Specifications

4-54
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
DS3N-12E Card
• F-bit monitoring
• Far-end block errors (FEBE) monitoring
• Far-end alarm and control (FEAC) status and loop code detection
• Path trace byte support with TIM-P alarm generation
You can install the DS3N-12E card in any multispeed or high-speed card slot. Each DS3N-12E port
features DSX-level outputs supporting distances up to 450 feet. With the proper backplane EIA, the card
supports BNC or SMB connectors.
The DS3N-12E can operate as the protect card in a 1:N (N<
5) DS-3 protection group. It has additional
circuitry not present on the basic DS3-12E card that allows it to protect up to five working DS3-12E
cards. The basic DS3-12E card can only function as the protect card for one other DS3-12E card.
4.17.1 DS3N-12E Card-Level Indicators
The DS3N-12E card faceplate has three LEDs.
4.17.2 DS3N-12E Port-Level Indicators
You can find the status of the DS3N-12E card ports using the LCD screen on the ONS 15454 fan-tray
assembly. Use the LCD to view the status of any port or card slot; the screen displays the number and
severity of alarms for a given port or slot. See Chapter 1, “Alarm Troubleshooting” for a complete
description of the alarm messages.
4.17.3 DS3N-12E Compatibility
The DS3N-12E cards are compatible with Software R2.2.x or higher. If Software R3.0 or higher is used,
the DS3N-12E operates using all enhanced performance monitoring functions. With Software R2.2.2,
the DS3N-12E operates with the same functions as the older DS-3 card.
4.17.4 DS3N-12E Card Specifications
• DS3N-12E Input
– Bit Rate: 44.736 Mbps +/- 20 ppm
Table 4-28 DS3N-12E Card-Level Indicators
Card-Level Indicators Description
Red FAIL LED
The red FAIL LED indicates that the card’s processor is not ready. Replace
the card if the red FAIL LED persists.
ACT/STBY LED
Green (Active)
Amber (Standby)
When the ACTV/STBY LED is green, the DS3N-12E card is operational and
ready to carry traffic. When the ACTV/STBY LED is amber, the DS3N-12E
card is operational and in standby (protect) mode.
Amber SF LED
The amber SF LED indicates a signal failure or condition such as AIS, LOS,
or LOF on one or more of the card’s ports.