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CEC
AMD 29000 RISC main processor
CEC - 25MHz, 12MB total, 4 MB data memory, 4 MB instruction
memory, and 4 MB shared (packet) memory
CEC 20 - 25 MHz 20MB total, 8 MB data memory, 8 MB instruction
memory, and 4 MB shared (packet) memory
AMD 29040 RISC main processor
DPE 40 - 50 MHz 32MB/16MB The DPE 40 cannot be upgraded to a DPE
80 (?)
DPE 80 - 50 MHz 64MB/16MB
DPE plus 62.5 MHz 64MB/16MB
DPE 40 32 MB (upgradeable to 64 MB) of instruction and data
memory and 8 MB of shared (packet) memory.
16 MB 72-pin SIMMs can be upgraded by installing two 32 MB
SIMMs. SIMMs in pairs of equal-sized memory.
DPE plus 64 MB of instruction and data memory and 16 MB of
shared (packet) memory
Obtain a cable to connect the device to the CONSOLE port on the
front panel of the main processor module.
AUXILIARY connector DE9 Reserved for internal 3Com
use and is not operational.
DIAGNOSTIC connector DE9 Reserved for internal 3Com use and is
not operational.
Console pinouts on the CEC20 module front panel.
CONSOLE Connector Pin Assignments
Pin No. Function
1 Carrier detect
2 Receive data
3 Transmit data
4 Data terminal ready
5 Signal ground
6 Data set ready
7 Request to send
8 Clear to send
9 Ring indicator
9-pin to 9-pin PC Cable (Null Modem-Type) pinouts for a 9-pin
female to 9-pin female PC cable. A null modem-type cable can be used.
9-pin to 25-pin Terminal Cable (Null Modem-Type) pinouts for a
9-pin female to 25-pin male or female terminal cable. A
null modem-type cable can be used.
9-pin to 25-pin Modem Cable (Straight-Through-Type) pinouts for
a 9-pin female to 25-pin male modem cable. A straight-through-type
cable can be used.
CONSOLE Port Configuration Settings
| Characteristic |
Setting |
| Baud rate |
9600 |
| Databits |
8 |
| Parity |
None |
| Stop bits |
1 |
| DTR |
Ignored |
| Duplex |
Full |
| Echo |
Off |
| Flow control |
X-on/X-off |
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