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2-12 Hardware Description
Vanguard Daughtercards
If you have an older Vanguard Daughtercard and would like to use it in a Vanguard
6435/6455, contact your service representative about having the card reworked.
DIM Daughtercard 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 2-10 shows the DIM Daughtercard connector as it appears on the back panel.
Figure 2-10. DIM Daughtercard Connector
56 K DSU/CSU
Daughtercard
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 loopback
• 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 2-11 shows the 56K DSU/CSU Daughtercard connector as it appears on the
back panel.
Figure 2-11. 56K DSU/CSU Daughtercard Connector
ISDN BRI-U
Daughtercard
This card provides 2B+D Channel through an ISDN BRI U interface. It conforms to
ANSI T1.601 1992 (2B1Q), is LAPD:ITU Q.921 compliant, and supports the
following:
• Integral X.31
• Q.931 dial support
• NI1, 5ESS, DMS-100 switch types
• D Channel Packet Mode
• Leased Circuit Services (I Interface)
• Japan High-Speed Digital
Figure 2-12 shows the ISDN BRI-U Daughtercard connector as it appears on the
back panel.
DIM SITE
DSU