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Micro House PC Hardware Library Volume II: Network Interface Cards And Modems Micro House PC Hardware Library Volume II: Network Interface Cards And Modems
by Micro House International, Inc. and Scott Mueller
Que, Macmillan Computer Publishing
ISBN: 078971664x   Pub Date: 06/17/98
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SYNCH/ASYNCH MODE
Type: Register
Format: AT [cmds] S4=n [cmds]
Description: Selects whether the CSU/DSU is in synchronous or asynchronous mode.
Command Function
S4=0CSU/DSU is in asynchronous mode.
     S4=1 CSU/DSU is in synchronous mode.

TRANSMIT PROFILE
Type: Immediate
Format: AT [cmds] *Wn [cmds]
Description: Sends the current S-Register and switch settings to the remote CSU/DSU.

V.25bis FORMAT
Type: Register
Format: AT [cmds] S16=n [cmds]
Description: Selects bit- or byte-oriented dialing for V.25bis mode.
Command Function
S16=0Bit-oriented dialing.
     S16=1 Byte-oriented dialing.

Proprietary V.25bis Command Set

DIAL STORED NUMBER
Type: Immediate
Format: CRSnn
Description: Dials the number stored in memory location nn.

PATTON ELECTRONICS COMPANY

2703

Card Type E1 CSU/DSU
Chip Set Unidentified
Transfer Rate 2.048Mbps
Data Bus External

CONNECTIONS
Function Label Function Label
75 ohm coax line in or out CN1 120V or 230V AC power CN5
120 ohm shielded twisted pair CN2 Fuse for 120V: 250V @ 50mA
Fuse for 230V: 250V @ 32mA
F1
75 ohm coax line in or out CN3 Power switch SW1
V.35, V.36, or X.21 port via UD-26 CN4 Local analog loopback test switch SW2
Note: The information as to which coax connector is for transmit and which is for receive is unidentified.

USER CONFIGURABLE SETTINGS
Setting Label Position
Shield of transmit coax is not groundedLK1 Open
     Shield of transmit coax is grounded LK1 Closed
Shield of receive coax is not groundedLK2 Open
     Shield of receive coax is grounded LK2 Closed
Clock master mode disabledLK3 Open
     Clock master mode enabled LK3 Closed
Shield of twisted pair is not groundedLK4 Open
     Shield of twisted pair is grounded LK4 Closed
Auto-detect device connected to line inLK5 Closed
     Do not auto-detect device connected to line in LK5 Open
DSU is clock masterS1/1 On
     DSU is clock slave S1/1 Off
Loopback mode is enabled only by front panel switchS1/4 Off
     Loopback mode is enabled continually S1/4 On
Transmitted and received data are not invertedS1/5 Off
     Transmitted and received data are inverted S1/5 On
Power supply set for 230V operationSW3 Off
     Power supply set for 115V operation SW3 On
Note: Setting LK3 to Open overrides S1/1. When LK3 is closed, the DSU may still be set to Slave mode with S1/1.

LINE TERMINATION IMPEDANCE
Setting LK6 LK7
75 ohm Closed Closed
120 ohm Open Open

LINE SPEED
Setting S1/2 S1/3
256Kbps On On
512Kbps Off On
1.024Mbps On Off
2.048Mbps Off Off

CLOCK SOURCE
Setting S1/6 S1/7
External clock source On On
Internal clock source Off Off

SERIAL PORT TYPE
Setting S1/8 S5/1 S5/2 S5/3 S5/4 S5/5 S5/6 S5/7 S5/8
V.35 N/A On On On On On On On On
V.36 On Off Off Off Off Off Off Off Off
X.21 Off Off Off Off Off Off Off Off Off


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