Installing the Components
7705 SAR-8 Installation Guide Page 113
Step 4. Securely attach the shield to the chassis ground point. Use a screw and star washer
large enough to make a proper ground connection. Use proper cable dressing and
strain relief techniques.
Wire Identification by Color
Within the T1/E1 cable, there are two cables: Transmit (Tx) and Receive (Rx). For 28 AWG,
each Tx and Rx cable consists of 16 twisted pairs. For 26 AWG, each Tx and Rx cable
consists of unique “quads”, which are groupings of four wires.
To identify quads for the 26 AWG open-ended wire T1/E1 cable by color:
Step 1. Identify the Transmit (Tx) and Receive (Rx) cables. The Transmit cable is labeled
“TX”, and the Receive cable is labeled “RX”.
Step 2. For each Tx and Rx cable, strip the end of the outer jacket of the cable. Note that the
wires are twisted in groups of four (quads), each quad containing one white wire, one
turquoise wire, one violet wire, and one uniquely colored wire. The uniquely colored
wire identifies the quad number, and the same color is used for both the Tx and the
Rx cables. See Table 26 for quad identification wire colors.
Step 3. For each Tx and Rx cable, after identifying the quads by color, label the quads as
Transmit 1 to 8 and Receive 1 to 8. Perform this step before untwisting the wires.
Note:
• To maintain signal integrity, wires should not be untwisted more than 0.5 in (13 mm).
Table 26: Quad Identification Wire Color
Quad Number Unique Wire Color Identified
1Blue ❑
2Orange ❑
3 Green ❑
4Brown ❑
5Gray ❑
6Red ❑
7Black ❑
8Yellow ❑
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