Vanguard Managed Solutions 3400 Series manual Daughtercard, Compatibility

			Vanguard Networks Daughtercards
Daughtercard
	Older Vanguard Networks Daughtercards do not fit into the Vanguard 3400 Series.
Compatibility	You can only use the newer daughtercards which are identified by a dimple as shown
	in Figure 2-5. If the dimple is not present, do not attempt to use the Daughtercard in
	the Vanguard 3400 Series.
	Also, when installing a Vanguard Networks Daughtercard into a 3400 Series, you
	must use the shorter two-sided header. The taller header is used with other Vanguard
	Networks units.
		Dimple
		DSU
	Figure 2-6. New Vanguard 3400 Series Daughtercard Example
	Caution
	If you attempt to force an older Vanguard Networks Daughtercard into a Vanguard
	3400 Series, the equipment will be damaged.
	If you have an older Vanguard Networks Daughtercard and would like to use it in a
	Vanguard 3400 Series, contact your service representative about having the card
	reworked.
56K DSU/CSU
	The 56K DSU Daughtercard provides an RJ48S connector and can support speeds of
Daughtercard	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 2-7shows the 56K DSU/CSU Daughtercard connector as it appears on the back panel.

DSU

Figure 2-7. 56K DSU/CSU Daughtercard Connector

Hardware Description 2-7