Specifications

4-35
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
EC1-12 Card
4.11 EC1-12 Card
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. Figure 4-13 shows the
EC1-12 faceplate and a block diagram of the card.
Figure 4-13 EC1-12 faceplate and block diagram
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.
You can install the EC1-12 card in any multispeed or high-speed card slot on the ONS 15454. Each
EC1-12 interface features DSX-level (digital signal cross-connect frame) outputs supporting distances
up to 450 feet depending on facility conditions.
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.
Line
Interface
Unit
main STS1
protect STS1
STS-12/
12xSTS-1
Mux/Demux
ASIC
BTC
ASIC
STS-1
Framer
x12
61344
B
a
c
k
p
l
a
n
e
FAIL
ACT/STBY
SF
EC1
12