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Configuring E1 and T1 Services

117345-B Rev. 00

6-5

B8ZS substitutes a bipolar violation into a string of eight consecutive zeros at the

transmitting end, and removes the bipolar violation at the receiving end. In a

bipolar violation, the first pulse is in the same direction (positive or negative) as

the previous pulse (Figure 6-3)

Figure 6-3. Bipolar with 8 Zero Substitution (B8ZS)

You can enable or disable B8ZS support on this interface, depending on whether

the associated T1 equipment supports B8ZS.

See the B8ZS Support parameter on page A-75

for information.

Specifying Line Buildout

Line buildout conditions the router signals to mitigate attenuation. Line buildout

depends on the physical length of the T1 line. The carrier determines line buildout

for DS1 (long-haul). DSX-1 (short-haul) line buildout corresponds to the cable

length.

Line voltage

Data

11 100000

0000

Substituted byte

Binary polar

violation

LS0010A

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 293 294

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