Avaya S8700 Manual page 57

Y Cable Lengths
.
Table 11: Y Cable Lengths
Length
14 in. (35.6 cm)
70 in. (178 cm)
14 in. (35.6 cm)
Installing a 75-ohm E1 Interface Adapter
For certain markets with 75-ohm E1 service, the TN1654 DS1 converter requires an adapter to convert
the 120 ohms to 75 ohms. See
DS1 Converter Connections for E1 75-ohm Service — Part 2
Adding New Hardware--S8700
November 2003
on page 57 shows the Y cable lengths.
Description
TN1654 circuit pack to adjacent EI circuit pack or
TN573B SNI circuit pack in same carrier
TN1654 circuit pack to EI circuit pack or SNI circuit
pack in another carrier
TN1654 circuit pack to fiber optic transceiver (DC-
powered cabinets only). This cable is for intercabinet
cabling only.
NOTE:
The distinction between facility types is important when using TN1654 circuit packs. The
facility used to carry control channel messages between the pair of DS1 converter circuit
packs and all packet traffic is known as the primary facility. The facility used to backup
and takeover for the primary facility in the event of primary facility failure is known as the
secondary facility. The TN1654 allows either facility, A or B, to be a primary channel. The
control channel is restricted to only the A or B facilities. This permits full 24-channel
access (T1) or 31-channel access (E1) for facilities C and D to support user traffic.
127A BALUN Coaxial Adapter
NOTE:
Although the TN1654 DS1 converter supports 75 ohms, use the 127A BALUN to convert
the 120 ohms to 75 ohms rather than the switch settings.
on page 58.
on page 59 shows a typical connection.
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