
SIP User's Manual 2. Physical Description
Version 5.0 31 October 2006
2.2.2 Rear Transition Module
The RTM includes PSTN trunks, an Ethernet interface, and an optional RS-232 connector
(available only on the 1, 2 and 4-span configuration).
The Ethernet interface features dual 10/100 Base-TX, RJ-45 shielded connectors for (an
active / standby) redundancy scheme providing protection against the event of a failure.
The PSTN interface is available in 1-span, 2-span, 4-span, 8-span, or 16-span rear panels.
Rear panel with two 50-pin female Telco connectors (DDK 57AE-40500-21D) (shown in
Figure
2-3) is required for a gateway equipped with 16 E1/T1 spans. Rear panel with RJ-
48c connectors (shown in Figure
2-4) is required for a gateway equipped with 1, 2, 4, or 8
E1/T1 spans. The physical difference between the 1-Span, 2-Span and 4-Span RTMs, and
the 8-span RTM is that the RJ-48c ports are depopulated correspondingly.
Figure 2-3: Rear Panel with two 50-pin Connectors for 16 Trunks
Table 2-8: Rear Panel with two 50-pin Connectors for 16 Trunks Component Descriptions
Item # Label Component Description
1
ETHERNET
2 Ethernet Ports. 2 RJ-45 network connectors.
2
TRUNKS
E1/T1 trunks 9 to 16. 50-pin female Telco connector.
3
TRUNKS
E1/T1 trunks 1 to 8. 50-pin female Telco connector.
Figure 2-4: Rear Panel with 8 RJ-48c Connectors for 8 Trunks
Table 2-9: Rear Panel with 8 RJ-48c Connectors for 8 Trunks Component Descriptions
Item # Label Component Description
1
ETHERNET
2 Ethernet Ports. 2 RJ-45 network connectors
2
TRUNKS
8 E1/T-1 Spans. 8 RJ-48c trunk connectors
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