Verilink PRISM 3001 (34-00186) Product Manual - Manual (Page 27)

NET/External Clock Connection 2-13
An alternate method of connecting the network is through the Network /External
Clock contacts provided on the rear of the unit. Refer to NET /External Clock
Connection below.
Disconnection
Notice:
In accordance with FCC Rules, Part 68.218(b), the telephone company must be
notified before disconnecting the CSU/DSU.
NET/External
Clock
Connection Contacts are provided on the rear of the stand-alone unit to permit connection to an
external timing source (using pins 1 and 2). An alternate method for network connection
is also provided with pins 3-6. Connection information is shown in Table 2-14.
The station clock input on the standard 3001 unit is designed to accept TTL or
bipolar signal levels. The station clock is commonly available as a 64 kHz, bipolar
RTZ signal referred to as a composite clock. The unit, however, also accepts any
unframed all ones bipolar RTZ signal with a level of 1.5 to 4 volts peak and a
frequency of 1.544 MHz or any multiple of 56 or 64 kHz. An RS422/423-
compatible station clock input, with the same range of input frequencies, is also
available as a special option.
Contacts are also provided on the rear of the 12-slot chassis unit to permit connection
to an external timing source (using TB1, pins 1 and 2). The station timing is configured
through the Terminal Interface. Refer to Line Parameters on page 4-15.
Alarm
Connection The stand -alone unit and the chassis modular unit provide rear panel alarm relay
contacts. These dry (isolated) alarm contacts permit connection to a remote
indicating device.
Stand-alone
Unit
The connection for the stand-alone unit is made on pins 5 and 6 of the
Alarm/Power connector as shown in Table 2-15.
Table 2-14 NET/External Clock Pinout
Pin External Clock Connection
1 Network Input (Tip)
2 Network Input (Ring)
3 Network Output (Tip)
4 Network Output (Ring)
5 Station Clock (Ring)
6 Station Clock (Tip)
Table 2-15 Alarm/Power Connection
Pin Function
1 48 VDC Return
2 Signal Ground
3 -48 VDC
4 Frame Ground
5 Alarm Contact
6 Alarm Common