Cisco Systems 15454 3.2 EC1-12 Card

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Cisco ONS 15454 Reference Manual, R7.0
78-17191-01
Chapter 3 Electrical Cards
3.2 3.2 EC1-12 Card
3.2 EC1-12 Card
Note For hardware specifications, see the “A.5.1 EC1-12 Card Specifications” section on page A-15.
The EC1-12 card provides 12 Telcordia-compliant, GR-253 STS-1 electrical ports per card. Each port
operates at 51.840 Mbps over a single 75-ohm, 728A or equivalent coaxial span.
STS path selection for UNEQ-P, AIS-P, and bit error rate (BER) thresholds is done on the SONET ring
interfaces (optical cards) in conjunction with the STS cross-connect. The EC1-12 terminates but does
not select the 12 working STS-1 signals from the backplane. The EC1-12 maps each of the 12 received
EC1 signals into 12 STS-1s with visibility into the SONET path overhead.
An EC1-12 card can be 1:1 protected with another EC1-12 card but cannot protect more than one EC1-12
card. You must install the EC1-12 in an even-numbered slot to serve as a working card and in an
odd-numbered slot to serve as a protect card.
3.2.1 EC1-12 Slots and Connectors
You can install the EC1-12 card in Slots 1 to 6 or 12 to 17 on the ONS 15454. Each EC1-12 interface
features DSX-level (digital signal cross-connect frame) outputs supporting distances up to 450 feet
(137 meters) depending on facility conditions. See the “7.2 Electrical Card Protection and the
Backplane” section on page 7-5 for more information about electrical card slot protection and
restrictions.
3.2.2 EC1-12 Faceplate and Block Diagram
Figure 3-1 shows the EC1-12 faceplate and a block diagram of the card.