Digital Data Service Interface
Ports per card: | Four. |
Electrical Interface: | Digital Data System |
Interface Type: | DSU or OCU (software selectable). |
Data Rates: | 2.4, 4.8, 9.6, 19.2, and 56 Kbps (software selectable). |
DDS Data Encoding: | Standard DDS Bipolar Return to Zero. Alternate Mark Inversion |
| coding with bipolar violation sequences for zero suppression and |
| control. |
Data Compression: | Repetitive Pattern Suppression (RPS): 7, 8, or 16 bit pattern |
| matching. |
Synchronization Modes: | External (DSU only) |
| Looped (OCU only). |
Control Codes Recognized: Idle. | |
| Zero Suppression. |
| |
| Loopback Sequences. |
Control Code Translation: | Translation of RTS to IDLE. |
Alarm Code Translation: | Translation of the logical NOR of |
| Sync Fail. |
| Excessive Bipolar Violations. |
| No Signal to DSR (DSU only). |
| No Signal to DTR (OCU only). |
Connector: | ISO 4903, female |
