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RealPresence Collaboration Server (RMX) 1500/2000/4000 Administrator’s Guide
21-22 Polycom, Inc.
The following diagram displays the RealPresence Collaboration Server (RMX) Resource
Report, displaying a resource graph that indicates the number of voice and video ports that
are available or occupied in the MCU.
ISDN/PSTN
The RMX 1500 supports one ISDN card with 4 E1/T1 PRI lines.
On the RMX 2000/4000 a maximum of two RTM ISDN cards are supported, each providing
connection for up to either 7 E1 or 9 T1 PRI lines.
On RMX 1500/2000/4000, E1 and T1 connections cannot be used simultaneously.
Table 21-11 lists the ISDN supported bit rates and their respective participant connection
capacities per RTM ISDN card:
Table 21-11 ISDN – E1/T1 Connection Capacity vs. Bit rate
Bit Rates
(Kbps)
(Bonded)
Number of Participants
per RTM ISDN Card
E1 T1
128 40 40 If the conference bit rate is 128Kbps, participants
connecting at bit rates lower than 128Kbps are
disconnected.
If the conference bit rate is above 128Kbps but does
not match any of the bonded bit rates, participants are
connected at the highest bonded bit rate that is less
than the conference bit rate.
For example: If the conference bit rate is 1024Kbps,
the participant is connected at 768Kbps.
192 40 40
256 40 40
320 40 40
384 34 34
512 25 25
768 17 17
1152 11 11
1472 9 9
1536 8 8
1920 7 6