IPECS Release 5
Hardware Description & Installation
Issue 5.0
10
2.1.4 DIDM8 (DID gateway Module)
The eight (8)-port Direct-In-Dial gateway Module (DIDM8) provides interfaces to Direct-In-Dial
Lines, supporting wink or immediate start signaling. These special PSTN lines are incoming only
and send the last few digits of the dialed number to the DIDM8 identifying a particular
extension/user in the system.
The DIDM8 provides interface circuitry for eight (8) DID Lines. Each interface is equipped with
appropriate speech codec and compression functions, pulse and DTMF dial signal detection.
The DIDM8 includes a 10/100 Base-T Ethernet interface as well as packet voice processing
functions. The Ethernet port incorporates auto MDI, MDIX switching, therefore, both straight and
cross cables can be used.
As shown in Figure 2.1.4-1, the front panel of the DIDM8 has:
•
Power jack for the AC/DC adapter ;see section 2.1.15
AD/DC adapter –G-,,
•
Power status LED,
•
Normal/Service switch – In Service mode, circuits in use
are busied as they return to idle -,
•
RJ-45 Female LAN connector with Speed and Link/Activity
LEDs,
•
Eight (8) DID LEDs, one for status of each DID Line,
•
DB-9 RS-232 connector,
•
Reset
Switch.
On the rear panel, the DIDM8 has:
•
Eight (8) RJ-45 female connectors,
•
Ground
Lug,
•
Fifty (50)-pin back plane connector.
Figure 2.1.4-1 DIDM8 Front & Rear Panels