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.

-4IGX 8 Installation Manual, Release 8.2.0

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Cisco Systems IGX 8 appendix Digital Data Service Interface

IGX 8 specifications

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