Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 18)

System Information
2-2 Verilink Access System 2000: The Basics
Figure 2-1 AS2000 Shelf Units
Data Bus
Structure
The MLS and DLS shelf units have three data buses: A, B, and C.
These data buses are used for:
• Transferring data between Data Service Units (DSUs) and
Channel Service Units (CSUs).
• Operating in drop-and-insert mode (data from different DTE
are multiplexed into a T1, FT1, E1, T3, etc.).
• Operating in mini-digital cross-connect switch mode (data
switches between DTE and network ports on channel level 0
basis).
All three data buses on the MLS and DLS shelves can be expanded to
another shelf using a data bus extension cable. When using the
MLS 2200 and MLS 2200-4i, only the last data bus segment (A4 or
Multi-line Shelf
Quint-line Shelf
Dual-line Shelf
ACCESS SYSTEM 2000