Cisco Systems IGX 8 Manual De Usuario
-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.
coding with bipolar violation sequences for zero suppression and
control.
Data Compression:
Repetitive Pattern Suppression (RPS): 7, 8, or 16 bit pattern
matching.
matching.
Synchronization Modes:
External (DSU only)
Looped (OCU only).
Looped (OCU only).
Control Codes Recognized: Idle.
Zero Suppression.
Out-of Service.
Loopback Sequences.
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).
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.