Specifications

Cisco ONS 15454 Product Overview, R3.3

May 2002

Cisco ONS 15454 Product Overview

Timing

Figure 30 ONS 15454s and ONS 15327s in a mixed conﬁguration

(subtended ring)

Timing

The TCC+ card performs all system-timing functions for each ONS 15454. The

TCC+ card selects a recovered clock, a BITS, or an internal Stratum 3 reference

as the system-timing reference. You can provision any of the clock inputs as a

primary or secondary timing source. If you identify two timing references, the

secondary reference provides protection. A slow-reference tracking loop allows

the TCC+ to synchronize to the recovered clock, which provides holdover if the

reference is lost.

ONS 15454

Path Protection or BLSR

Path Protection

ONS 15327

OC-12 or OC-48

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