Vsp3 Cable Assemblies - Nortel Passport 15000 Hardware Description

276 Chapter 4 Control and function processors

VSP3 cable assemblies

241-1501-200 5.2S2
The VSP3 can receive signals over the backplane from an ATM interfacing
card in the same shelf, or directly through the gigE ports. Signals can arrive
on the TDM port on the TDM card in the same shelf as the VSP3, and leave
through the gigE ports. The VSP3 always needs a TDM card and a packet port
(such as the gigE ports) in the same shelf.
The gigE ports are used with the PVG base voice-over-IP features (for
example, vgslpGigE and vgslpG729GigE). When both VSP3 gigabit ports are
cabled, all IP packets pass through the ports, including voice, call server
protocol, primary rate interface (PRI) using Q.921, and V5.2 backhaul
signaling.
With the NTHW84 card, use duplex multimode (MM) fiber cable with duplex
LC small-form connectors at the FP end and any other fiber connector at the
other end.
The VSP3 card has two gigabit Ethernet ports on the faceplate. One port is the
standby of the other. For an example, see the figure "An example duplex LC-
to-LC cable assembly" (page 277). You must custom make each cable
assembly according to the specifications in "Cable specifications for custom-
making an LC cable assembly" (page 276).
The sum of cable losses and connector losses from the FP to the far end
termination must not exceed 7.5 dB for MM cable. The losses in a
transmission path determine the distance the FP can send a signal. The signal
distance with the gigabit Ethernet ports is described in "Cable specifications
for custom-making an LC cable assembly" (page 276).
Cable specifications for custom-making an LC cable assembly
Make an LC cable assembly for an NTHW84 card using the following
specifications
• mutlimode (MM) fiber
• duplex fiber cables (recommended to faciliate lesser cable densities) with
colour-coded halves
• a core diameter of 50 microns or 62.5 microns
• a cladding diameter of 125 microns (the same for either core diameter)