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Triple DS3/STS-1 I/O Front Module
Plexus 9000 Planning and Engineering Guide
Issue 2, March 26, 2004
Section 130-120-500
5-134
Telica,
Inc.
5.11.2
Functional Description
The Plexus 9000 accommodates up to 17 IOMs. The triple DS3 IOM can
terminate 3 DS-3s, which are equivalent to 84 DS-1s. These interfaces
support SS7 and ISDN protocols. The line side, which can terminate 3
DS-3s, converts DS-3s to ATM cells and sends them to the SF module.
The 89-0365 IOM can be used in an 85-3000 chassis. When it is used in
an 85-3000 chassis, the rear protection module will always be a triple DS3
protection IOM.
The Triple DS-3 IOM with a part number of 89-0397 or greater requires a
Plexus 9000 chassis 85-3004 or 85-3007. DS-3 IOMs can be installed in
I/O-1 to I/O-17 (physical slots 1-8, 11 and 14-21). The system’s ability to
allow any line interface module to occupy any I/O slot, along with the 1:N
protection capability, prevents the loss of valuable shelf space.
The system features 1:N protection of the DS3 line interface modules.
The same front module type is used for both working and protection
applications, thus simplifying sparing, maintenance and inventory.
In the 85-3000 chassis, slot 11 is the DS-3 protection module slot and
slot 7 is the recommended DS-1 protection slot. If the user does not desire
to protect line- and trunk-side interfaces, the system can be equipped with
17 interface modules.
In the 85-3004 or 85-3007 chassis, I/O-5 (physical slot 5) and IOM-13
(physical slot 17) are the DS-3 protection module slots and IOM-7
(physical slot 7) is the recommended DS-1 protection slot. I/O-5 protects
I/O-1 to I/O-4 and I/O-6 to I/O-8; I/O-13 protects I/O 9 to I/O-12 and
I/O-14 to I/O-17. I/O-7 when used for DS-1 protection provides
protection for DS-1 IOMs in any slot. As in the 85-3000 chassis, the
system can be equipped with 17 interface modules with no protection.
The front Triple DS-3 IOMs require rear modules for physical interface
terminations. The associated rear modules feature two (2) BNC
connectors (transmit and receive), per DS-3 or STS-1 for a total of six
connectors. The rear protection module does not have any connectors.
5.11.2.1
General Mechanical Representation
The DS-3 IOM is approximately 14 inches high and plugs into the
midplane for connections to the rear IOM and to the SF and SP modules.
See
for an illustration of the midplane connector, the DS-3
IOM and the front of the module. Labeling on the module may differ with
part numbers. Refer to
for a description of the LEDS.