Table C-2, Modem ± DTE Connection, Table C-3

COMSPHERE 3800Plus Modems

	Table C-2
	Modem ± DTE Connection

Symptom	Action

Modem does not accept or echo back	Verify that the cable between the Async port of the DTE and the modem is a
AT commands	standard RS-232 cable. If the cable is bad, replace it. (Null modem cables,
	also known as crossover cables, do not work in this application.)
	Verify that the Command Echo Character configuration option is enabled.
	Refer to Line Dialer in Chapter 8, Configure Branch, or ATE command in
	Chapter 13, AT Commands and S-Registers.
	Verify that the DTE Dialer Type configuration option is set to AT. Refer to DTE
	Dialer in Chapter 8, or the AT&M or AT&Q command in Chapter 13.
	Verify that the Result Codes configuration option is enabled. Refer to DTE
	Dialer in Chapter 8, or the ATQ command in Chapter 13.
	Reload the Async Dial factory configuration area to guarantee that all
	configuration options are returned to their proper setting.
	Make sure that all AT commands are terminated with a carriage return.
	Verify that the ASCII value of a carriage return matches what is used by the
	DTE and the modem. Refer to DTE Dialer in Chapter 8 or the S3 register in
	Chapter 13. Verify that the DTE has a valid character format. Valid format
	consists of 8 data bits with no parity or 7 data bits with even, odd, mark or
	space parity.
	Verify that your equipment can support the DTE data rate. Refer to Async
	DTE Rate configuration option, DTE Interface in Chapter 8.
	If using a PC, verify that the modem is attached to the correct
	communications port.

	Table C-3
	(1 of 2)
	Modem ± VF Connection

Symptom	Action

Modem does not receive a dial tone	Attach the telephone directly to the wall outlet to verify that a dial tone exists.
	Make sure the VF line is connected to the modem's rear jack labeled Dial.

Modem does not go off-hook and answer	Verify that the Auto-Answer Ring Count configuration option (S-Register 0) is
an incoming call	set to a value other than 0 (disable).
	Verify that the DTE is providing DTR to the modem.
	If the DTE does not provide DTR to the modem, verify that the modem's DTR
	Action configuration option is set for Ignore. Refer to DTE Dialer in Chapter 8.
	Verify that all cables are attached to the correct connectors on the rear of the
	modem.

C-2

November 1996

3980-A2-GB30-20

3800PLUS specifications

The Paradyne 3800PLUS is a sophisticated networking device designed for various applications in high-demand environments, such as telecommunications and enterprise networks. This versatile solution is well-regarded for its robust performance, providing reliable and efficient connectivity for businesses and service providers.

One of the standout features of the Paradyne 3800PLUS is its ability to deliver high-speed data transmission. Supporting multiple protocols, it ensures seamless connectivity for data, voice, and video over the same infrastructure, reducing the need for multiple devices and simplifying network management. The device is capable of supporting both synchronous and asynchronous data formats, making it suitable for diverse networking needs.

With its advanced multiple service options, the Paradyne 3800PLUS supports various connection types, including T1, E1, and DSL, allowing it to adapt to different local area network (LAN) settings. This flexibility makes it a preferred choice for organizations that require support for both legacy systems and modern technologies. Furthermore, the device offers built-in support for various network management protocols, such as SNMP, simplifying monitoring and configuration.

Security is a significant concern in today's networking landscape, and the Paradyne 3800PLUS addresses this with integrated security features that help ensure data integrity and privacy. The device supports encryption and authentication techniques, which protect against unauthorized access and safeguard sensitive information transmitted over the network.

The Paradyne 3800PLUS is also designed with ease of use in mind. Its web-based interface simplifies configuration and management, making it accessible for network administrators regardless of their technical expertise. Additionally, the device is equipped with diagnostic tools and indicators that facilitate troubleshooting, enabling quicker resolution of connectivity issues.

In terms of scalability, the Paradyne 3800PLUS can accommodate the growing needs of businesses and service providers. Its modular design allows for easy upgrades and the addition of new features, ensuring that the network infrastructure can evolve with changing demands.

In summary, the Paradyne 3800PLUS stands out as an advanced networking solution known for its high-speed capabilities, support for various protocols, integrated security measures, user-friendly management interface, and scalability. These characteristics make it an ideal choice for organizations seeking a reliable and efficient networking solution to enhance their operations and support future growth.

Paradyne 3800PLUS manual Table C-2, Modem ± DTE Connection, Modem ± VF Connection, Table C-3

Models: 3800PLUS

COMSPHERE 3800Plus Modems

Table C-2

Modem ± DTE Connection

Symptom

Chapter 13, AT Commands and S-Registers.

Table C-3

Modem ± VF Connection

Symptom

3980-A2-GB30-20

3800PLUS specifications