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Cisco ONS 15454 Reference Manual, R8.5
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Chapter 3 Electrical Cards
3.3 EC1-12 Card
BERT Alarms
The BERT feature can raise the following two alarms in CTC:
•
BERT_ENABL—Specifies that BERT feature is enabled.
•
BERT_SYNC_FAIL—Synchronization is necessary and occurs when the errors injected by the TPG
reach the TPM and connectivity is established. The BERT_SYNC_FAIL alarm occurs when
synchronization fails.
Both the alarms are non-reportable conditions, non-service affecting, and no severity is associated with
these two conditions.
3.3 EC1-12 Card
Note
For hardware specifications, see the
“A.5.1 EC1-12 Card Specifications” section on page A-17
.
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.
3.3.1 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.
3.3.2 EC1-12 Faceplate and Block Diagram
Figure 3-1
shows the EC1-12 faceplate and a block diagram of the card.
Содержание 15454-DS1-14= - 1.544Mbps Expansion Module
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