NEC UX5000 - Installing a DID Choke; DID Choke (Figure 3-11)

Chapter 3 - Installing Extensions and Trunks
Chapter 3 3 - 17
SECTION 3-11
INSTALLING A DID CHOKE
3.11.1 DID Choke (Figure 3-11)
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 UX5000 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:
Figure 3-11: DID CHOKE INSTALLATION