Figure 2. We4W, We6W, We8W And We8K Modular Polarization; Figure 3. Mmj Polarization - IBM 8265 Site Preparation Manual

Standards Used With Modular Wiring Connectors
50-Position to Modular Wiring
The 50-position to modular pin wiring in such components as the Harmonica,
Octopus, and Mod Patch Panel is called the sequence. There are seven standard
sequences: USOC, MMJ, 258A, 356A, 10BASE-T, EIA and OPEN DECconnect.
USOC:
This is the original US voice communications industry standard. Most voice
equipment is compatible with this sequence. Available in WE4W, WE6W, WE8W,
and WE8K modular polarization of four, six and eight wire channels.
1 2 3 4
T3
R4 T2 R1
1 2 3 4
T2
T3 R1 T1

Figure 2. WE4W, WE6W, WE8W and WE8K Modular Polarization

MMJ:
This is an adaptation of USOC especially suited to asynchronous EIA-232 and EIA-
423 interface data equipment. Available in MMJ polarization, four and six wire
channels.
1 2 3 4
T3 T1 R1 R2

Figure 3. MMJ Polarization

5 6 7 8
R3
T1 R2 T4
5 6
R2 R3
5 6
T2 R3
1 2 3 4
R1
T2 T1 R2
Chapter 3. Cabling Recommendations
19