December 22, 1997
Section 150-219-100-02
HDU-217/219 and
HCC-239 List
1
Page 13
Installing and Removing the Cut-Through Card
When the dual-slot
HDU-219
is inserted into a T1 enclosure, it blocks
access to the adjacent slot. In order to cut through the IN (CO side)
pairs to the OUT (field side) pairs of the blocked repeater slot for
downstream access, a HCC-239 (HiGain Cut-through Card) is
included with all
HDU-219
List 1 doubler units shipped with the
Revision 02 practice. A block diagram of the HCC-239 is shown in
Figure 3. A special insertion tool (Figure 4), the HCT-239 (PairGain
part number 150-1595-01), that simplifies the HCC-239 installation
may be purchased from PairGain.
A package of 25 HCC-239 cut-through cards (PairGain
part number 150-1550-01) is also available if this cut-
through feature is needed in other doubler
installations.
To install the HCC-239 use the HCT-239 insertion tool (or long-nosed
pliers):
1
Loosen the wing nut on the HCT-239 insertion tool.
2
Slide the non-connector edge of the card into the tapered edge of
the insertion tool.
The HCC-239 card is symmetric, so the orientation is
irrelevant and the card cannot be plugged in
backward.
3
Tighten the wing nut to firmly grip the card.
4
Hold the tool near the end, and insert the card into the blocked
slot cavity.
5
Carefully align the edge of the card with the slot edge connector.
6
Push the card into the connector until it is firmly seated.
7
Loosen the wing nut and remove the tool.
