A-4
Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
AppendixA Technical Specifications
MGX 8230 Processor Switching Module Specif ications
LEDs on PXM front
card:
LEDs display status, but
alarm history is a switch.
Status for the card:
•Green means active.
•Red means failed.
•Yellow indicates the standby c ar d.
LAN activity: flashing gree n indicates activity.
Node alarm:
•Red indicates major alarm.
•Yellow indicates minor alarm.
Node power (note that each AC power supply also has an
LED):
•“DC OK A” is green for okay or red for trouble.
•“DC OK B” is green for okay or red for trouble.
Alarm history: ACO
Port interface (per port):
•Green means active and okay.
•Red means active and local alarm.
•Yellow means active and remote alarm.
•No light means inactive or not provi ded.
LEDs on back cards: Green means active. No light means inactive or not prov id ed .
Stratum 4
synchronization (internal
only):
8 KHz clock derived from:
•Internal 8 KHz cloc k (10 ppm).
Stratum 3
synchronization (internal
and external):
•Free-Run Accuracy of +/- 4.6 ppm (+/- 7 Hz @
1.544MHz)
•Holdover stability of les s than 255 slips (+/- .37 ppm ) for
the initial 24 hours of holdover.
•Upon clock switchove r, MT I E ( M a xi m u m Tim e I nt e r val
Error) shall not exceed 1 microsecon d. The rate of phase
change shall not exceed 81 ns in 1.326 ms interval.
•Pull-in range of ac curacy +/- 4.6 ppm.
•Provide jitter filtering and to le rate jitter according to
AT&T T1.5 and ITU G.824 specifications.
•Declare a bad reference if LOS detected >50 ms or er ro r
burst of duration >2. 5 sec.
BITS clock interface: T1 and E1 with an RJ-45 con ne cto r.
Note: older systems with a PXM-UI back card have an SMB
connector for E1.
TableA-2 PXM Specifications (continued)
Category Description