User Manual

Architecture
Nortel Networks Confidential
3–30
PE/DCL/DD/0063
411–9001–063
Standard 12.07/EN September 2000
GSM/BSS V12
HDSL A–bis interface
The HDSL–E1 format (2B1Q) is on one single twisted copper pair where the
transmission rate is 2320 kbps for a full E1 frame. This rate is compatible with the
ETSI ETR 152 RTR/TM–06002 standard.
The HDSL–T1 format (2B1Q) is on one single twisted copper pair where the
transmission rate is 1552 kbps for a full T1 frame. This rate is not standardized and
is considered a proprietary link.
Private PCMs
One CPCMI board is connected to two Private PCM links (PCM0 and PCM1). The
O&M communication is done through an HDLC link using TS0 of PCM0.
E1/T1
Three bits supplied to the CMCF indicate whether the board is an E1 or T1.