Patton electronic 2800 user manual Rear panel of 2803K/EUI

OnSite 2800 Series User Manual 2 • Hardware installation

The signal pin-outs for the Model 2821 X.21 interface are shown in table 6.

Table 7. Signal pin-outs for the X.21 interface on the OnSite 2800

Pin	Signal	Pin	Signal
1	Frame Ground	8	Signal Ground
2	TXDa	9	TXDb
3	CNTa	10	CNTb
4	RXDa	11	RXDb
5	INDa	12	INDb
6	SETa	13	SETb

The the router’s X.21 interface is wired as a DCE. No DTE configuration is possible. The router’s X.21 inter- face requires a cable with a male DB-15 connector. Attach the male DB-15 connector of the X.21 cable to the female DB-15 connector on the router. Attach the other end of the cable to the X.21 connector on local modem or multiplexer device.

Installing the T1/E1 twisted pair cables. The PRI is usually connected to a PBX or switch (local exchange (LE)). Type and pin-outs of these devices vary depending on the manufacturer. In most cases, a straight- through RJ-48C to RJ-48C can be used to connect to the PRI (see for E1 RJ-48C pin-out listing) with a PBX. A cross-over cable is required to connect to an NT1, as illustrated in .

Table 8. RJ-48C receptacle

Pin	Signal
1	TX tip
2	TX ring
3	TX shield
4	RX tip
5	RX ring
6	RX shield

Figure 4. Rear panel of 2803K/EUI

Figure 5. Rear panel of 2803T/EUI

Installing the VPN router 34