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2-12 Hardware Description
Vanguard Daughtercards
Note
If you are only using one ISDN or enhanced ISDN BRI daughtercard, the card
must be located in the Port 1 position. If you are using Release 6.3 and greater,
the enhanced ISDN BRI ST data daughtercard must be located in port 1 and the
ISDN BRI voice card would go in port 2. For more information refer to Chapter
Five of the Daughtercard Installation Guide (Part Number T0020).
DSU The DSU Daughtercard provides an RJ48S connector and can support speeds of
56 kbps (synchronous). It conforms to AT&T 62310 point-to-point and multipoint,
and to ANSI T1/E1.4/91-006 56 kbps. The card supports the following capabilities:
• Internal/external clocking
• Internal/external loop back
• 4-wire line driver operation
The card also supports multidrop DSUs when either of these conditions exist:
• If a MARK Idle protocol is used (such as MX25).
• If the Telco uses an OR’ed or Data Contention is used to mix individual DRU
drops.
Figure 2-14 shows the 56K DSU Daughtercard connector as it appears on the back
panel.
Figure 2-14. DSU Daughtercard Connector
DIM This card supports a single V.11, V.24, V.35, or V.36 DIM (Digital Interface Module)
and can be set as either a DTE or DCE.
Figure 2-15 shows the DIM Daughtercard connector as it appears on the back panel.
Figure 2-15. DIM Daughtercard Connector
DSU
DIM SITE