Vanguard Managed Solutions 3400 Series ユーザーズマニュアル

Hardware Description 

2-7

Older Vanguard Networks Daughtercards do not fit into the Vanguard 3400 Series. 

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.

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.

The 56K 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 2-7 shows the 56K DSU/CSU Daughtercard connector as it appears on the 

back panel.

Dimple