Cisco IGX 8 Specification Sheet page 4

Digital Data Service Interface
Ports per card:
Electrical Interface:
Interface Type:
Data Rates:
DDS Data Encoding:
Data Compression:
Synchronization Modes:
Control Codes Recognized: Idle.
Control Code Translation:
Alarm Code Translation:
Connector:
-4 IGX 8 Installation Manual, Release 8.2.0
Four.
Digital Data System (DDS)—AT&T Pub. 62310, November 1987.
DSU or OCU (software selectable).
2.4, 4.8, 9.6, 19.2, and 56 Kbps (software selectable).
Standard DDS Bipolar Return to Zero. Alternate Mark Inversion
coding with bipolar violation sequences for zero suppression and
control.
Repetitive Pattern Suppression (RPS): 7, 8, or 16 bit pattern
matching.
External (DSU only)
Looped (OCU only).
Zero Suppression.
Out-of Service.
Loopback Sequences.
Translation of RTS to IDLE.
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).
ISO 4903, female DB-15 type connector.