Physical Layer & Transport

E1/T1 Timeslot Planner

Plan digital trunk configurations, calculate available bandwidth, and map timeslot assignments for E1 (2.048 Mbps) and T1 (1.544 Mbps) circuits.

Trunk Configuration

Generate a trunk map to see timeslot allocation.

Technical Architecture

E1 (ITU-T Standard)

Uses 32 timeslots of 64kbps each. TS0 is reserved for framing/sync. In CAS mode, TS16 is reserved for signaling, leaving 30 channels for voice/data (PCM30).

T1 (ANSI Standard)

Uses 24 timeslots. Framing bits are added every 192 bits. Commonly used in North America and Japan with ESF/B8ZS for clear channel 64kbps.

Trunk_Signaling_Standards

PCM and framing logic according to ITU-T and ANSI recommendations for primary rate interfaces.

•ITU-T G.703: Physical/electrical characteristics of hierarchical digital interfaces

•ITU-T G.704: Synchronous frame structures used at 1544, 6312, 2048, 8448 and 44 736 kbit/s hierarchical levels

•ANSI T1.102: Digital Hierarchy - Electrical Interfaces

Quick Reference

DS0 Rate

64 kbps

DS1 Rate

1.544 Mbps

E1 Rate

2.048 Mbps

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