Confidential Page 2 10/27/98
The
FAQ
About the 2800
Q: What kind of data connections does the 2800 support?
A: The 2800 series can supports the following types of connections:
Q: What hardware options are there?
A: The only hardware option available for the 2800 are two DSP daughter boards. The base unit
(Model 2800) comes standard with 12 DSP’s. To expand the modem capacity of a Model 2800 you
can a daughter board. There are two versions of this daughterboard. One has 12 DSP’s and the
other 18 DSP’s. Adding a 12 DSP daughterboard to a Model 2800 will give it the capacity of a
2810. Adding an 18 DSP daughter board to a Model 2800 will give it the capacity of a 2860.
Patton also has a 120Ω to 75Ω balun for connecting the 2800 to coax E1 lines.
Q: What is a digital modem and how many can the 2800 support?
A: The 2800 is a pure digital device. There is no analog processing in the 2800. The DSP’s are best
thought of as communications processors. At ring time, the 2800 is told what type the incoming call
is – analog or digital – and then loads the correct program into the DSP’s. The information from the
phone call is a digital representation of an analog voice call. The DSP’s process this digital
information without conversion back to analog. This allows the modem to function consistently,
accurately and error-free every time.
Q: How are DSP’s allocated?
A: The DSP’s are best thought of as a resource pool. At ring time the 2800 is told by the calling switch
whether the call is digital or analog. At that time a DSP is allocated and assigned to that call. The
way the DSP’s are kept in the resource pool and allocated is in a Round-Robin fashion.
Q: How is the switching fabric for the DSP’s organized?
A: There is no switching fabric in the 2800. There is a 4-wire interface from the line termination
interface which contains all of the TDM information from the T1/E1/PRI line. All the DSP’s listen to
this TDM highway. This allows each DSP to process any call on any channel. The benefit to this
design is that if a DSP fails it will not take down a channel or possibly a whole T1/E1/PRI line.
Q: What kind of management support do you have?
A: The 2800 supports an out-of-band RS-232 VT-100 console port, TELNET, HTTP (through our own
embedded web server), and SNMP. The 2800 is based on SNMP. On top of the SNMP engine is
our own embedded HTTP web server. This allows configuration and management using a
standard web browser without having to purchase HPOpenview. All of the configuration options
are available through the web server interface.
Q: Can I access all of the configuration options via the WEB interface?
A: YES. All of the configurable options in the 2800 are accessible through the web interface.
Q: Is the HTTP interface a separate application on another system?
A: No. The HTTP/HTML server is built into the 2800 and not a separate system.
ASCII
Async PPP
Sync PPP
V.120 / V.110
Frame Relay
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