Installing A Did Choke; Did Choke (Figure 3-8); Did Choke Installation - NEC Aspire S Manual

INSTALLING A DID CHOKE

DID Choke (Figure 3-8)

If your central office has a high level of AC noise or if your site is experiencing excessive hum on the DID
lines, a customer-provided isolation transformer can be installed between the Aspire S and telco blocks to
help to suppress the hum.
DID trunks must be bridged from the telco RJ21X to a line cross-connect (A) block. The choke is installed
between these two blocks.

DID Choke Installation:

1. Remove the bridging
clips on the (A)
block and telco
block for the DID
lines.
2. From the telco
block, solder the Tip
lead to the "3" con-
nector on the choke.
3. From the telco
block, take the Ring
lead and solder it to
the "1" connector on
the choke.
4. From the (A) block,
take the Tip 1 lead
and solder it to the
"4" connector on the
choke.
5. Solder the Ring 1
lead from the (A)
block to the "2" con-
nector on the choke.
6. Reinstall the bridg-
ing clips as required.
Aspire S Hardware Manual
Section 3: Installing Extensions and Trunks
Telco
RJ21X
2 DID
Trunks
2 DID
Trunks
Figure 3-8: DID CHOKE INSTALLATION
Section 3: Installing Extensions and Trunks ◆ 3-13
T T1
One-Pair
Line
Xconnect
"A" Block
DID Trunks
1-2
Not used
R R1
DID Trunks
3-4
Not used
Bridging Clips
DIOPU PCB
3
25-Pair
Cable