Specifications

SLTM2 & SLTU2 2-7
Chapter 2 - System Components
SLTM2 & SLTU2
The two-port Single Line Telephone Module (SLTM2) allows standard analog Single Line
Telephone (SLT) devices access to CO Lines, other stations, and most features of the
system through the use of “dial codes”.
The SLTM2 provides interface circuitry for two SLTs. The SLTM2 can be expanded with
the two-port Single Line Telephone Unit (SLTU2) to provide four interface circuits in total.
Each interface is equipped with appropriate speech codec and compression functions, 48
volt DC feed circuit, pulse and DTMF dial signal detection. A ring generator and message
wait source are integrated in the SLTM2.
The SLTM2 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 SLTM2 has:
Rear Panel
Rear PanelRear Panel
Rear Panel
On the rear panel, the SLTM2 has:
Figure 2-4: SLTM2 Front & Rear Panels
Power jack for the AC/DC adapter supplied
with the SLTM2
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 SLT LEDs, one for status of each SLT
Four MSG LEDs, one each for Message
status to each SLT
One SLTU LED, indicating the two-port
expansion unit, SLTU2, is installed
DB-9 RS-232 connector
Reset Switch
Four RJ-11 female connectors, one for each
SLT (shown w/SLTU2 installed)
Ground Lug
50-pin back plane connector. All signals on
RJ-11 connectors are matched on the
50-pin back plane connector.
with SLTU2
S
L
TU2
w/o SLTU2 withSLTU2