Polycom DOC2558C - Manual (Page 20)

Chapter 1- Hardware Description
1-14
RTM ISDN
The RTM ISDN card connects directly to an MPM/MPM+/MPMx. The
RTM ISDN card routes data between the MPM/MPM+/MPMx cards and
components of the system, converts ISDN T1/E1 media to IP packets and
provides connectivity to external ISDN networks.
The RTM ISDN card is installed on the rear panel of the RMX interfaces
between the RMX unit and the ISDN/PSTN switch. In an RMX with a
single MPM/MPM+/MPMx card – the RTM ISDN card must be installed
in the rear panel slot on the same level as the MPM/MPM+/MPMx card.
In an RMX with two MPM/MPM+/MPMx cards – the RTM ISDN card
can be installed in either of the two rear panel card slots.
Up to two RTM ISDN cards can be installed in one RMX 2000. Up to a
total of 14 E1 or 18 T1 PRI cables can be installed with two MPM/MPM+/
MPMx and RTM ISDN cards.
Each RTM ISDN card includes the following connections:
•
7 E1 or 9 T1 PRI lines that can be plugged into any of the 12
connections as shown in Figure 1-3.
• 1 LAN port
Figure 1-3 RMX 2000 RTM ISDN Rear Panel Layout
E1 and T1 spans cannot nbe connected simultanously to the same card,
therefore, it is not possible to have a mixed E1 and T1 ISDN Network Service.
LAN & LEDs E1/T1 connections & LEDs
H/S LED
The RTM ISDN card supports 200 audio participants, regardless of whether the
spans are E1 or T1.