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-4 IGX 8 Installation Manual, Release 8.2.0

Digital Data Service Interface

Ports per card: Four.

Electrical Interface: Digital Data System (DDS)—AT&T Pub. 62310, November 1987.

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.

Out-of Service.

Loopback Sequences.

Control Code Translation: Translation of RTS to IDLE.

Alarm Code Translation: Translation of the logical NOR of Out-of-Service

Sync Fail.

Excessive Bipolar Violations.

No Signal to DSR (DSU only).

No Signal to DTR (OCU only).

Connector: ISO 4903, female DB-15 type connector.

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Cisco Systems IGX 8 Spezifikationsblatt Seite 4