12 Aug
2002
12 Aug
'02
1:56 p.m.
A telco switch engineer privately told me the following. On Thu, 8 Aug 2002, Andy wrote:
56K-Only ISDN =============
The industry calls this "Fractional PRI". Customers can use 'digital switch service' to set this up on their end, although he doesn't know any customer that has done it.
D-Channel ISDN ==============
Last he heard, this standard failed because the D-Channel control information (although very very small) was not protected in the protocol. If the IP data caused a single control token to error out, the connection drops. He is unaware if this was eventually solved. I look forward to any extra insight on these two ISDN layouts. ---