bps 4-Wire Leased Line with Synchronous Data—Answer SideDIP SW1 ONDIP SW2 ONDIP SW3 ONDIP SW4 OFFDIP SW5 ONDIP SW6 ONDIP SW7 ONDIP SW

Pagina 7

Z34-SX Modem (14.4Kbps is the lowest speed supported with DIP switch)14400bps 4-Wire Leased Line with Synchronous Data—Answer SideDIP SW1 ONDIP SW2 ON

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