Specifications

ELMo 120 Multiplexer maintenance
3-3
Revision 2.01 ELMo 120 Multiplexer Installation and Maintenance Guide 08-01023-01
Maintenance checklists
This section contains the maintenance checklists for resolving EtherLoop
service problems.
Voice and data connectivity maintenance in facility room
Problem Maintenance Check
No voice or data service
• Verify that the correct Tip/Ring pairs are
being tested for both voice and data
• Verify power at all points in the system
• Check jumper connections at all cross-
connects
• Verify connections and wiring conditions at
all points
Voice but no data service
• Verify that the correct Tip/Ring pairs are
being tested for both voice and data
• Check jumper connections
• Check LEDs at intermediate hub or YesWare
Server/router connections
• Check for 10Base-T cable damage
• Verify that Modem card is present in correct
slot and fully seated in ELMo 120 backplane
connection
• Replace Modem card to check for bad card
• Verify that Ethernet Switch card is present in
correct slot and fully seated in ELMo 120
backplane connection
• Replace Switch card to check for bad card
Data but no voice service
• Verify that the correct Tip/Ring pairs are
being tested for both voice and data
• Check jumper connections at PSTN/PBX
cross-connect
• Check dialtone at the PSTN/PBX cross-
connect to verify that there is not an external
voice network problem
• Verify that Filter card is present in correct slot
and fully seated in ELMo 120 backplane
connection
• Replace Filter card in ELMo 120 shelf to
check for bad card