Specifications

2-6 DIDM2 & DIDU2
Chapter 2 - System Components
DIDM2 & DIDU2
The two port Direct-In-Dial gateway Module (DIDM2) provides interfaces to PSTN
Direct-In-Dial Lines, supporting wink or immediate start signaling. These lines are
incoming only and send the last few digits of the dialed number to identify a particular
extension/user in the system.
The DIDM2 provides interface circuitry for two DID Lines. The DIDM2 can be expanded
with the DIDU2 to provide four interface circuits in total. Each interface is equipped with
appropriate speech codec and compression functions, pulse and DTMF dial signal
detection.
The DIDM2 includes the Ethernet port and MAC for the 10/100 Base-T Ethernet interface
as well as packet voice processing functions.
Front Panel
Front PanelFront Panel
Front Panel
The front panel of the DIDM2 has:
Rear Panel
Rear PanelRear Panel
Rear Panel
On the rear panel, the DIDM2 has:
Figure 2-3: DIDM2 Front & Rear Panels
Power jack for the AC/DC adapter supplied
with the DIDM2
Power status LED
Normal/Service switch – in the Service
mode, circuits in use are busied as they
return to idle
RJ-45 Female LAN connector with Speed
and Link/Activity LEDs
Four DID LEDs, one for status of each DID
Line
One DIDU LED, indicating the two-port
expansion module (DIDU2) is installed
DB-9 RS-232 connector
Reset Switch
Four RJ-11 female connectors, one for
each DID Line (w/DIDU2 installed)
Ground Lug
50-pin back plane connector. All signals on
RJ-11 connectors are matched on the
50-pin back plane connector.
with DIDU2
w/o DIDU2 with DIDU2
DIDU2