Lucent Technologies DDM-2000 OC-3 Installation Manual Download

Page: 62 / 492

1-4 Issue 9 October 1998

363-206-204
Introduction

48 V fuses, EIA-232D port for connection with a craft interface terminal (CIT), and
an electrostatic discharge (ESD) grounding jack.

The SYSCTL circuit pack is located immediately to the left of the user panel. This
circuit pack is always needed and provides the functions required for the shelf’s
basic operation (that is, provisioning, monitoring, protection switching, and serial
telemetry).

The faceplate of the SYSCTL circuit pack has a 7-segment display as well as far
end select (FE SEL) and update/initialize (UPD/INIT) push-buttons.

The slot to the left of the SYSCTL circuit pack is equipped with an OHCTL. The
OHCTL circuit pack provides supplementary functions to the SYSCTL circuit
pack.

The DS1 circuit packs (low speed units) are located to the left of the OHCTL slot.
The DS1 circuit packs, consisting of seven service packs and one protection pack,
are arranged in groups of eight for each function group. Each DS1 circuit pack
accommodates the multiplexing/demultiplexing of four DS1s into and out of a
synchronous optical network (SONET virtual tributary-group (VT-G) signal. If DS1
circuit packs are used, MXRVO circuit packs are required. If DS1 protection is
desired, all DS1 service slots in that function group must be equipped with DS1
circuit packs or 177A retainers.

The six slots located to the left of the DS1 slots are Function Unit slots. In
Releases 6 and 8 the Function Unit slots can accommodate all circuit packs from
previous releases and adds the STS-1E Circuit Pack. In Releases 7, 9, 11 and 13
the Function Unit B and C slots also can accommodate OLIU circuit packs. In
Releases 11 and 13 the Function Unit slots are able to accommodate the OLIUs
that enable interoperation with an OC-12 ring.

For each function group equipped with DS1 circuit packs, two MXRVO circuit
packs are to be equipped in the appropriate positions if protection is desired. The
MXRVO circuit pack multiplexes/demultiplexes the VT-Gs from/to the DS1 circuit
packs into and out of an STS-1 signal. If DS3 service is desired, DS3 circuit packs
are equipped in the appropriate function unit positions, and the associated DS1
slots must remain unequipped. The DS3 circuit pack provides a mapping of an
incoming DS3 signal to an STS-1 signal. The STS-1E circuit pack takes an STS-1,
composed of either DS1 or DS3 service, and provides a high or low speed
interface to the DACS IV-2000 or FT-2000.

Located to the left of the function units are the optical line interface unit (OLIU)
regenerators. The OLIU multiplexes the STS-1s into an STS-3, and then converts
the STS-3 into an OC-3, or, in the case of Releases 11 and 13, an OC-12 optical
signal for transmission onto the fiber. The reverse is performed in the demultiplex
direction.

Located to the left of the OLIUs, at the far left side of the shelf, are the timing
generator (TGS) circuit packs. The TGS circuit packs, which are always required,
provide timing for the shelf and allow the DDM-2000 OC-3 to become part of a
synchronous network. TGS circuit packs that provide external timing are available.
Only one TGS circuit pack is required, and may be used in either slot, if protection
is not desired.

Lucent Technologies DDM-2000 OC-3, Installation Manual

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