363-206-204
Powering, Verification, and Circuit Pack Installation
Issue 9 October 1998
4-9
Transmission and Timing Circuit Packs
BBG2 (MXRVO) Circuit Pack
The BBG2 circuit packs are required if the low-speed slots in the same function
group are to be equipped with BBF1B (DS1) or BBF3 (DS1PM) circuit packs.
1. The BBG2 circuit pack has no customer set options.
2. Place, but do not fully install, the BBG2 circuit pack(s) into the shelf.
BBG4 (DS3) or BBF4B (DS3PM) Circuit Pack
The BBG4 (DS3) or BBF4B (DS3PM) circuit pack is used when the low speed
input is to be a DS3 signal. The low speed DS1 slots in the same function group
will be unequipped when a BBG4 circuit pack is used.
The BBG4 or BBG4B circuit pack has two option jumpers for line build out (LBO).
1. Set the BBG4 or BBG4B circuit pack option jumpers (for distance to the
DSX) as shown in Figure 4-10.
2. Place, but do not fully install, the circuit pack(s) into the shelf.
BBG19 (DS3) Circuit Pack
The BBG19 circuit pack has the input and output connections on the faceplate
rather than on the backplane. There are two versions of the BBG19. The s1:1
BBG19 is a modified BBG4B on which the DS3 input and output connections are
brought to the front of the pack via coaxial cables. The s1:2 BBG19 has a
redesigned printed wiring board on which the DS3 input and output are brought to
the faceplate through the printed wiring board. Refer to the BBG4B description for
further information. Circuit pack option jumpers are shown in Figure 4-10 and are
identical to those for the BBG4B.
BBG20 (Transmultiplexer) Circuit Pack
The new TMUX circuit pack (BBG20) provides path termination functions for an
M13 or C-bit parity DS3 signal. It demultiplexes the DS3 into 28 DS1s, performs
DS1 PM, maps each DS1 into a VT1.5, and multiplexes the 28 VT1.5s into an
STS-1.The BBG20 circuit pack has LBO jumpers to set the level and shape of
signal for the DSX-3.
1. Set the jumper for the cable length to be used as shown in Figure 4-11.
2. Place, but do not insert into the shelf connector [fully install], the BBG20
circuit pack into the shelf.
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