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primary and secondary set of two separate clock signals; a composite (64KHz) clock signal
and a high speed (2.048Mhz or 1.544Mhz) clock signal.
The section provides information about the High‑Speed Source Timing feature and
instructions on how to implement the feature. Procedures include the replacement of the
composite clock cables.
Note:
This feature does not cover the replacement of the control shelf, the control shelf
backplane, or an EAGLE software upgrade. For these items, contact
Support (MOS)
for assistance.
Source Timing Overview
The High‑Speed (HS) Source Timing feature offers a mode of operation that allows a high
speed capable (T1 or E1 rate) Link Interface Module (LIM‑ATM) or E1/T1MIM installed in an
EAGLE STP to receive its transit timing reference directly from an external HS Source clock
source, instead of slaving to the timing information contained in the received data. The timing
information is then encoded into the T1 or E1 transmitted data stream used to synchronize
downstream equipment. The site clock sources (both HS and composite) are connected with
an RS422 compatible cable to the primary and secondary clock inputs of the EAGLE STP.
The high‑speed Source clock source provides the EAGLE STP with a second system clock
input in addition to the original composite clock. Timing signals from both system clocks is
distributed within the EAGLE STP to all LIM card slots.
The HS Source Timing feature is integrated into the EAGLE Control Card set.
Implementation of the HS Source Timing feature might require the correct Control Card set,
the installation or presence of at least one ATMLIM card or E1/T1MIM, the replacement of
both composite clock cables or adding new cables, and the provisioning of at least one
ATMLIM card or E1/T1MIM. ATMLIM cards or E1/T1MIM that do not use the high‑speed
clock source and LIM cards that continue using the composite clock source do not require
any changes to card provisioning.
OAP terminals must be inhibited before replacing the Control Card set for the HS Source
Timing feature to ensure that no OAP updates are inadvertently sent to the database during
the implementation.
The composite clock cables connect the site's composite (BITS) clocks with the EAGLE STP
control shelf. Implementation of the HS Source Timing feature requires the replacement of
both composite clock cables with two new HS Source clock cables (RS422 compatible) on
control shelf backplane (P/N 850‑0330‑06 or ‑07 and later).
Only ATMLIM cards or E1/T1MIM can be configured or re‑configured for the HS Source
Timing feature. Once the baseline hardware requirements for the HS Source Timing feature
have been met, see the
Source Timing Feature Requirement
Caution:
These are redundant systems to allow service during normal maintenance. When
repairs require a total power disconnect, both input supply sources must be
disconnected. This will cause service interruption and takes down the systems.
Chapter 6
Source Timing
My Oracle
Matrix, install the cards.
6-53
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