Nortel Meridian Meridian 1 Feature Description And Administration page 1812

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Figure 189
Remote loopback tests (NT6D80)
Switch A
DCH Handler
MSDL Handler
Meridian 1 Interface Module
MSDL DCH Software Module
Physical Layer (Layer 1) Handler
553-2901-301 Standard 9.00 January 2002
Service verification
Meridian 1 Software
DCH
MSDL
Port
DCH or ISL link
Meridian 1
CPU Bus
MSDL card
Meridian 1 Interface Module
software
MSDL DCH Software Module
Physical Layer (Layer 1) Handler
Lockback path
Switch B
DCH
DCH Handler
MSDL Handler
MSDL
Port
553-5437