Verilink AS2000: The Basics (880-502981-001) Product Manual - Manual (Page 24)

System Information
2-8 Verilink Access System 2000: The Basics
AS2000 Modules
Through its modular design, the AS2000 hosts a variety of
applications. Application modules use TABS or Verilink’s ACP-
based protocol. The application modules plug into the front of a
shelf unit and mate with the CIM. In the following sections, the
available operating modes for each CSU are shown in parentheses.
TABS-Based
Application
Modules
The following TABS-based application modules are used in the
AS2000 system:
Table 2-2 TABS-based Application Modules
TABS-Based
Controller Modules
The following TABS-based application modules are controller
modules. They reside in shelf 1, slot 1 of a TABS-based node.
Table 2-3 TABs-based Controller Modules
Module Function
DIU 2130 A high-speed T1 DSU with two ports, each carrying 1 to 24
DS0s. Multiple DIU 2130s can be configured to one CSU,
maximizing T1 timeslot usage.
DIU 2131 This DSU multiplexes a high-speed V.35 application with a
low-speed RS-232 application (up to 64 kbit/s on T1).
DIU 2140 A sub-rate data multiplexer low-speed T1 DSU, with five RS-
232 ports operating from 300 bit/s to 19.2 kbit/s. Data can
be synchronous or asynchronous.
TAC 2010 A T1 CSU, 1 to 24 channels (CSU, D&I, MUX).
TAC 2130 An integrated T1 CSU/DSU with standard network and DSU
ports (MUX).
TIU 2850 The Timing Interface Unit connects an external reference
clock signal to a CSU, synchronizing it with the associated
DSUs. This module only works with TABS-based CSUs,
including NCC, SCC, TAC.
Module Ability
NCC 2020 A node controller and CSU module that includes a T1 CSU.
This unit can manage up to 30 modules in a node (CSU, D&I,
MUX).
NCC 2130 This node controller includes an integrated T1 CSU/DSU and
can manage up to 30 modules in a node (MUX).