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Ethernet Base Module and Interface ModulesPassport 4400 Hardware Installation Manual
5-6
ISDN Interface Module
The ISDN (integrated services digital network) basic rate interface (BRI) plug-in
module will be used as a primary network link connection to the WAN or for
backup in case of failure. ISDN interface modules may be placed in both Port 2
(MPANL port) and Port 3 (WAN backup port).
There are two types of ISDN interface module, one supporting an ISDN S/T
interface, and the other supporting an ISDN U interface. Both are accessed via
an RJ-45 connector.
The data frame of the ISDN interface consists of three data channels (D, B1, and
B2). The D-channel is used to exchange control information between the user and
the network, as well as transferring data, at a data rate of 16 kbps. Channels B1
and B2 are used to transfer data at the rate of 64 kbps.
ISDN U Interface Module
Figure 5-9. Front and Back View of ISDN U Interface Module
Figure 5-10. ISDN U Interface Module Connector
Note: The interface module must be inserted into the
unit with the component side facing down.
Rear View
ISDN U
Pin 1
RJ45
RJ45 Pin Assignments
1
2
4
5
6
7
8
3
Tip of pair to Network
Tip of pair to Network
Pins 1, 2, 3, 6, 7, 8 Not Connected