Prosody compact PCI installation guide
24
If a cable is to be produced to wire into a network trunk connection, the connector on the
network end of the cable must be wired as appropriate for the network-terminating unit
provided.
A 'cross-over' cable is required to connect two E1 cards 'back-to-back', for example, when one
card is to run an exchange end emulation and the other card a user end application. The cable
should be wired as follows.
User End
Exchange End
4 to
1
5 to
2
1 to
4
2 to
5
Network connection via other apparatus
If other apparatus, including cable or wiring, is to be connected between the E1 card and the
point of connection to the network, then all of that apparatus must comply with the following:
The overall transmission characteristic of all the other apparatus, upon electrical conditions
presented to one another by the apparatus and the network connection, shall be such as to
introduce degradation no greater than the requirement for direct connection. The attenuation
shall be assumed to follow the
√
f law, and the loss at a frequency of 1024KHz shall not exceed
6dB.
All that other apparatus shall comprise only apparatus approved for the purpose of connection
between the apparatus and the network. Cable, wire and wiring accessories shall comply with
Approval No: NS/G/1235/M/100009 Section 22, Telecommunications Act 1984 Approval of
cable, wire and wiring accessories for connection between certain digital telecommunication
apparatus, published by OFTEL.
The installation should comply with the Wiring Code Part 2, published by OFTEL.
The MEF watchdog
Once running, the DASS-2 port processors enable an internal 'watchdog' timer that they must
persistently and regularly update. Any error condition that causes processing to falter will cause
the watchdog to generate a processor reset. This is the 'Major Equipment Failure' (MEF)
condition, and will result in a 'no signal' being presented at the particular G703 output port,
which is the required behaviour under these conditions.
Service Requirements
In case of equipment malfunction, all repairs should be carried out by Aculab plc. It is the
responsibility of users requiring service to report the need for service to our company.
Service can be obtained at:
Aculab Plc
Lakeside, Bramley Road
Mount Farm, Milton Keynes
MK1 1PT, England
UK
Phone : +44 1908 273800
Fax : +44 1908 273801
E-mail :
