Asynchronous adapters
The standard, 8-port, and 16-port asynchronous adapters that are listed in this table.
The following table summarizes these products:
| Asynchronous Attachment | Bus Type | Feature Code or Machine Type (Model) | Maximum Data Rate per Port (KBits/sec) | Salient Features |
|---|---|---|---|---|
| 8-Port EIA 232 | Micro Channel | 2930 | 76.8 | Pervasive standard |
| 8-Port EIA 422A | Micro Channel | 2940 | 76.8 | Greater distance |
| 8-port MIL-STD 188 | Micro Channel | 2950 | Selectable based on baud rate generator clock speed of UART. | MIL-STD 188-114 for unbalanced voltage digital interface |
| 8-port EIA 232 | ISA | 2931 | 115.2 | Greater efficiency |
| 8-port EIA 232 | ISA | 2932 | 115.2 | Greater efficiency |
| 8-port EIA 422 | PCI | 2943 | 230 | Greater efficiency |
| 16-Port EIA 232 | Micro Channel | 2955 | 76.8 | Local connection focus |
| 16-Port EIA 422A | Micro Channel | 2957 | 76.8 | Greater distance |
| - | ISA | 2933 | - | - |
| - | PCI | 2944 | - | - |
The following table shows the detailed product characteristics.
| Native Serial Ports | 8-port | 16-port | 128-port with RAN | |||
|---|---|---|---|---|---|---|
| MC | ISA | MC | ISA | |||
| Number of asynchronous ports per adapter | n/a | 8 | 8 | 16 | 128 | 128 |
| Maximum number of adapters | n/a | 8 | 7 | 8 | 7 | 7 |
| Maximum number of asynchronous ports | 2 or 3 | 64 | 56 | 128 | 896 | 896 |
| Number of asynchronous ports per RAN | n/a | n/a | n/a | n/a | 16 | 16 |
| Maximum number of RANs | n/a | n/a | n/a | n/a | 56 | 56 |
| Maximum speed (KBits/sec) | Selectable based on baud rate generator clock speed of UART. | 76.8 | 115.2 | 76.8 | 230 | 230 |
| Attachment method | standard | direct | direct | direct | node | node |
| Asynchronous electrical interfaces supported | EIA 232 | EIA 232 EIA 422A4MIL-STD4188-1144 | EIA 232 EIA 422A | EIA 232 EIA 422A | EIA 232 EIA 422 | EIA 232 EIA 422 |
| Standard connector | DB25M/ MODU | DB25M | DB25M | DB25M | RJ-452 | RJ-452 |
| DB25 cable options | n/a | n/a | n/a | n/a | RJ-45-DB25 | RJ-45-DB25 |
| Rack mount option | n/a | n/a | n/a | n/a | yes | yes |
| Power supply | n/a | n/a | n/a | n/a | external | external |
| Signals supported (EIA 232) | TxD RxD RTS CTS DTR DSR DCD RI | TxD RxD RTS RTS CTS DTR DSR DCD RI | TxD RxD RTS CTS DTR DSR DCD RI | TxD RxD RTS3-DTR -DCD - | TxD RxD RTS CTS DTR DSR DCD RI | TxD RxD RTS CTS DTR DSR DCD RI |
Note:
- Socket accepts 8p RJ-45, 6p RJ-11, or 4p RJ-11 plugs with a reduction in signals supported.
- RTS is tied high (+12V) in the fanout connector box of the 16-port interface cable EIA 232 (FC 2996).
- Micro Channel Only.
Each product offering is characterized by a representative scenario for its strengths. The following are recommendations for each: