Carrier Access Broadmore 1750 - Manual (Page 91)

Broadmore 1750 - Release 4.6 5-9
Module and Fan Installation
NIM Installation
NIM Installation
1. If a Building Integrated Timing Supply (BITS) clock will be used, an
impedance matching adjustment may be required before installing an OC-12
NIMs. BITS impedance matching jumpers are located on the NIM component
side below the midplane connectors. They are labeled JMP1, JMP2, JMP3,
and JMP4. The following settings are available.
JMP3, JMP4 in (default) 100 ohms
JMP1, JMP2, JMP3, JMP4 in 75 ohms
All jumpers out No termination
BITS input is provided to the RJ48C BITS connector on the corresponding
NIM IOM (see “BITS Interface Connections” on page
6-7 ).
NOTE: OC-12 NIMs go in slots A and B. (Both optical NIMs must be
identical.) The NIM in slot B is the Working unit and the NIM in slot A is the
Protection unit.
2. Place the Working NIM in slot B from the front so that it slides smoothly in the
top and bottom card guides and the card connector aligns with the midplane
connector.
3. Firmly press the NIM into the chassis until the connectors seat against each
other completely. Use pressure simultaneously at the top and bottom of the
NIM to ensure a proper fit to the midplane.
4. Secure the screws on the top and bottom of the module, being careful not to
over-tighten.
5. For redundant NIMs, repeat this process to install the Protection NIM in slot A.