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D/I Mux III Common Equipment
Options
Common equipment units are the essentials of every multiplexer.
They control the system, perform the multiplexing function, and
interface to the T1 transmission lines. A D/I Mux III must have
either a Common Control Unit (CCU) or an Advanced Multiplexer
Control Unit (AMCU), two Line Interface Units (LIUs), a Dual DSX-1
or Dual CSU Interface, Strobe cards (upper and lower strobe cards
for the 24-slot shelf), and a power supply. These are the units
common to every system, and they reside in specific shelf card
slots.
Common Control Unit (CCU) and (AMCU)
The Common Control Unit (CCU) -- and most recent upgrade, AMCU
-- stores the operating parameters for control and monitoring
of all common equipment and channel cards in the D/I Mux III.
The primary functions of the CCU are:
- Provide an interface for an asynchronous terminal or network
management system
- Control and monitor other common equipment and channel cards
- Manage all alarm functions
- Control T1 clock selection
- Control alarm cutoff (ACO) and bypass (BYP) functions
- Provide a date and time clock (“real time” clock)
- Provide nonvolatile storage of the shelf configuration Click
here for more detail about the AMCU
Power Supply Options
Power Supply -48 VDC Redundant
DC-to-DC converter used to power D/I Mux equipment from an external
-48 VDC input supply. Generates +/-12 and +/-5 volt outputs as well
as failure alarm signals. Also provides primary (-48v) power fusing.
Can be used in a redundant or load sharing configuration when two
power supplies are installed. When configured with FXS cards order
modular Ring Generator 30333-101. Can be used in an 8/12/24 slot
chassis. Replaces 30338-102.
Power Supply 120 VAC
An AC/DC self-contained single-slot power supply that provides all
of the voltages necessary to operate a D/I Mux III - except ringing
voltage. When configured with FXS feature cards, order modular Ringing
Generator 30333-101. Provides +/-12, +/-5, and -48. Can be used
in 8, 12 and 24-slot shelves. Replaces a 30308-102A and the combination
option of 30315-105A with 30338-103A. Cannot
be used in combination with any other power supply.
Line Interface Units
A & B (LIUs)
The LIUs interface to the network connection point (T1 Interface).
This unit supports software selection of the line coding, and operates
in one of three modes: looped timing, internal timing, and external
timing. Both LIUs are required for the D/I Mux III to operate in
standard channel bank configuration. Coastcom offers two types of
LIUs, one for standard Channel Bank Drop-and-Insert & Dual Channel
Bank, one of which is ALPS specific. Automatic Loop Protection System
(ALPS)
In the event of a line failure, ALPS heals your network automatically
without external network management control. Using counter rotating
ring technology, it creates an inner and an outer loop. When a T1
link fails, ALPS switches service from the outer loop to the inner
loop. The common equipment necessary for ALPS is Coastcom's Advanced
LIU and an Advanced CCU or MCU.
Dual
CSU
Used when T1-1 is connected to the network and T1-2 is connected
to a PBX or a DSX-1 interface on microwave, fiber, higher order
multiplexer or DCS. Provides CSU loop backs and automatic repeated
bypass during system alarm. Equipped with full bantam jackfield.
There are three versions of Dual Channel Service Unit (CSU) interfaces
available: T1/DSX-1, T1/T1, and DSX-1/DSX-1. Each CSU provides slightly
different options and capabilities for equalizing output across
twisted-pair cable. This process is called line build-out (LBO).
This is required to compensate for the characteristics of the twisted-pair
cable so that the correct signal level and shape is received at
the DSX-1.
With the T1/DSX-1 version, LBO is provided on the T1-1 (network)
side, and an equalizing network is provided on the DSX-1 (terminal)
side. This version can be used, for example, between a T1-2 network
and a digital PBX.
The T1/T1 version provides line build-outs on both sides as well
as on both T1-1 and T1-2 to interface to T1 carriers. This version
is used in drop-and-insert or dual channel bank applications.
The DSX-1/DSX-1 version provides DSX equalization on both sides.
This version is
for private networks which require T1 test capabilities. DSX-1 interfaces
work well with transmission equipment such as microwave radios and
fiber optic modems.
Other Equipment
Other standard common equipment includes a variety of T1 Interfaces,
power supply units, and strobes, and optional Facility Data Link
Communications Unit (FDL).
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