ADTRAN manual Install DS1, Connect S25 to Another On Premises PBX

INSTALLATION

Install DS1

DS1 signaling allows a digital connection between the System 25 and other PBXs, Central Offices, Toll Offices, off premise stations, and data end points such as host computers. The TN767 emulates ground start, Ioopstart, tie and DID Trunks in addition to off premises stations. The ZTN131 circuit pack provides the required digital synchronization.The TN748 circuit pack will provide the Touch Tone registers.

The term synchronization refers to an arrangement where by digital facilities operate from a common clock. This allows the receiving facilities to keep the digital signals in step or synchronized. Synchronization can be provided by the system 25 any other PBX it is connected to, or by the CO being used by the network, Synchronization must be properly engineered before installation is begun. Each node must be aware of the synchronization plan so that it may be properly administered.

The TN767 circuit pack generates a signal that is shaped in a manner that when it reaches the cable it conforms to power specifications. The level of the signal must be adjusted according to the cable distance. If the DS1 Interface terminates at the cross connect field or at a CSU, the total cabling distance must be used. If the DS1 Interface terminates on another PBX (direct connection), a phantom point midway between the two PBXs should be used as the reference point. The line equalization/compensation for S25 is set via administration procedures from the SAT.

Connect S25 to Another On Premises PBX

When the S25 and the other PBX are in the same building, the cabling is broken down into three different distance ranges. The first connection is for distances of 1310 feet or less. The second distance range is 1311 to 4310 feet which requires the use of a Customer Service Unit (CSU) equipped with an Office Repeater. The third distance range is greater than 4311 feet. It uses a CSU and T1 line repeaters as required.

Direct Connection—Less Than 1310 Feet

Figures 2-19and 2-20show two different direct connections. Figure 2-19is normally used for connecting a S25 to another PBX that is virtually side by side.

Figure 2-20is used for direct connections that involve more distance. Figure 2-20shows two S25s but a DEFINITY G1 or G2, System 75, or System 85 can be connected directly to the S25. Consult the System 85 installation manual (555-103-104) or the DEFINITY G1 Wiring Guide (555-204-111) or the System 75 Wiring Guide (555-200-111) for the connection information for those PBXs.

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