ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 58)

4. System Components
MSAP2000 Technical Manual V3.0 4-7
shelf’s EPM. The ELM’s Digital Cross Connect function can link
any subscriber channel within the System to the extension shelf.
When there are not enough slots in the main shelf, the ELM can
be used as a system extension shelf.
EPM
The Expansion Processing Module’s (EPM) function is to provide
connection to the ELM within the Main Shelf, and it can be placed
within slots 19 or 20 of the extension shelf. The EPM’s Digital
Cross Connect function will transmit the extension shelf data over
to the Main shelf.
MLTM
The Metallic Line Testing Module (MLTM) connects the subscriber
to the Helpdesk via public Network, or Digital Leased Lines. The
MLTM first receives commands and messages sent from the
Helpdesk, then test the subscriber line within the carrier system,
and send the test results back to the Helpdesk.
V5P
V5P is a V5.2 Protocol Processing Module, which supports ITU-T
G.964, G.965 standards.