Phil,
I'm not a Cisco man... yet.. just starting on CCDA study.. but the terms balanced and unbalanced are transmission terms and refer to how the impedance on each leg of the circuit is distributed. ie evenly on each (balanced) or unevenly (unbalanced). The reason for balancing impedances on each leg is to minimise the induced noise voltage on copper pairs which otherwise can result. Consequently , balance TX lines are used where cable distances are longer and noise interference is possible... typically by Telco's in copper situations. Optical systems have largely made this issue obsolete.
The real answer is to check with your leased line supplierand see what they are offering at their interface.
Best Regards,
Mike Higgins
Consulting Telecommunications Engineer
email: [EMAIL PROTECTED]
-----Original Message-----
From: Phil Barker [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, 28 June 2000 15:04
To: cisco GroupStudy
Subject: ISDN Balanced v Unbalanced ? UK E1
Hi folks,
Just inherited another disaster waiting to
happen.
Just been using Config Maker at cisco.com to spec up
the following.
2 x 3620, 2 x serial & 1E(LAN) for leased circuit,
ISDN for backup.
I've picked out the NM-1E2W card with the idea that
the least circuit can be future-proofed to 4Mb/s,
hopefully this is correct.
Main Problem : I'm looking at the ISDN PRI backup
solution, 1 port only and I don't understand the
difference between Balanced and Unbalanced apart from
the fact that the cables have a different Resistance
i.e 75 v 120.
I would be very grateful for any assistance.
Thanx,
Phil.
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