Interleaving is a method of protecting the data transmitted from burst errors, with interleaving enabled should an error occur the idea is that enough error control bits can piece back enough of the transmission to retain the information from corruption.
Original transmitted: ThisIsAnExampleOfInterleaving
Received after burst without Interleaving: ThisIs______pleOfInterleaving
Received after burst with Interleaving: T_isI_AnE_amp_eOfInterle_vin_
The disadvantage of enabling Interleaving is the increase of latency, and so ping response times will be higher with page load taking longer.
ISDN service types
The Integrated Services Digital Network (ISDN) prescribes two levels of service:
Basic Rate Interface (BRI): two 64-kbit/s B channels and one 16-kbit/s D channel, intended for small enterprises and residential service.
Primary Rate Interface (PRI) for large organizations, with one 64-kbit/s D channel and 23 (1.536 Mbit/s T1, a.k.a. "23B + D") or 30, 64-kbit/s B channels (2.048 Mbit/s E1, a.k.a. "30B + 2D").
Each B-channel carries data, voice, and other services. The D-channel carries control and signaling information. Larger connections are possible using PRI pairing. A dual T1-PRI could have 24 + 23 = 47 B-channels and 1 D-channel (often called "47B + D"), but more commonly has 46 B-channels and 2 D-channels thus providing a backup signaling channel. The concept applies to E1s as well and both can include more than 2 PRIs. When configuring multiple T1’s as ISDN-PRI’s, it’s possible to use NFAS (non-facility associated signalling) to enable one or two D-channels to support additional B-channels on separate T1 circuits.