Enterasys Networks Security Router X-PeditionTM - Manual (Page 274)

ISDN Configuration
11-10 Configuring Integrated Services Digital Network
• The channel-group command for point-to-point connections.
The above commands are mutually exclusive: you can enter one or the other per PRI interface, not
both. On the E1 NIM, 30 channels are controlled by ISDN, and 23 channels on the T1 NIM. Other
PRI commands include:
• bchan-number-order selects a channel from B1 (ascending) or B23/B32 (descending).
• calling-number configures an outgoing ISDN calling number.
• switch-type specifies the Central Office ISDN switch type.
BRI interfaces utilize a BRI-S/T or UNIM card. From a software perspective, S/T and U cards are
equivalent and all features supported on both cards are equivalent. The card type is significant
during installation only. In North America, the U card is connected directly to the ISDN service
jack, the S/T card requires an external NT1 device to be connected between the S/T card and the
service jack. Outside North America, only the S/T card is used with very few exceptions.
The two basic modes of operation of the BRI card are: CMD switched mode and leased line
(permanent) mode. Leased line mode is configured similar to T1/E1 channelized operation mode
- commands are entered at Controller configuration mode. BRI ISDN commands include:
• answer1/2 adds a called number:subaddress to be screened.
• calling-number adds a calling number included in outgoing calls.
• spid1/2 sets a Service Profile ID string calling-number: subaddress.
• switch-type selects the interface ISDN switch type.
• leased-line sets a BRI interface to support leased lines.
BRI (Switched) Configuration Model
Figure 11-1 , shown below, illustrates how Dialer and BRI interfaces are configured on the XSR’s
BRI NIM card (XSR 1800/3000 Series) as well as how those interfaces correlate to dialer and access
lists, map classes, and dialer pools