Telos Zephyr Xstream User Manual
Page 58
USER’S MANUAL
Section 3: GUIDED TOUR of the HARDWARE 46
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HOT TIP!
Normally, the Telephone Company should supply an RJ-11 style jack for the U interface. This
is the same 4 or 6-pin plug used for analog lines. However, sometimes you may find an 8-pin
RJ-45 style jack–and sometimes you may even be charged extra for it! If you have this
situation, an RJ-11 plug can be inserted into the center of an RJ-45 jack to make things work.
If you discover that the Telco charged you extra, be sure to request a refund!
S Interface (4 wire) for use worldwide
The S interface is a 8‐position/8‐pin miniature modular jack (RJ‐45 style) and is supplied for use
outside of North America (where the NT1 will be provided by the Telco). It can also be used for
special applications where the Zephyr Xstream’s built‐in NT1 is shared between it and another
ISDN device, such as an ISDN telephone.
PIN
FUNCTION
1
No Connection
2 No
Connection
3
S Transmit to network +
4
S Receive from network +
5
S Receive from network -
6
S Transmit to network -
7
*PS2 Power (-48 VDC)
8
*PS2 Power ground (+) (Top)
*Available only on early production units
The S interface is a standard modular RJ-45 style jack with the
pin-out shown above.
Early rev units have PS2 power source (48 volts DC) provided on Pins 7 & 8 to power external
equipment on the S interface. Those units were shipped with PS2 power disabled. To enable ‐48
see Section 13 (Deep Tech Info) for details and for important safety warnings.
S